198 files changed, 6054 insertions, 4469 deletions

diff --git a/Cargo.lock b/Cargo.lock
index 39f27098a..b1fef2e80 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -107,9 +107,9 @@ checksum = "cf1de2fe8c75bc145a2f577add951f8134889b4795d47466a54a5c846d691693"
 
 [[package]]
 name = "byteorder"
-version = "1.4.2"
+version = "1.4.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ae44d1a3d5a19df61dd0c8beb138458ac2a53a7ac09eba97d55592540004306b"
+checksum = "14c189c53d098945499cdfa7ecc63567cf3886b3332b312a5b4585d8d3a6a610"
 
 [[package]]
 name = "camino"
@@ -168,9 +168,9 @@ checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
 
 [[package]]
 name = "chalk-derive"
-version = "0.59.0"
+version = "0.60.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4b9000fbcb67353dc8973ab9fd136277d321d85b79bd36b8756bb3ae0979a94a"
+checksum = "ab0f74445d4fbeaf0217bc1d23978cc73b95b28e8a738b81894580dd646822d2"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -180,9 +180,9 @@ dependencies = [
 
 [[package]]
 name = "chalk-ir"
-version = "0.59.0"
+version = "0.60.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b23528d61b3557c676eccf508fa0771a38453b379f0b780154eaa7f70afe8dfc"
+checksum = "294b1fc6210a5b3bd06c1d01dda48a581e2cafec80b8d659139ce45456644be2"
 dependencies = [
  "bitflags",
  "chalk-derive",
@@ -191,9 +191,9 @@ dependencies = [
 
 [[package]]
 name = "chalk-recursive"
-version = "0.59.0"
+version = "0.60.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a8bdd37afc666b771de8b4429fe014363d0e74aae5cc26f320f60a3eab34d744"
+checksum = "1b9386936070be4545bfa22b094b7065af79aa2aeaccc945438f1c5ffe74c30a"
 dependencies = [
  "chalk-derive",
  "chalk-ir",
@@ -204,9 +204,9 @@ dependencies = [
 
 [[package]]
 name = "chalk-solve"
-version = "0.59.0"
+version = "0.60.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4182c42ca319cb71c89898ebc3d2671d1fa7d928123b171b66f1797a2000b9c8"
+checksum = "7c12a1ec7e850b50a049f27ef9cf5df3056bbd1acbb3eeb44d024e501a641f3a"
 dependencies = [
  "chalk-derive",
  "chalk-ir",
@@ -232,15 +232,6 @@ dependencies = [
 ]
 
 [[package]]
-name = "cmake"
-version = "0.1.45"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "eb6210b637171dfba4cda12e579ac6dc73f5165ad56133e5d72ef3131f320855"
-dependencies = [
- "cc",
-]
-
-[[package]]
 name = "countme"
 version = "2.0.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -252,6 +243,12 @@ dependencies = [
 ]
 
 [[package]]
+name = "cov-mark"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9ffa3d3e0138386cd4361f63537765cac7ee40698028844635a54495a92f67f3"
+
+[[package]]
 name = "crc32fast"
 version = "1.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -501,6 +498,7 @@ dependencies = [
  "anymap",
  "base_db",
  "cfg",
+ "cov-mark",
  "drop_bomb",
  "either",
  "expect-test",
@@ -526,7 +524,9 @@ name = "hir_expand"
 version = "0.0.0"
 dependencies = [
  "base_db",
+ "cfg",
  "either",
+ "expect-test",
  "la-arena",
  "log",
  "mbe",
@@ -547,6 +547,7 @@ dependencies = [
  "chalk-ir",
  "chalk-recursive",
  "chalk-solve",
+ "cov-mark",
  "ena",
  "expect-test",
  "hir_def",
@@ -581,6 +582,7 @@ name = "ide"
 version = "0.0.0"
 dependencies = [
  "cfg",
+ "cov-mark",
  "either",
  "expect-test",
  "hir",
@@ -607,6 +609,7 @@ dependencies = [
 name = "ide_assists"
 version = "0.0.0"
 dependencies = [
+ "cov-mark",
  "either",
  "expect-test",
  "hir",
@@ -625,6 +628,7 @@ name = "ide_completion"
 version = "0.0.0"
 dependencies = [
  "base_db",
+ "cov-mark",
  "either",
  "expect-test",
  "hir",
@@ -644,6 +648,7 @@ name = "ide_db"
 version = "0.0.0"
 dependencies = [
  "base_db",
+ "cov-mark",
  "either",
  "expect-test",
  "fst",
@@ -664,6 +669,7 @@ dependencies = [
 name = "ide_ssr"
 version = "0.0.0"
 dependencies = [
+ "cov-mark",
  "expect-test",
  "hir",
  "ide_db",
@@ -687,9 +693,9 @@ dependencies = [
 
 [[package]]
 name = "indexmap"
-version = "1.6.1"
+version = "1.6.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4fb1fa934250de4de8aef298d81c729a7d33d8c239daa3a7575e6b92bfc7313b"
+checksum = "824845a0bf897a9042383849b02c1bc219c2383772efcd5c6f9766fa4b81aef3"
 dependencies = [
  "autocfg",
  "hashbrown",
@@ -805,11 +811,11 @@ dependencies = [
 
 [[package]]
 name = "libmimalloc-sys"
-version = "0.1.20"
+version = "0.1.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e58f42b6424a0ed536678c65fd97cd64b4344bcf86251e284f7c0ce9eee40e64"
+checksum = "2396cf99d2f58611cd69f0efeee4af3d2e2c7b61bed433515029163aa567e65c"
 dependencies = [
- "cmake",
+ "cc",
 ]
 
 [[package]]
@@ -874,6 +880,7 @@ checksum = "7ffc5c5338469d4d3ea17d269fa8ea3512ad247247c30bd2df69e68309ed0a08"
 name = "mbe"
 version = "0.0.0"
 dependencies = [
+ "cov-mark",
  "log",
  "parser",
  "profile",
@@ -892,6 +899,16 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0ee1c47aaa256ecabcaea351eae4a9b01ef39ed810004e298d2511ed284b1525"
 
 [[package]]
+name = "memmap"
+version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6585fd95e7bb50d6cc31e20d4cf9afb4e2ba16c5846fc76793f11218da9c475b"
+dependencies = [
+ "libc",
+ "winapi",
+]
+
+[[package]]
 name = "memmap2"
 version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -911,9 +928,9 @@ dependencies = [
 
 [[package]]
 name = "mimalloc"
-version = "0.1.24"
+version = "0.1.25"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "757efec188b3d2088949d912e01ea2fe87164ed6376b6c5d7dd4f3ce1668a93d"
+checksum = "1e7c6b11afd1e5e689ac96b6d18b1fc763398fe3d7eed99e8773426bc2033dfb"
 dependencies = [
  "libmimalloc-sys",
 ]
@@ -1154,8 +1171,11 @@ dependencies = [
  "crossbeam-channel",
  "jod-thread",
  "log",
+ "memmap",
+ "object",
  "serde",
  "serde_json",
+ "snap",
  "stdx",
  "tt",
 ]
@@ -1370,9 +1390,9 @@ dependencies = [
 
 [[package]]
 name = "rustc-ap-rustc_lexer"
-version = "709.0.0"
+version = "710.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f69f83314702aaccf29c7401cc63bb0d9fa7869a185a23b8379f08c91514b3f3"
+checksum = "b0bba1ca6787b6d4af505b7a940eae9ecb084dd03e07f03bf3ddbf78e738b617"
 dependencies = [
  "unicode-xid",
 ]
@@ -1466,18 +1486,18 @@ dependencies = [
 
 [[package]]
 name = "serde"
-version = "1.0.123"
+version = "1.0.124"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "92d5161132722baa40d802cc70b15262b98258453e85e5d1d365c757c73869ae"
+checksum = "bd761ff957cb2a45fbb9ab3da6512de9de55872866160b23c25f1a841e99d29f"
 dependencies = [
  "serde_derive",
 ]
 
 [[package]]
 name = "serde_derive"
-version = "1.0.123"
+version = "1.0.124"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9391c295d64fc0abb2c556bad848f33cb8296276b1ad2677d1ae1ace4f258f31"
+checksum = "1800f7693e94e186f5e25a28291ae1570da908aff7d97a095dec1e56ff99069b"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -1541,6 +1561,12 @@ dependencies = [
 ]
 
 [[package]]
+name = "snap"
+version = "1.0.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dc725476a1398f0480d56cd0ad381f6f32acf2642704456f8f59a35df464b59a"
+
+[[package]]
 name = "socket2"
 version = "0.3.19"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -1561,9 +1587,9 @@ dependencies = [
 
 [[package]]
 name = "syn"
-version = "1.0.61"
+version = "1.0.63"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ed22b90a0e734a23a7610f4283ac9e5acfb96cbb30dfefa540d66f866f1c09c5"
+checksum = "8fd9bc7ccc2688b3344c2f48b9b546648b25ce0b20fc717ee7fa7981a8ca9717"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -1587,6 +1613,7 @@ name = "syntax"
 version = "0.0.0"
 dependencies = [
  "arrayvec",
+ "cov-mark",
  "expect-test",
  "indexmap",
  "itertools",
@@ -1621,7 +1648,6 @@ dependencies = [
  "dissimilar",
  "profile",
  "rustc-hash",
- "serde_json",
  "stdx",
  "text-size",
 ]
@@ -1756,9 +1782,9 @@ dependencies = [
 
 [[package]]
 name = "tracing-tree"
-version = "0.1.8"
+version = "0.1.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1a60657cfbf397c603257a8230b3f427e6a2a4e5911a59331b9bb4dffff5b608"
+checksum = "1712b40907f8d9bc2bc66763ab61dec914b7123d7149e59feb0d4e2a95fc4967"
 dependencies = [
  "ansi_term",
  "atty",
@@ -1919,18 +1945,18 @@ checksum = "06069a848f95fceae3e5e03c0ddc8cb78452b56654ee0c8e68f938cf790fb9e3"
 
 [[package]]
 name = "xflags"
-version = "0.1.4"
+version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "222e914b43cec5d7305ac5116d10a14b3a52c50e9062d642c92631f3beabc729"
+checksum = "59ad6ce6a0b7224130015b4ebac796478ac04e0079f5d222a690efea06a9208a"
 dependencies = [
  "xflags-macros",
 ]
 
 [[package]]
 name = "xflags-macros"
-version = "0.1.4"
+version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "52f18f5b4aa7f95e209d5b9274f6164c3938920b4d5c75f97f0dd16daee25ddd"
+checksum = "c8037d3ca14996158b03c0fa905d0834906ef0fc7044df72c1f5ff690e5e62c9"
 dependencies = [
  "proc-macro2",
 ]
diff --git a/crates/hir/src/code_model.rs b/crates/hir/src/code_model.rs
deleted file mode 100644
index 9ee4b3059..000000000
--- a/crates/hir/src/code_model.rs
+++ /dev/null
@@ -1,2095 +0,0 @@
-//! FIXME: write short doc here
-use std::{iter, sync::Arc};
-
-use arrayvec::ArrayVec;
-use base_db::{CrateDisplayName, CrateId, Edition, FileId};
-use either::Either;
-use hir_def::{
-    adt::{ReprKind, StructKind, VariantData},
-    expr::{BindingAnnotation, LabelId, Pat, PatId},
-    import_map,
-    item_tree::ItemTreeNode,
-    lang_item::LangItemTarget,
-    path::ModPath,
-    per_ns::PerNs,
-    resolver::{HasResolver, Resolver},
-    src::HasSource as _,
-    type_ref::TypeRef,
-    AdtId, AssocContainerId, AssocItemId, AssocItemLoc, AttrDefId, ConstId, ConstParamId,
-    DefWithBodyId, EnumId, FunctionId, GenericDefId, HasModule, ImplId, LifetimeParamId,
-    LocalEnumVariantId, LocalFieldId, Lookup, ModuleId, StaticId, StructId, TraitId, TypeAliasId,
-    TypeParamId, UnionId,
-};
-use hir_def::{find_path::PrefixKind, item_scope::ItemInNs, visibility::Visibility};
-use hir_expand::{
-    diagnostics::DiagnosticSink,
-    name::{name, AsName},
-    MacroDefId, MacroDefKind,
-};
-use hir_ty::{
-    autoderef,
-    display::{write_bounds_like_dyn_trait_with_prefix, HirDisplayError, HirFormatter},
-    method_resolution,
-    traits::{FnTrait, Solution, SolutionVariables},
-    AliasTy, BoundVar, CallableDefId, CallableSig, Canonical, DebruijnIndex, GenericPredicate,
-    InEnvironment, Mutability, Obligation, ProjectionPredicate, ProjectionTy, Scalar, Substs,
-    TraitEnvironment, Ty, TyDefId, TyVariableKind,
-};
-use rustc_hash::FxHashSet;
-use stdx::{format_to, impl_from};
-use syntax::{
-    ast::{self, AttrsOwner, NameOwner},
-    AstNode, SmolStr,
-};
-use tt::{Ident, Leaf, Literal, TokenTree};
-
-use crate::{
-    db::{DefDatabase, HirDatabase},
-    has_source::HasSource,
-    HirDisplay, InFile, Name,
-};
-
-/// hir::Crate describes a single crate. It's the main interface with which
-/// a crate's dependencies interact. Mostly, it should be just a proxy for the
-/// root module.
-#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
-pub struct Crate {
-    pub(crate) id: CrateId,
-}
-
-#[derive(Debug)]
-pub struct CrateDependency {
-    pub krate: Crate,
-    pub name: Name,
-}
-
-impl Crate {
-    pub fn dependencies(self, db: &dyn HirDatabase) -> Vec<CrateDependency> {
-        db.crate_graph()[self.id]
-            .dependencies
-            .iter()
-            .map(|dep| {
-                let krate = Crate { id: dep.crate_id };
-                let name = dep.as_name();
-                CrateDependency { krate, name }
-            })
-            .collect()
-    }
-
-    // FIXME: add `transitive_reverse_dependencies`.
-    pub fn reverse_dependencies(self, db: &dyn HirDatabase) -> Vec<Crate> {
-        let crate_graph = db.crate_graph();
-        crate_graph
-            .iter()
-            .filter(|&krate| {
-                crate_graph[krate].dependencies.iter().any(|it| it.crate_id == self.id)
-            })
-            .map(|id| Crate { id })
-            .collect()
-    }
-
-    pub fn root_module(self, db: &dyn HirDatabase) -> Module {
-        let def_map = db.crate_def_map(self.id);
-        Module { id: def_map.module_id(def_map.root()) }
-    }
-
-    pub fn root_file(self, db: &dyn HirDatabase) -> FileId {
-        db.crate_graph()[self.id].root_file_id
-    }
-
-    pub fn edition(self, db: &dyn HirDatabase) -> Edition {
-        db.crate_graph()[self.id].edition
-    }
-
-    pub fn display_name(self, db: &dyn HirDatabase) -> Option<CrateDisplayName> {
-        db.crate_graph()[self.id].display_name.clone()
-    }
-
-    pub fn query_external_importables(
-        self,
-        db: &dyn DefDatabase,
-        query: import_map::Query,
-    ) -> impl Iterator<Item = Either<ModuleDef, MacroDef>> {
-        import_map::search_dependencies(db, self.into(), query).into_iter().map(|item| match item {
-            ItemInNs::Types(mod_id) | ItemInNs::Values(mod_id) => Either::Left(mod_id.into()),
-            ItemInNs::Macros(mac_id) => Either::Right(mac_id.into()),
-        })
-    }
-
-    pub fn all(db: &dyn HirDatabase) -> Vec<Crate> {
-        db.crate_graph().iter().map(|id| Crate { id }).collect()
-    }
-
-    /// Try to get the root URL of the documentation of a crate.
-    pub fn get_html_root_url(self: &Crate, db: &dyn HirDatabase) -> Option<String> {
-        // Look for #![doc(html_root_url = "...")]
-        let attrs = db.attrs(AttrDefId::ModuleId(self.root_module(db).into()));
-        let doc_attr_q = attrs.by_key("doc");
-
-        if !doc_attr_q.exists() {
-            return None;
-        }
-
-        let doc_url = doc_attr_q.tt_values().map(|tt| {
-            let name = tt.token_trees.iter()
-                .skip_while(|tt| !matches!(tt, TokenTree::Leaf(Leaf::Ident(Ident{text: ref ident, ..})) if ident == "html_root_url"))
-                .skip(2)
-                .next();
-
-            match name {
-                Some(TokenTree::Leaf(Leaf::Literal(Literal{ref text, ..}))) => Some(text),
-                _ => None
-            }
-        }).flat_map(|t| t).next();
-
-        doc_url.map(|s| s.trim_matches('"').trim_end_matches('/').to_owned() + "/")
-    }
-}
-
-#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
-pub struct Module {
-    pub(crate) id: ModuleId,
-}
-
-/// The defs which can be visible in the module.
-#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
-pub enum ModuleDef {
-    Module(Module),
-    Function(Function),
-    Adt(Adt),
-    // Can't be directly declared, but can be imported.
-    Variant(Variant),
-    Const(Const),
-    Static(Static),
-    Trait(Trait),
-    TypeAlias(TypeAlias),
-    BuiltinType(BuiltinType),
-}
-impl_from!(
-    Module,
-    Function,
-    Adt(Struct, Enum, Union),
-    Variant,
-    Const,
-    Static,
-    Trait,
-    TypeAlias,
-    BuiltinType
-    for ModuleDef
-);
-
-impl From<VariantDef> for ModuleDef {
-    fn from(var: VariantDef) -> Self {
-        match var {
-            VariantDef::Struct(t) => Adt::from(t).into(),
-            VariantDef::Union(t) => Adt::from(t).into(),
-            VariantDef::Variant(t) => t.into(),
-        }
-    }
-}
-
-impl ModuleDef {
-    pub fn module(self, db: &dyn HirDatabase) -> Option<Module> {
-        match self {
-            ModuleDef::Module(it) => it.parent(db),
-            ModuleDef::Function(it) => Some(it.module(db)),
-            ModuleDef::Adt(it) => Some(it.module(db)),
-            ModuleDef::Variant(it) => Some(it.module(db)),
-            ModuleDef::Const(it) => Some(it.module(db)),
-            ModuleDef::Static(it) => Some(it.module(db)),
-            ModuleDef::Trait(it) => Some(it.module(db)),
-            ModuleDef::TypeAlias(it) => Some(it.module(db)),
-            ModuleDef::BuiltinType(_) => None,
-        }
-    }
-
-    pub fn canonical_path(&self, db: &dyn HirDatabase) -> Option<String> {
-        let mut segments = Vec::new();
-        segments.push(self.name(db)?.to_string());
-        for m in self.module(db)?.path_to_root(db) {
-            segments.extend(m.name(db).map(|it| it.to_string()))
-        }
-        segments.reverse();
-        Some(segments.join("::"))
-    }
-
-    pub fn definition_visibility(&self, db: &dyn HirDatabase) -> Option<Visibility> {
-        let module = match self {
-            ModuleDef::Module(it) => it.parent(db)?,
-            ModuleDef::Function(it) => return Some(it.visibility(db)),
-            ModuleDef::Adt(it) => it.module(db),
-            ModuleDef::Variant(it) => {
-                let parent = it.parent_enum(db);
-                let module = it.module(db);
-                return module.visibility_of(db, &ModuleDef::Adt(Adt::Enum(parent)));
-            }
-            ModuleDef::Const(it) => return Some(it.visibility(db)),
-            ModuleDef::Static(it) => it.module(db),
-            ModuleDef::Trait(it) => it.module(db),
-            ModuleDef::TypeAlias(it) => return Some(it.visibility(db)),
-            ModuleDef::BuiltinType(_) => return None,
-        };
-
-        module.visibility_of(db, self)
-    }
-
-    pub fn name(self, db: &dyn HirDatabase) -> Option<Name> {
-        match self {
-            ModuleDef::Adt(it) => Some(it.name(db)),
-            ModuleDef::Trait(it) => Some(it.name(db)),
-            ModuleDef::Function(it) => Some(it.name(db)),
-            ModuleDef::Variant(it) => Some(it.name(db)),
-            ModuleDef::TypeAlias(it) => Some(it.name(db)),
-            ModuleDef::Module(it) => it.name(db),
-            ModuleDef::Const(it) => it.name(db),
-            ModuleDef::Static(it) => it.name(db),
-
-            ModuleDef::BuiltinType(it) => Some(it.name()),
-        }
-    }
-
-    pub fn diagnostics(self, db: &dyn HirDatabase, sink: &mut DiagnosticSink) {
-        let id = match self {
-            ModuleDef::Adt(it) => match it {
-                Adt::Struct(it) => it.id.into(),
-                Adt::Enum(it) => it.id.into(),
-                Adt::Union(it) => it.id.into(),
-            },
-            ModuleDef::Trait(it) => it.id.into(),
-            ModuleDef::Function(it) => it.id.into(),
-            ModuleDef::TypeAlias(it) => it.id.into(),
-            ModuleDef::Module(it) => it.id.into(),
-            ModuleDef::Const(it) => it.id.into(),
-            ModuleDef::Static(it) => it.id.into(),
-            _ => return,
-        };
-
-        let module = match self.module(db) {
-            Some(it) => it,
-            None => return,
-        };
-
-        hir_ty::diagnostics::validate_module_item(db, module.id.krate(), id, sink)
-    }
-}
-
-impl Module {
-    /// Name of this module.
-    pub fn name(self, db: &dyn HirDatabase) -> Option<Name> {
-        let def_map = self.id.def_map(db.upcast());
-        let parent = def_map[self.id.local_id].parent?;
-        def_map[parent].children.iter().find_map(|(name, module_id)| {
-            if *module_id == self.id.local_id {
-                Some(name.clone())
-            } else {
-                None
-            }
-        })
-    }
-
-    /// Returns the crate this module is part of.
-    pub fn krate(self) -> Crate {
-        Crate { id: self.id.krate() }
-    }
-
-    /// Topmost parent of this module. Every module has a `crate_root`, but some
-    /// might be missing `krate`. This can happen if a module's file is not included
-    /// in the module tree of any target in `Cargo.toml`.
-    pub fn crate_root(self, db: &dyn HirDatabase) -> Module {
-        let def_map = db.crate_def_map(self.id.krate());
-        Module { id: def_map.module_id(def_map.root()) }
-    }
-
-    /// Iterates over all child modules.
-    pub fn children(self, db: &dyn HirDatabase) -> impl Iterator<Item = Module> {
-        let def_map = self.id.def_map(db.upcast());
-        let children = def_map[self.id.local_id]
-            .children
-            .iter()
-            .map(|(_, module_id)| Module { id: def_map.module_id(*module_id) })
-            .collect::<Vec<_>>();
-        children.into_iter()
-    }
-
-    /// Finds a parent module.
-    pub fn parent(self, db: &dyn HirDatabase) -> Option<Module> {
-        // FIXME: handle block expressions as modules (their parent is in a different DefMap)
-        let def_map = self.id.def_map(db.upcast());
-        let parent_id = def_map[self.id.local_id].parent?;
-        Some(Module { id: def_map.module_id(parent_id) })
-    }
-
-    pub fn path_to_root(self, db: &dyn HirDatabase) -> Vec<Module> {
-        let mut res = vec![self];
-        let mut curr = self;
-        while let Some(next) = curr.parent(db) {
-            res.push(next);
-            curr = next
-        }
-        res
-    }
-
-    /// Returns a `ModuleScope`: a set of items, visible in this module.
-    pub fn scope(
-        self,
-        db: &dyn HirDatabase,
-        visible_from: Option<Module>,
-    ) -> Vec<(Name, ScopeDef)> {
-        self.id.def_map(db.upcast())[self.id.local_id]
-            .scope
-            .entries()
-            .filter_map(|(name, def)| {
-                if let Some(m) = visible_from {
-                    let filtered =
-                        def.filter_visibility(|vis| vis.is_visible_from(db.upcast(), m.id));
-                    if filtered.is_none() && !def.is_none() {
-                        None
-                    } else {
-                        Some((name, filtered))
-                    }
-                } else {
-                    Some((name, def))
-                }
-            })
-            .flat_map(|(name, def)| {
-                ScopeDef::all_items(def).into_iter().map(move |item| (name.clone(), item))
-            })
-            .collect()
-    }
-
-    pub fn visibility_of(self, db: &dyn HirDatabase, def: &ModuleDef) -> Option<Visibility> {
-        self.id.def_map(db.upcast())[self.id.local_id].scope.visibility_of(def.clone().into())
-    }
-
-    pub fn diagnostics(self, db: &dyn HirDatabase, sink: &mut DiagnosticSink) {
-        let _p = profile::span("Module::diagnostics").detail(|| {
-            format!("{:?}", self.name(db).map_or("<unknown>".into(), |name| name.to_string()))
-        });
-        let def_map = self.id.def_map(db.upcast());
-        def_map.add_diagnostics(db.upcast(), self.id.local_id, sink);
-        for decl in self.declarations(db) {
-            match decl {
-                crate::ModuleDef::Function(f) => f.diagnostics(db, sink),
-                crate::ModuleDef::Module(m) => {
-                    // Only add diagnostics from inline modules
-                    if def_map[m.id.local_id].origin.is_inline() {
-                        m.diagnostics(db, sink)
-                    }
-                }
-                _ => {
-                    decl.diagnostics(db, sink);
-                }
-            }
-        }
-
-        for impl_def in self.impl_defs(db) {
-            for item in impl_def.items(db) {
-                if let AssocItem::Function(f) = item {
-                    f.diagnostics(db, sink);
-                }
-            }
-        }
-    }
-
-    pub fn declarations(self, db: &dyn HirDatabase) -> Vec<ModuleDef> {
-        let def_map = self.id.def_map(db.upcast());
-        def_map[self.id.local_id].scope.declarations().map(ModuleDef::from).collect()
-    }
-
-    pub fn impl_defs(self, db: &dyn HirDatabase) -> Vec<Impl> {
-        let def_map = self.id.def_map(db.upcast());
-        def_map[self.id.local_id].scope.impls().map(Impl::from).collect()
-    }
-
-    /// Finds a path that can be used to refer to the given item from within
-    /// this module, if possible.
-    pub fn find_use_path(self, db: &dyn DefDatabase, item: impl Into<ItemInNs>) -> Option<ModPath> {
-        hir_def::find_path::find_path(db, item.into(), self.into())
-    }
-
-    /// Finds a path that can be used to refer to the given item from within
-    /// this module, if possible. This is used for returning import paths for use-statements.
-    pub fn find_use_path_prefixed(
-        self,
-        db: &dyn DefDatabase,
-        item: impl Into<ItemInNs>,
-        prefix_kind: PrefixKind,
-    ) -> Option<ModPath> {
-        hir_def::find_path::find_path_prefixed(db, item.into(), self.into(), prefix_kind)
-    }
-}
-
-#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
-pub struct Field {
-    pub(crate) parent: VariantDef,
-    pub(crate) id: LocalFieldId,
-}
-
-#[derive(Debug, PartialEq, Eq)]
-pub enum FieldSource {
-    Named(ast::RecordField),
-    Pos(ast::TupleField),
-}
-
-impl Field {
-    pub fn name(&self, db: &dyn HirDatabase) -> Name {
-        self.parent.variant_data(db).fields()[self.id].name.clone()
-    }
-
-    /// Returns the type as in the signature of the struct (i.e., with
-    /// placeholder types for type parameters). This is good for showing
-    /// signature help, but not so good to actually get the type of the field
-    /// when you actually have a variable of the struct.
-    pub fn signature_ty(&self, db: &dyn HirDatabase) -> Type {
-        let var_id = self.parent.into();
-        let generic_def_id: GenericDefId = match self.parent {
-            VariantDef::Struct(it) => it.id.into(),
-            VariantDef::Union(it) => it.id.into(),
-            VariantDef::Variant(it) => it.parent.id.into(),
-        };
-        let substs = Substs::type_params(db, generic_def_id);
-        let ty = db.field_types(var_id)[self.id].clone().subst(&substs);
-        Type::new(db, self.parent.module(db).id.krate(), var_id, ty)
-    }
-
-    pub fn parent_def(&self, _db: &dyn HirDatabase) -> VariantDef {
-        self.parent
-    }
-}
-
-impl HasVisibility for Field {
-    fn visibility(&self, db: &dyn HirDatabase) -> Visibility {
-        let variant_data = self.parent.variant_data(db);
-        let visibility = &variant_data.fields()[self.id].visibility;
-        let parent_id: hir_def::VariantId = self.parent.into();
-        visibility.resolve(db.upcast(), &parent_id.resolver(db.upcast()))
-    }
-}
-
-#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
-pub struct Struct {
-    pub(crate) id: StructId,
-}
-
-impl Struct {
-    pub fn module(self, db: &dyn HirDatabase) -> Module {
-        Module { id: self.id.lookup(db.upcast()).container.module(db.upcast()) }
-    }
-
-    pub fn krate(self, db: &dyn HirDatabase) -> Option<Crate> {
-        Some(self.module(db).krate())
-    }
-
-    pub fn name(self, db: &dyn HirDatabase) -> Name {
-        db.struct_data(self.id).name.clone()
-    }
-
-    pub fn fields(self, db: &dyn HirDatabase) -> Vec<Field> {
-        db.struct_data(self.id)
-            .variant_data
-            .fields()
-            .iter()
-            .map(|(id, _)| Field { parent: self.into(), id })
-            .collect()
-    }
-
-    pub fn ty(self, db: &dyn HirDatabase) -> Type {
-        Type::from_def(
-            db,
-            self.id.lookup(db.upcast()).container.module(db.upcast()).krate(),
-            self.id,
-        )
-    }
-
-    pub fn repr(self, db: &dyn HirDatabase) -> Option<ReprKind> {
-        db.struct_data(self.id).repr.clone()
-    }
-
-    pub fn kind(self, db: &dyn HirDatabase) -> StructKind {
-        self.variant_data(db).kind()
-    }
-
-    fn variant_data(self, db: &dyn HirDatabase) -> Arc<VariantData> {
-        db.struct_data(self.id).variant_data.clone()
-    }
-}
-
-#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
-pub struct Union {
-    pub(crate) id: UnionId,
-}
-
-impl Union {
-    pub fn name(self, db: &dyn HirDatabase) -> Name {
-        db.union_data(self.id).name.clone()
-    }
-
-    pub fn module(self, db: &dyn HirDatabase) -> Module {
-        Module { id: self.id.lookup(db.upcast()).container.module(db.upcast()) }
-    }
-
-    pub fn ty(self, db: &dyn HirDatabase) -> Type {
-        Type::from_def(
-            db,
-            self.id.lookup(db.upcast()).container.module(db.upcast()).krate(),
-            self.id,
-        )
-    }
-
-    pub fn fields(self, db: &dyn HirDatabase) -> Vec<Field> {
-        db.union_data(self.id)
-            .variant_data
-            .fields()
-            .iter()
-            .map(|(id, _)| Field { parent: self.into(), id })
-            .collect()
-    }
-
-    fn variant_data(self, db: &dyn HirDatabase) -> Arc<VariantData> {
-        db.union_data(self.id).variant_data.clone()
-    }
-}
-
-#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
-pub struct Enum {
-    pub(crate) id: EnumId,
-}
-
-impl Enum {
-    pub fn module(self, db: &dyn HirDatabase) -> Module {
-        Module { id: self.id.lookup(db.upcast()).container.module(db.upcast()) }
-    }
-
-    pub fn krate(self, db: &dyn HirDatabase) -> Option<Crate> {
-        Some(self.module(db).krate())
-    }
-
-    pub fn name(self, db: &dyn HirDatabase) -> Name {
-        db.enum_data(self.id).name.clone()
-    }
-
-    pub fn variants(self, db: &dyn HirDatabase) -> Vec<Variant> {
-        db.enum_data(self.id).variants.iter().map(|(id, _)| Variant { parent: self, id }).collect()
-    }
-
-    pub fn ty(self, db: &dyn HirDatabase) -> Type {
-        Type::from_def(
-            db,
-            self.id.lookup(db.upcast()).container.module(db.upcast()).krate(),
-            self.id,
-        )
-    }
-}
-
-#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
-pub struct Variant {
-    pub(crate) parent: Enum,
-    pub(crate) id: LocalEnumVariantId,
-}
-
-impl Variant {
-    pub fn module(self, db: &dyn HirDatabase) -> Module {
-        self.parent.module(db)
-    }
-    pub fn parent_enum(self, _db: &dyn HirDatabase) -> Enum {
-        self.parent
-    }
-
-    pub fn name(self, db: &dyn HirDatabase) -> Name {
-        db.enum_data(self.parent.id).variants[self.id].name.clone()
-    }
-
-    pub fn fields(self, db: &dyn HirDatabase) -> Vec<Field> {
-        self.variant_data(db)
-            .fields()
-            .iter()
-            .map(|(id, _)| Field { parent: self.into(), id })
-            .collect()
-    }
-
-    pub fn kind(self, db: &dyn HirDatabase) -> StructKind {
-        self.variant_data(db).kind()
-    }
-
-    pub(crate) fn variant_data(self, db: &dyn HirDatabase) -> Arc<VariantData> {
-        db.enum_data(self.parent.id).variants[self.id].variant_data.clone()
-    }
-}
-
-/// A Data Type
-#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
-pub enum Adt {
-    Struct(Struct),
-    Union(Union),
-    Enum(Enum),
-}
-impl_from!(Struct, Union, Enum for Adt);
-
-impl Adt {
-    pub fn has_non_default_type_params(self, db: &dyn HirDatabase) -> bool {
-        let subst = db.generic_defaults(self.into());
-        subst.iter().any(|ty| &ty.value == &Ty::Unknown)
-    }
-
-    /// Turns this ADT into a type. Any type parameters of the ADT will be
-    /// turned into unknown types, which is good for e.g. finding the most
-    /// general set of completions, but will not look very nice when printed.
-    pub fn ty(self, db: &dyn HirDatabase) -> Type {
-        let id = AdtId::from(self);
-        Type::from_def(db, id.module(db.upcast()).krate(), id)
-    }
-
-    pub fn module(self, db: &dyn HirDatabase) -> Module {
-        match self {
-            Adt::Struct(s) => s.module(db),
-            Adt::Union(s) => s.module(db),
-            Adt::Enum(e) => e.module(db),
-        }
-    }
-
-    pub fn krate(self, db: &dyn HirDatabase) -> Option<Crate> {
-        Some(self.module(db).krate())
-    }
-
-    pub fn name(self, db: &dyn HirDatabase) -> Name {
-        match self {
-            Adt::Struct(s) => s.name(db),
-            Adt::Union(u) => u.name(db),
-            Adt::Enum(e) => e.name(db),
-        }
-    }
-}
-
-#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
-pub enum VariantDef {
-    Struct(Struct),
-    Union(Union),
-    Variant(Variant),
-}
-impl_from!(Struct, Union, Variant for VariantDef);
-
-impl VariantDef {
-    pub fn fields(self, db: &dyn HirDatabase) -> Vec<Field> {
-        match self {
-            VariantDef::Struct(it) => it.fields(db),
-            VariantDef::Union(it) => it.fields(db),
-            VariantDef::Variant(it) => it.fields(db),
-        }
-    }
-
-    pub fn module(self, db: &dyn HirDatabase) -> Module {
-        match self {
-            VariantDef::Struct(it) => it.module(db),
-            VariantDef::Union(it) => it.module(db),
-            VariantDef::Variant(it) => it.module(db),
-        }
-    }
-
-    pub fn name(&self, db: &dyn HirDatabase) -> Name {
-        match self {
-            VariantDef::Struct(s) => s.name(db),
-            VariantDef::Union(u) => u.name(db),
-            VariantDef::Variant(e) => e.name(db),
-        }
-    }
-
-    pub(crate) fn variant_data(self, db: &dyn HirDatabase) -> Arc<VariantData> {
-        match self {
-            VariantDef::Struct(it) => it.variant_data(db),
-            VariantDef::Union(it) => it.variant_data(db),
-            VariantDef::Variant(it) => it.variant_data(db),
-        }
-    }
-}
-
-/// The defs which have a body.
-#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
-pub enum DefWithBody {
-    Function(Function),
-    Static(Static),
-    Const(Const),
-}
-impl_from!(Function, Const, Static for DefWithBody);
-
-impl DefWithBody {
-    pub fn module(self, db: &dyn HirDatabase) -> Module {
-        match self {
-            DefWithBody::Const(c) => c.module(db),
-            DefWithBody::Function(f) => f.module(db),
-            DefWithBody::Static(s) => s.module(db),
-        }
-    }
-
-    pub fn name(self, db: &dyn HirDatabase) -> Option<Name> {
-        match self {
-            DefWithBody::Function(f) => Some(f.name(db)),
-            DefWithBody::Static(s) => s.name(db),
-            DefWithBody::Const(c) => c.name(db),
-        }
-    }
-}
-
-#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
-pub struct Function {
-    pub(crate) id: FunctionId,
-}
-
-impl Function {
-    pub fn module(self, db: &dyn HirDatabase) -> Module {
-        self.id.lookup(db.upcast()).module(db.upcast()).into()
-    }
-
-    pub fn krate(self, db: &dyn HirDatabase) -> Option<Crate> {
-        Some(self.module(db).krate())
-    }
-
-    pub fn name(self, db: &dyn HirDatabase) -> Name {
-        db.function_data(self.id).name.clone()
-    }
-
-    /// Get this function's return type
-    pub fn ret_type(self, db: &dyn HirDatabase) -> Type {
-        let resolver = self.id.resolver(db.upcast());
-        let ret_type = &db.function_data(self.id).ret_type;
-        let ctx = hir_ty::TyLoweringContext::new(db, &resolver);
-        let environment = TraitEnvironment::lower(db, &resolver);
-        Type {
-            krate: self.id.lookup(db.upcast()).container.module(db.upcast()).krate(),
-            ty: InEnvironment { value: Ty::from_hir_ext(&ctx, ret_type).0, environment },
-        }
-    }
-
-    pub fn self_param(self, db: &dyn HirDatabase) -> Option<SelfParam> {
-        if !db.function_data(self.id).has_self_param {
-            return None;
-        }
-        Some(SelfParam { func: self.id })
-    }
-
-    pub fn assoc_fn_params(self, db: &dyn HirDatabase) -> Vec<Param> {
-        let resolver = self.id.resolver(db.upcast());
-        let ctx = hir_ty::TyLoweringContext::new(db, &resolver);
-        let environment = TraitEnvironment::lower(db, &resolver);
-        db.function_data(self.id)
-            .params
-            .iter()
-            .map(|type_ref| {
-                let ty = Type {
-                    krate: self.id.lookup(db.upcast()).container.module(db.upcast()).krate(),
-                    ty: InEnvironment {
-                        value: Ty::from_hir_ext(&ctx, type_ref).0,
-                        environment: environment.clone(),
-                    },
-                };
-                Param { ty }
-            })
-            .collect()
-    }
-    pub fn method_params(self, db: &dyn HirDatabase) -> Option<Vec<Param>> {
-        if self.self_param(db).is_none() {
-            return None;
-        }
-        let mut res = self.assoc_fn_params(db);
-        res.remove(0);
-        Some(res)
-    }
-
-    pub fn is_unsafe(self, db: &dyn HirDatabase) -> bool {
-        db.function_data(self.id).is_unsafe
-    }
-
-    pub fn diagnostics(self, db: &dyn HirDatabase, sink: &mut DiagnosticSink) {
-        let krate = self.module(db).id.krate();
-        hir_def::diagnostics::validate_body(db.upcast(), self.id.into(), sink);
-        hir_ty::diagnostics::validate_module_item(db, krate, self.id.into(), sink);
-        hir_ty::diagnostics::validate_body(db, self.id.into(), sink);
-    }
-
-    /// Whether this function declaration has a definition.
-    ///
-    /// This is false in the case of required (not provided) trait methods.
-    pub fn has_body(self, db: &dyn HirDatabase) -> bool {
-        db.function_data(self.id).has_body
-    }
-
-    /// A textual representation of the HIR of this function for debugging purposes.
-    pub fn debug_hir(self, db: &dyn HirDatabase) -> String {
-        let body = db.body(self.id.into());
-
-        let mut result = String::new();
-        format_to!(result, "HIR expressions in the body of `{}`:\n", self.name(db));
-        for (id, expr) in body.exprs.iter() {
-            format_to!(result, "{:?}: {:?}\n", id, expr);
-        }
-
-        result
-    }
-}
-
-// Note: logically, this belongs to `hir_ty`, but we are not using it there yet.
-pub enum Access {
-    Shared,
-    Exclusive,
-    Owned,
-}
-
-impl From<Mutability> for Access {
-    fn from(mutability: Mutability) -> Access {
-        match mutability {
-            Mutability::Not => Access::Shared,
-            Mutability::Mut => Access::Exclusive,
-        }
-    }
-}
-
-#[derive(Debug)]
-pub struct Param {
-    ty: Type,
-}
-
-impl Param {
-    pub fn ty(&self) -> &Type {
-        &self.ty
-    }
-}
-
-#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
-pub struct SelfParam {
-    func: FunctionId,
-}
-
-impl SelfParam {
-    pub fn access(self, db: &dyn HirDatabase) -> Access {
-        let func_data = db.function_data(self.func);
-        func_data
-            .params
-            .first()
-            .map(|param| match *param {
-                TypeRef::Reference(.., mutability) => match mutability {
-                    hir_def::type_ref::Mutability::Shared => Access::Shared,
-                    hir_def::type_ref::Mutability::Mut => Access::Exclusive,
-                },
-                _ => Access::Owned,
-            })
-            .unwrap_or(Access::Owned)
-    }
-}
-
-impl HasVisibility for Function {
-    fn visibility(&self, db: &dyn HirDatabase) -> Visibility {
-        let function_data = db.function_data(self.id);
-        let visibility = &function_data.visibility;
-        visibility.resolve(db.upcast(), &self.id.resolver(db.upcast()))
-    }
-}
-
-#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
-pub struct Const {
-    pub(crate) id: ConstId,
-}
-
-impl Const {
-    pub fn module(self, db: &dyn HirDatabase) -> Module {
-        Module { id: self.id.lookup(db.upcast()).module(db.upcast()) }
-    }
-
-    pub fn krate(self, db: &dyn HirDatabase) -> Option<Crate> {
-        Some(self.module(db).krate())
-    }
-
-    pub fn name(self, db: &dyn HirDatabase) -> Option<Name> {
-        db.const_data(self.id).name.clone()
-    }
-}
-
-impl HasVisibility for Const {
-    fn visibility(&self, db: &dyn HirDatabase) -> Visibility {
-        let function_data = db.const_data(self.id);
-        let visibility = &function_data.visibility;
-        visibility.resolve(db.upcast(), &self.id.resolver(db.upcast()))
-    }
-}
-
-#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
-pub struct Static {
-    pub(crate) id: StaticId,
-}
-
-impl Static {
-    pub fn module(self, db: &dyn HirDatabase) -> Module {
-        Module { id: self.id.lookup(db.upcast()).module(db.upcast()) }
-    }
-
-    pub fn krate(self, db: &dyn HirDatabase) -> Option<Crate> {
-        Some(self.module(db).krate())
-    }
-
-    pub fn name(self, db: &dyn HirDatabase) -> Option<Name> {
-        db.static_data(self.id).name.clone()
-    }
-
-    pub fn is_mut(self, db: &dyn HirDatabase) -> bool {
-        db.static_data(self.id).mutable
-    }
-}
-
-#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
-pub struct Trait {
-    pub(crate) id: TraitId,
-}
-
-impl Trait {
-    pub fn module(self, db: &dyn HirDatabase) -> Module {
-        Module { id: self.id.lookup(db.upcast()).container.module(db.upcast()) }
-    }
-
-    pub fn name(self, db: &dyn HirDatabase) -> Name {
-        db.trait_data(self.id).name.clone()
-    }
-
-    pub fn items(self, db: &dyn HirDatabase) -> Vec<AssocItem> {
-        db.trait_data(self.id).items.iter().map(|(_name, it)| (*it).into()).collect()
-    }
-
-    pub fn is_auto(self, db: &dyn HirDatabase) -> bool {
-        db.trait_data(self.id).auto
-    }
-}
-
-#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
-pub struct TypeAlias {
-    pub(crate) id: TypeAliasId,
-}
-
-impl TypeAlias {
-    pub fn has_non_default_type_params(self, db: &dyn HirDatabase) -> bool {
-        let subst = db.generic_defaults(self.id.into());
-        subst.iter().any(|ty| &ty.value == &Ty::Unknown)
-    }
-
-    pub fn module(self, db: &dyn HirDatabase) -> Module {
-        Module { id: self.id.lookup(db.upcast()).module(db.upcast()) }
-    }
-
-    pub fn krate(self, db: &dyn HirDatabase) -> Option<Crate> {
-        Some(self.module(db).krate())
-    }
-
-    pub fn type_ref(self, db: &dyn HirDatabase) -> Option<TypeRef> {
-        db.type_alias_data(self.id).type_ref.clone()
-    }
-
-    pub fn ty(self, db: &dyn HirDatabase) -> Type {
-        Type::from_def(db, self.id.lookup(db.upcast()).module(db.upcast()).krate(), self.id)
-    }
-
-    pub fn name(self, db: &dyn HirDatabase) -> Name {
-        db.type_alias_data(self.id).name.clone()
-    }
-}
-
-impl HasVisibility for TypeAlias {
-    fn visibility(&self, db: &dyn HirDatabase) -> Visibility {
-        let function_data = db.type_alias_data(self.id);
-        let visibility = &function_data.visibility;
-        visibility.resolve(db.upcast(), &self.id.resolver(db.upcast()))
-    }
-}
-
-#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
-pub struct BuiltinType {
-    pub(crate) inner: hir_def::builtin_type::BuiltinType,
-}
-
-impl BuiltinType {
-    pub fn ty(self, db: &dyn HirDatabase, module: Module) -> Type {
-        let resolver = module.id.resolver(db.upcast());
-        Type::new_with_resolver(db, &resolver, Ty::builtin(self.inner))
-            .expect("crate not present in resolver")
-    }
-
-    pub fn name(self) -> Name {
-        self.inner.as_name()
-    }
-}
-
-#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
-pub struct MacroDef {
-    pub(crate) id: MacroDefId,
-}
-
-impl MacroDef {
-    /// FIXME: right now, this just returns the root module of the crate that
-    /// defines this macro. The reasons for this is that macros are expanded
-    /// early, in `hir_expand`, where modules simply do not exist yet.
-    pub fn module(self, db: &dyn HirDatabase) -> Option<Module> {
-        let krate = self.id.krate;
-        let def_map = db.crate_def_map(krate);
-        let module_id = def_map.root();
-        Some(Module { id: def_map.module_id(module_id) })
-    }
-
-    /// XXX: this parses the file
-    pub fn name(self, db: &dyn HirDatabase) -> Option<Name> {
-        self.source(db)?.value.name().map(|it| it.as_name())
-    }
-
-    /// Indicate it is a proc-macro
-    pub fn is_proc_macro(&self) -> bool {
-        matches!(self.id.kind, MacroDefKind::ProcMacro(_))
-    }
-
-    /// Indicate it is a derive macro
-    pub fn is_derive_macro(&self) -> bool {
-        matches!(self.id.kind, MacroDefKind::ProcMacro(_) | MacroDefKind::BuiltInDerive(_))
-    }
-}
-
-/// Invariant: `inner.as_assoc_item(db).is_some()`
-/// We do not actively enforce this invariant.
-#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
-pub enum AssocItem {
-    Function(Function),
-    Const(Const),
-    TypeAlias(TypeAlias),
-}
-pub enum AssocItemContainer {
-    Trait(Trait),
-    Impl(Impl),
-}
-pub trait AsAssocItem {
-    fn as_assoc_item(self, db: &dyn HirDatabase) -> Option<AssocItem>;
-}
-
-impl AsAssocItem for Function {
-    fn as_assoc_item(self, db: &dyn HirDatabase) -> Option<AssocItem> {
-        as_assoc_item(db, AssocItem::Function, self.id)
-    }
-}
-impl AsAssocItem for Const {
-    fn as_assoc_item(self, db: &dyn HirDatabase) -> Option<AssocItem> {
-        as_assoc_item(db, AssocItem::Const, self.id)
-    }
-}
-impl AsAssocItem for TypeAlias {
-    fn as_assoc_item(self, db: &dyn HirDatabase) -> Option<AssocItem> {
-        as_assoc_item(db, AssocItem::TypeAlias, self.id)
-    }
-}
-impl AsAssocItem for ModuleDef {
-    fn as_assoc_item(self, db: &dyn HirDatabase) -> Option<AssocItem> {
-        match self {
-            ModuleDef::Function(it) => it.as_assoc_item(db),
-            ModuleDef::Const(it) => it.as_assoc_item(db),
-            ModuleDef::TypeAlias(it) => it.as_assoc_item(db),
-            _ => None,
-        }
-    }
-}
-fn as_assoc_item<ID, DEF, CTOR, AST>(db: &dyn HirDatabase, ctor: CTOR, id: ID) -> Option<AssocItem>
-where
-    ID: Lookup<Data = AssocItemLoc<AST>>,
-    DEF: From<ID>,
-    CTOR: FnOnce(DEF) -> AssocItem,
-    AST: ItemTreeNode,
-{
-    match id.lookup(db.upcast()).container {
-        AssocContainerId::TraitId(_) | AssocContainerId::ImplId(_) => Some(ctor(DEF::from(id))),
-        AssocContainerId::ContainerId(_) => None,
-    }
-}
-
-impl AssocItem {
-    pub fn name(self, db: &dyn HirDatabase) -> Option<Name> {
-        match self {
-            AssocItem::Function(it) => Some(it.name(db)),
-            AssocItem::Const(it) => it.name(db),
-            AssocItem::TypeAlias(it) => Some(it.name(db)),
-        }
-    }
-    pub fn module(self, db: &dyn HirDatabase) -> Module {
-        match self {
-            AssocItem::Function(f) => f.module(db),
-            AssocItem::Const(c) => c.module(db),
-            AssocItem::TypeAlias(t) => t.module(db),
-        }
-    }
-    pub fn container(self, db: &dyn HirDatabase) -> AssocItemContainer {
-        let container = match self {
-            AssocItem::Function(it) => it.id.lookup(db.upcast()).container,
-            AssocItem::Const(it) => it.id.lookup(db.upcast()).container,
-            AssocItem::TypeAlias(it) => it.id.lookup(db.upcast()).container,
-        };
-        match container {
-            AssocContainerId::TraitId(id) => AssocItemContainer::Trait(id.into()),
-            AssocContainerId::ImplId(id) => AssocItemContainer::Impl(id.into()),
-            AssocContainerId::ContainerId(_) => panic!("invalid AssocItem"),
-        }
-    }
-
-    pub fn containing_trait(self, db: &dyn HirDatabase) -> Option<Trait> {
-        match self.container(db) {
-            AssocItemContainer::Trait(t) => Some(t),
-            _ => None,
-        }
-    }
-}
-
-impl HasVisibility for AssocItem {
-    fn visibility(&self, db: &dyn HirDatabase) -> Visibility {
-        match self {
-            AssocItem::Function(f) => f.visibility(db),
-            AssocItem::Const(c) => c.visibility(db),
-            AssocItem::TypeAlias(t) => t.visibility(db),
-        }
-    }
-}
-
-#[derive(Clone, Copy, PartialEq, Eq, Debug, Hash)]
-pub enum GenericDef {
-    Function(Function),
-    Adt(Adt),
-    Trait(Trait),
-    TypeAlias(TypeAlias),
-    Impl(Impl),
-    // enum variants cannot have generics themselves, but their parent enums
-    // can, and this makes some code easier to write
-    Variant(Variant),
-    // consts can have type parameters from their parents (i.e. associated consts of traits)
-    Const(Const),
-}
-impl_from!(
-    Function,
-    Adt(Struct, Enum, Union),
-    Trait,
-    TypeAlias,
-    Impl,
-    Variant,
-    Const
-    for GenericDef
-);
-
-impl GenericDef {
-    pub fn params(self, db: &dyn HirDatabase) -> Vec<GenericParam> {
-        let generics = db.generic_params(self.into());
-        let ty_params = generics
-            .types
-            .iter()
-            .map(|(local_id, _)| TypeParam { id: TypeParamId { parent: self.into(), local_id } })
-            .map(GenericParam::TypeParam);
-        let lt_params = generics
-            .lifetimes
-            .iter()
-            .map(|(local_id, _)| LifetimeParam {
-                id: LifetimeParamId { parent: self.into(), local_id },
-            })
-            .map(GenericParam::LifetimeParam);
-        let const_params = generics
-            .consts
-            .iter()
-            .map(|(local_id, _)| ConstParam { id: ConstParamId { parent: self.into(), local_id } })
-            .map(GenericParam::ConstParam);
-        ty_params.chain(lt_params).chain(const_params).collect()
-    }
-
-    pub fn type_params(self, db: &dyn HirDatabase) -> Vec<TypeParam> {
-        let generics = db.generic_params(self.into());
-        generics
-            .types
-            .iter()
-            .map(|(local_id, _)| TypeParam { id: TypeParamId { parent: self.into(), local_id } })
-            .collect()
-    }
-}
-
-#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
-pub struct Local {
-    pub(crate) parent: DefWithBodyId,
-    pub(crate) pat_id: PatId,
-}
-
-impl Local {
-    pub fn is_param(self, db: &dyn HirDatabase) -> bool {
-        let src = self.source(db);
-        match src.value {
-            Either::Left(bind_pat) => {
-                bind_pat.syntax().ancestors().any(|it| ast::Param::can_cast(it.kind()))
-            }
-            Either::Right(_self_param) => true,
-        }
-    }
-
-    // FIXME: why is this an option? It shouldn't be?
-    pub fn name(self, db: &dyn HirDatabase) -> Option<Name> {
-        let body = db.body(self.parent.into());
-        match &body[self.pat_id] {
-            Pat::Bind { name, .. } => Some(name.clone()),
-            _ => None,
-        }
-    }
-
-    pub fn is_self(self, db: &dyn HirDatabase) -> bool {
-        self.name(db) == Some(name![self])
-    }
-
-    pub fn is_mut(self, db: &dyn HirDatabase) -> bool {
-        let body = db.body(self.parent.into());
-        match &body[self.pat_id] {
-            Pat::Bind { mode, .. } => match mode {
-                BindingAnnotation::Mutable | BindingAnnotation::RefMut => true,
-                _ => false,
-            },
-            _ => false,
-        }
-    }
-
-    pub fn parent(self, _db: &dyn HirDatabase) -> DefWithBody {
-        self.parent.into()
-    }
-
-    pub fn module(self, db: &dyn HirDatabase) -> Module {
-        self.parent(db).module(db)
-    }
-
-    pub fn ty(self, db: &dyn HirDatabase) -> Type {
-        let def = DefWithBodyId::from(self.parent);
-        let infer = db.infer(def);
-        let ty = infer[self.pat_id].clone();
-        let krate = def.module(db.upcast()).krate();
-        Type::new(db, krate, def, ty)
-    }
-
-    pub fn source(self, db: &dyn HirDatabase) -> InFile<Either<ast::IdentPat, ast::SelfParam>> {
-        let (_body, source_map) = db.body_with_source_map(self.parent.into());
-        let src = source_map.pat_syntax(self.pat_id).unwrap(); // Hmm...
-        let root = src.file_syntax(db.upcast());
-        src.map(|ast| {
-            ast.map_left(|it| it.cast().unwrap().to_node(&root)).map_right(|it| it.to_node(&root))
-        })
-    }
-}
-
-#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
-pub struct Label {
-    pub(crate) parent: DefWithBodyId,
-    pub(crate) label_id: LabelId,
-}
-
-impl Label {
-    pub fn module(self, db: &dyn HirDatabase) -> Module {
-        self.parent(db).module(db)
-    }
-
-    pub fn parent(self, _db: &dyn HirDatabase) -> DefWithBody {
-        self.parent.into()
-    }
-
-    pub fn name(self, db: &dyn HirDatabase) -> Name {
-        let body = db.body(self.parent.into());
-        body[self.label_id].name.clone()
-    }
-
-    pub fn source(self, db: &dyn HirDatabase) -> InFile<ast::Label> {
-        let (_body, source_map) = db.body_with_source_map(self.parent.into());
-        let src = source_map.label_syntax(self.label_id);
-        let root = src.file_syntax(db.upcast());
-        src.map(|ast| ast.to_node(&root))
-    }
-}
-
-#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
-pub enum GenericParam {
-    TypeParam(TypeParam),
-    LifetimeParam(LifetimeParam),
-    ConstParam(ConstParam),
-}
-impl_from!(TypeParam, LifetimeParam, ConstParam for GenericParam);
-
-impl GenericParam {
-    pub fn module(self, db: &dyn HirDatabase) -> Module {
-        match self {
-            GenericParam::TypeParam(it) => it.module(db),
-            GenericParam::LifetimeParam(it) => it.module(db),
-            GenericParam::ConstParam(it) => it.module(db),
-        }
-    }
-
-    pub fn name(self, db: &dyn HirDatabase) -> Name {
-        match self {
-            GenericParam::TypeParam(it) => it.name(db),
-            GenericParam::LifetimeParam(it) => it.name(db),
-            GenericParam::ConstParam(it) => it.name(db),
-        }
-    }
-}
-
-#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
-pub struct TypeParam {
-    pub(crate) id: TypeParamId,
-}
-
-impl TypeParam {
-    pub fn name(self, db: &dyn HirDatabase) -> Name {
-        let params = db.generic_params(self.id.parent);
-        params.types[self.id.local_id].name.clone().unwrap_or_else(Name::missing)
-    }
-
-    pub fn module(self, db: &dyn HirDatabase) -> Module {
-        self.id.parent.module(db.upcast()).into()
-    }
-
-    pub fn ty(self, db: &dyn HirDatabase) -> Type {
-        let resolver = self.id.parent.resolver(db.upcast());
-        let environment = TraitEnvironment::lower(db, &resolver);
-        let ty = Ty::Placeholder(self.id);
-        Type {
-            krate: self.id.parent.module(db.upcast()).krate(),
-            ty: InEnvironment { value: ty, environment },
-        }
-    }
-
-    pub fn trait_bounds(self, db: &dyn HirDatabase) -> Vec<Trait> {
-        db.generic_predicates_for_param(self.id)
-            .into_iter()
-            .filter_map(|pred| match &pred.value {
-                hir_ty::GenericPredicate::Implemented(trait_ref) => {
-                    Some(Trait::from(trait_ref.trait_))
-                }
-                _ => None,
-            })
-            .collect()
-    }
-
-    pub fn default(self, db: &dyn HirDatabase) -> Option<Type> {
-        let params = db.generic_defaults(self.id.parent);
-        let local_idx = hir_ty::param_idx(db, self.id)?;
-        let resolver = self.id.parent.resolver(db.upcast());
-        let environment = TraitEnvironment::lower(db, &resolver);
-        let ty = params.get(local_idx)?.clone();
-        let subst = Substs::type_params(db, self.id.parent);
-        let ty = ty.subst(&subst.prefix(local_idx));
-        Some(Type {
-            krate: self.id.parent.module(db.upcast()).krate(),
-            ty: InEnvironment { value: ty, environment },
-        })
-    }
-}
-
-impl HirDisplay for TypeParam {
-    fn hir_fmt(&self, f: &mut HirFormatter) -> Result<(), HirDisplayError> {
-        write!(f, "{}", self.name(f.db))?;
-        let bounds = f.db.generic_predicates_for_param(self.id);
-        let substs = Substs::type_params(f.db, self.id.parent);
-        let predicates = bounds.iter().cloned().map(|b| b.subst(&substs)).collect::<Vec<_>>();
-        if !(predicates.is_empty() || f.omit_verbose_types()) {
-            write_bounds_like_dyn_trait_with_prefix(":", &predicates, f)?;
-        }
-        Ok(())
-    }
-}
-
-#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
-pub struct LifetimeParam {
-    pub(crate) id: LifetimeParamId,
-}
-
-impl LifetimeParam {
-    pub fn name(self, db: &dyn HirDatabase) -> Name {
-        let params = db.generic_params(self.id.parent);
-        params.lifetimes[self.id.local_id].name.clone()
-    }
-
-    pub fn module(self, db: &dyn HirDatabase) -> Module {
-        self.id.parent.module(db.upcast()).into()
-    }
-
-    pub fn parent(self, _db: &dyn HirDatabase) -> GenericDef {
-        self.id.parent.into()
-    }
-}
-
-#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
-pub struct ConstParam {
-    pub(crate) id: ConstParamId,
-}
-
-impl ConstParam {
-    pub fn name(self, db: &dyn HirDatabase) -> Name {
-        let params = db.generic_params(self.id.parent);
-        params.consts[self.id.local_id].name.clone()
-    }
-
-    pub fn module(self, db: &dyn HirDatabase) -> Module {
-        self.id.parent.module(db.upcast()).into()
-    }
-
-    pub fn parent(self, _db: &dyn HirDatabase) -> GenericDef {
-        self.id.parent.into()
-    }
-
-    pub fn ty(self, db: &dyn HirDatabase) -> Type {
-        let def = self.id.parent;
-        let krate = def.module(db.upcast()).krate();
-        Type::new(db, krate, def, db.const_param_ty(self.id))
-    }
-}
-
-#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
-pub struct Impl {
-    pub(crate) id: ImplId,
-}
-
-impl Impl {
-    pub fn all_in_crate(db: &dyn HirDatabase, krate: Crate) -> Vec<Impl> {
-        let inherent = db.inherent_impls_in_crate(krate.id);
-        let trait_ = db.trait_impls_in_crate(krate.id);
-
-        inherent.all_impls().chain(trait_.all_impls()).map(Self::from).collect()
-    }
-    pub fn for_trait(db: &dyn HirDatabase, krate: Crate, trait_: Trait) -> Vec<Impl> {
-        let impls = db.trait_impls_in_crate(krate.id);
-        impls.for_trait(trait_.id).map(Self::from).collect()
-    }
-
-    // FIXME: the return type is wrong. This should be a hir version of
-    // `TraitRef` (ie, resolved `TypeRef`).
-    pub fn target_trait(self, db: &dyn HirDatabase) -> Option<TypeRef> {
-        db.impl_data(self.id).target_trait.clone()
-    }
-
-    pub fn target_ty(self, db: &dyn HirDatabase) -> Type {
-        let impl_data = db.impl_data(self.id);
-        let resolver = self.id.resolver(db.upcast());
-        let ctx = hir_ty::TyLoweringContext::new(db, &resolver);
-        let environment = TraitEnvironment::lower(db, &resolver);
-        let ty = Ty::from_hir(&ctx, &impl_data.target_type);
-        Type {
-            krate: self.id.lookup(db.upcast()).container.module(db.upcast()).krate(),
-            ty: InEnvironment { value: ty, environment },
-        }
-    }
-
-    pub fn items(self, db: &dyn HirDatabase) -> Vec<AssocItem> {
-        db.impl_data(self.id).items.iter().map(|it| (*it).into()).collect()
-    }
-
-    pub fn is_negative(self, db: &dyn HirDatabase) -> bool {
-        db.impl_data(self.id).is_negative
-    }
-
-    pub fn module(self, db: &dyn HirDatabase) -> Module {
-        self.id.lookup(db.upcast()).container.module(db.upcast()).into()
-    }
-
-    pub fn krate(self, db: &dyn HirDatabase) -> Crate {
-        Crate { id: self.module(db).id.krate() }
-    }
-
-    pub fn is_builtin_derive(self, db: &dyn HirDatabase) -> Option<InFile<ast::Attr>> {
-        let src = self.source(db)?;
-        let item = src.file_id.is_builtin_derive(db.upcast())?;
-        let hygenic = hir_expand::hygiene::Hygiene::new(db.upcast(), item.file_id);
-
-        // FIXME: handle `cfg_attr`
-        let attr = item
-            .value
-            .attrs()
-            .filter_map(|it| {
-                let path = ModPath::from_src(it.path()?, &hygenic)?;
-                if path.as_ident()?.to_string() == "derive" {
-                    Some(it)
-                } else {
-                    None
-                }
-            })
-            .last()?;
-
-        Some(item.with_value(attr))
-    }
-}
-
-#[derive(Clone, PartialEq, Eq, Debug)]
-pub struct Type {
-    krate: CrateId,
-    ty: InEnvironment<Ty>,
-}
-
-impl Type {
-    pub(crate) fn new_with_resolver(
-        db: &dyn HirDatabase,
-        resolver: &Resolver,
-        ty: Ty,
-    ) -> Option<Type> {
-        let krate = resolver.krate()?;
-        Some(Type::new_with_resolver_inner(db, krate, resolver, ty))
-    }
-    pub(crate) fn new_with_resolver_inner(
-        db: &dyn HirDatabase,
-        krate: CrateId,
-        resolver: &Resolver,
-        ty: Ty,
-    ) -> Type {
-        let environment = TraitEnvironment::lower(db, &resolver);
-        Type { krate, ty: InEnvironment { value: ty, environment } }
-    }
-
-    fn new(db: &dyn HirDatabase, krate: CrateId, lexical_env: impl HasResolver, ty: Ty) -> Type {
-        let resolver = lexical_env.resolver(db.upcast());
-        let environment = TraitEnvironment::lower(db, &resolver);
-        Type { krate, ty: InEnvironment { value: ty, environment } }
-    }
-
-    fn from_def(
-        db: &dyn HirDatabase,
-        krate: CrateId,
-        def: impl HasResolver + Into<TyDefId> + Into<GenericDefId>,
-    ) -> Type {
-        let substs = Substs::build_for_def(db, def).fill_with_unknown().build();
-        let ty = db.ty(def.into()).subst(&substs);
-        Type::new(db, krate, def, ty)
-    }
-
-    pub fn is_unit(&self) -> bool {
-        matches!(self.ty.value, Ty::Tuple(0, ..))
-    }
-    pub fn is_bool(&self) -> bool {
-        matches!(self.ty.value, Ty::Scalar(Scalar::Bool))
-    }
-
-    pub fn is_mutable_reference(&self) -> bool {
-        matches!(self.ty.value, Ty::Ref(Mutability::Mut, ..))
-    }
-
-    pub fn remove_ref(&self) -> Option<Type> {
-        if let Ty::Ref(.., substs) = &self.ty.value {
-            Some(self.derived(substs[0].clone()))
-        } else {
-            None
-        }
-    }
-
-    pub fn is_unknown(&self) -> bool {
-        matches!(self.ty.value, Ty::Unknown)
-    }
-
-    /// Checks that particular type `ty` implements `std::future::Future`.
-    /// This function is used in `.await` syntax completion.
-    pub fn impls_future(&self, db: &dyn HirDatabase) -> bool {
-        // No special case for the type of async block, since Chalk can figure it out.
-
-        let krate = self.krate;
-
-        let std_future_trait =
-            db.lang_item(krate, "future_trait".into()).and_then(|it| it.as_trait());
-        let std_future_trait = match std_future_trait {
-            Some(it) => it,
-            None => return false,
-        };
-
-        let canonical_ty = Canonical { value: self.ty.value.clone(), kinds: Arc::new([]) };
-        method_resolution::implements_trait(
-            &canonical_ty,
-            db,
-            self.ty.environment.clone(),
-            krate,
-            std_future_trait,
-        )
-    }
-
-    /// Checks that particular type `ty` implements `std::ops::FnOnce`.
-    ///
-    /// This function can be used to check if a particular type is callable, since FnOnce is a
-    /// supertrait of Fn and FnMut, so all callable types implements at least FnOnce.
-    pub fn impls_fnonce(&self, db: &dyn HirDatabase) -> bool {
-        let krate = self.krate;
-
-        let fnonce_trait = match FnTrait::FnOnce.get_id(db, krate) {
-            Some(it) => it,
-            None => return false,
-        };
-
-        let canonical_ty = Canonical { value: self.ty.value.clone(), kinds: Arc::new([]) };
-        method_resolution::implements_trait_unique(
-            &canonical_ty,
-            db,
-            self.ty.environment.clone(),
-            krate,
-            fnonce_trait,
-        )
-    }
-
-    pub fn impls_trait(&self, db: &dyn HirDatabase, trait_: Trait, args: &[Type]) -> bool {
-        let trait_ref = hir_ty::TraitRef {
-            trait_: trait_.id,
-            substs: Substs::build_for_def(db, trait_.id)
-                .push(self.ty.value.clone())
-                .fill(args.iter().map(|t| t.ty.value.clone()))
-                .build(),
-        };
-
-        let goal = Canonical {
-            value: hir_ty::InEnvironment::new(
-                self.ty.environment.clone(),
-                hir_ty::Obligation::Trait(trait_ref),
-            ),
-            kinds: Arc::new([]),
-        };
-
-        db.trait_solve(self.krate, goal).is_some()
-    }
-
-    pub fn normalize_trait_assoc_type(
-        &self,
-        db: &dyn HirDatabase,
-        trait_: Trait,
-        args: &[Type],
-        alias: TypeAlias,
-    ) -> Option<Type> {
-        let subst = Substs::build_for_def(db, trait_.id)
-            .push(self.ty.value.clone())
-            .fill(args.iter().map(|t| t.ty.value.clone()))
-            .build();
-        let predicate = ProjectionPredicate {
-            projection_ty: ProjectionTy { associated_ty: alias.id, parameters: subst },
-            ty: Ty::BoundVar(BoundVar::new(DebruijnIndex::INNERMOST, 0)),
-        };
-        let goal = Canonical {
-            value: InEnvironment::new(
-                self.ty.environment.clone(),
-                Obligation::Projection(predicate),
-            ),
-            kinds: Arc::new([TyVariableKind::General]),
-        };
-
-        match db.trait_solve(self.krate, goal)? {
-            Solution::Unique(SolutionVariables(subst)) => subst.value.first().cloned(),
-            Solution::Ambig(_) => None,
-        }
-        .map(|ty| Type {
-            krate: self.krate,
-            ty: InEnvironment { value: ty, environment: Arc::clone(&self.ty.environment) },
-        })
-    }
-
-    pub fn is_copy(&self, db: &dyn HirDatabase) -> bool {
-        let lang_item = db.lang_item(self.krate, SmolStr::new("copy"));
-        let copy_trait = match lang_item {
-            Some(LangItemTarget::TraitId(it)) => it,
-            _ => return false,
-        };
-        self.impls_trait(db, copy_trait.into(), &[])
-    }
-
-    pub fn as_callable(&self, db: &dyn HirDatabase) -> Option<Callable> {
-        let def = match self.ty.value {
-            Ty::FnDef(def, _) => Some(def),
-            _ => None,
-        };
-
-        let sig = self.ty.value.callable_sig(db)?;
-        Some(Callable { ty: self.clone(), sig, def, is_bound_method: false })
-    }
-
-    pub fn is_closure(&self) -> bool {
-        matches!(&self.ty.value, Ty::Closure { .. })
-    }
-
-    pub fn is_fn(&self) -> bool {
-        matches!(&self.ty.value, Ty::FnDef(..) | Ty::Function { .. })
-    }
-
-    pub fn is_packed(&self, db: &dyn HirDatabase) -> bool {
-        let adt_id = match self.ty.value {
-            Ty::Adt(hir_ty::AdtId(adt_id), ..) => adt_id,
-            _ => return false,
-        };
-
-        let adt = adt_id.into();
-        match adt {
-            Adt::Struct(s) => matches!(s.repr(db), Some(ReprKind::Packed)),
-            _ => false,
-        }
-    }
-
-    pub fn is_raw_ptr(&self) -> bool {
-        matches!(&self.ty.value, Ty::Raw(..))
-    }
-
-    pub fn contains_unknown(&self) -> bool {
-        return go(&self.ty.value);
-
-        fn go(ty: &Ty) -> bool {
-            match ty {
-                Ty::Unknown => true,
-                _ => ty.substs().map_or(false, |substs| substs.iter().any(go)),
-            }
-        }
-    }
-
-    pub fn fields(&self, db: &dyn HirDatabase) -> Vec<(Field, Type)> {
-        let (variant_id, substs) = match self.ty.value {
-            Ty::Adt(hir_ty::AdtId(AdtId::StructId(s)), ref substs) => (s.into(), substs),
-            Ty::Adt(hir_ty::AdtId(AdtId::UnionId(u)), ref substs) => (u.into(), substs),
-            _ => return Vec::new(),
-        };
-
-        db.field_types(variant_id)
-            .iter()
-            .map(|(local_id, ty)| {
-                let def = Field { parent: variant_id.into(), id: local_id };
-                let ty = ty.clone().subst(substs);
-                (def, self.derived(ty))
-            })
-            .collect()
-    }
-
-    pub fn tuple_fields(&self, _db: &dyn HirDatabase) -> Vec<Type> {
-        if let Ty::Tuple(_, substs) = &self.ty.value {
-            substs.iter().map(|ty| self.derived(ty.clone())).collect()
-        } else {
-            Vec::new()
-        }
-    }
-
-    pub fn autoderef<'a>(&'a self, db: &'a dyn HirDatabase) -> impl Iterator<Item = Type> + 'a {
-        // There should be no inference vars in types passed here
-        // FIXME check that?
-        let canonical = Canonical { value: self.ty.value.clone(), kinds: Arc::new([]) };
-        let environment = self.ty.environment.clone();
-        let ty = InEnvironment { value: canonical, environment };
-        autoderef(db, Some(self.krate), ty)
-            .map(|canonical| canonical.value)
-            .map(move |ty| self.derived(ty))
-    }
-
-    // This would be nicer if it just returned an iterator, but that runs into
-    // lifetime problems, because we need to borrow temp `CrateImplDefs`.
-    pub fn iterate_assoc_items<T>(
-        self,
-        db: &dyn HirDatabase,
-        krate: Crate,
-        mut callback: impl FnMut(AssocItem) -> Option<T>,
-    ) -> Option<T> {
-        for krate in self.ty.value.def_crates(db, krate.id)? {
-            let impls = db.inherent_impls_in_crate(krate);
-
-            for impl_def in impls.for_self_ty(&self.ty.value) {
-                for &item in db.impl_data(*impl_def).items.iter() {
-                    if let Some(result) = callback(item.into()) {
-                        return Some(result);
-                    }
-                }
-            }
-        }
-        None
-    }
-
-    pub fn type_parameters(&self) -> impl Iterator<Item = Type> + '_ {
-        self.ty
-            .value
-            .strip_references()
-            .substs()
-            .into_iter()
-            .flat_map(|substs| substs.iter())
-            .map(move |ty| self.derived(ty.clone()))
-    }
-
-    pub fn iterate_method_candidates<T>(
-        &self,
-        db: &dyn HirDatabase,
-        krate: Crate,
-        traits_in_scope: &FxHashSet<TraitId>,
-        name: Option<&Name>,
-        mut callback: impl FnMut(&Ty, Function) -> Option<T>,
-    ) -> Option<T> {
-        // There should be no inference vars in types passed here
-        // FIXME check that?
-        // FIXME replace Unknown by bound vars here
-        let canonical = Canonical { value: self.ty.value.clone(), kinds: Arc::new([]) };
-
-        let env = self.ty.environment.clone();
-        let krate = krate.id;
-
-        method_resolution::iterate_method_candidates(
-            &canonical,
-            db,
-            env,
-            krate,
-            traits_in_scope,
-            name,
-            method_resolution::LookupMode::MethodCall,
-            |ty, it| match it {
-                AssocItemId::FunctionId(f) => callback(ty, f.into()),
-                _ => None,
-            },
-        )
-    }
-
-    pub fn iterate_path_candidates<T>(
-        &self,
-        db: &dyn HirDatabase,
-        krate: Crate,
-        traits_in_scope: &FxHashSet<TraitId>,
-        name: Option<&Name>,
-        mut callback: impl FnMut(&Ty, AssocItem) -> Option<T>,
-    ) -> Option<T> {
-        // There should be no inference vars in types passed here
-        // FIXME check that?
-        // FIXME replace Unknown by bound vars here
-        let canonical = Canonical { value: self.ty.value.clone(), kinds: Arc::new([]) };
-
-        let env = self.ty.environment.clone();
-        let krate = krate.id;
-
-        method_resolution::iterate_method_candidates(
-            &canonical,
-            db,
-            env,
-            krate,
-            traits_in_scope,
-            name,
-            method_resolution::LookupMode::Path,
-            |ty, it| callback(ty, it.into()),
-        )
-    }
-
-    pub fn as_adt(&self) -> Option<Adt> {
-        let (adt, _subst) = self.ty.value.as_adt()?;
-        Some(adt.into())
-    }
-
-    pub fn as_dyn_trait(&self) -> Option<Trait> {
-        self.ty.value.dyn_trait().map(Into::into)
-    }
-
-    pub fn as_impl_traits(&self, db: &dyn HirDatabase) -> Option<Vec<Trait>> {
-        self.ty.value.impl_trait_bounds(db).map(|it| {
-            it.into_iter()
-                .filter_map(|pred| match pred {
-                    hir_ty::GenericPredicate::Implemented(trait_ref) => {
-                        Some(Trait::from(trait_ref.trait_))
-                    }
-                    _ => None,
-                })
-                .collect()
-        })
-    }
-
-    pub fn as_associated_type_parent_trait(&self, db: &dyn HirDatabase) -> Option<Trait> {
-        self.ty.value.associated_type_parent_trait(db).map(Into::into)
-    }
-
-    // FIXME: provide required accessors such that it becomes implementable from outside.
-    pub fn is_equal_for_find_impls(&self, other: &Type) -> bool {
-        let rref = other.remove_ref();
-        self.ty.value.equals_ctor(rref.as_ref().map_or(&other.ty.value, |it| &it.ty.value))
-    }
-
-    fn derived(&self, ty: Ty) -> Type {
-        Type {
-            krate: self.krate,
-            ty: InEnvironment { value: ty, environment: self.ty.environment.clone() },
-        }
-    }
-
-    pub fn walk(&self, db: &dyn HirDatabase, mut cb: impl FnMut(Type)) {
-        // TypeWalk::walk for a Ty at first visits parameters and only after that the Ty itself.
-        // We need a different order here.
-
-        fn walk_substs(
-            db: &dyn HirDatabase,
-            type_: &Type,
-            substs: &Substs,
-            cb: &mut impl FnMut(Type),
-        ) {
-            for ty in substs.iter() {
-                walk_type(db, &type_.derived(ty.clone()), cb);
-            }
-        }
-
-        fn walk_bounds(
-            db: &dyn HirDatabase,
-            type_: &Type,
-            bounds: &[GenericPredicate],
-            cb: &mut impl FnMut(Type),
-        ) {
-            for pred in bounds {
-                match pred {
-                    GenericPredicate::Implemented(trait_ref) => {
-                        cb(type_.clone());
-                        walk_substs(db, type_, &trait_ref.substs, cb);
-                    }
-                    _ => (),
-                }
-            }
-        }
-
-        fn walk_type(db: &dyn HirDatabase, type_: &Type, cb: &mut impl FnMut(Type)) {
-            let ty = type_.ty.value.strip_references();
-            match ty {
-                Ty::Adt(..) => {
-                    cb(type_.derived(ty.clone()));
-                }
-                Ty::AssociatedType(..) => {
-                    if let Some(_) = ty.associated_type_parent_trait(db) {
-                        cb(type_.derived(ty.clone()));
-                    }
-                }
-                Ty::OpaqueType(..) => {
-                    if let Some(bounds) = ty.impl_trait_bounds(db) {
-                        walk_bounds(db, &type_.derived(ty.clone()), &bounds, cb);
-                    }
-                }
-                Ty::Alias(AliasTy::Opaque(opaque_ty)) => {
-                    if let Some(bounds) = ty.impl_trait_bounds(db) {
-                        walk_bounds(db, &type_.derived(ty.clone()), &bounds, cb);
-                    }
-
-                    walk_substs(db, type_, &opaque_ty.parameters, cb);
-                }
-                Ty::Placeholder(_) => {
-                    if let Some(bounds) = ty.impl_trait_bounds(db) {
-                        walk_bounds(db, &type_.derived(ty.clone()), &bounds, cb);
-                    }
-                }
-                Ty::Dyn(bounds) => {
-                    walk_bounds(db, &type_.derived(ty.clone()), bounds.as_ref(), cb);
-                }
-
-                _ => {}
-            }
-            if let Some(substs) = ty.substs() {
-                walk_substs(db, type_, &substs, cb);
-            }
-        }
-
-        walk_type(db, self, &mut cb);
-    }
-}
-
-impl HirDisplay for Type {
-    fn hir_fmt(&self, f: &mut HirFormatter) -> Result<(), HirDisplayError> {
-        self.ty.value.hir_fmt(f)
-    }
-}
-
-// FIXME: closures
-#[derive(Debug)]
-pub struct Callable {
-    ty: Type,
-    sig: CallableSig,
-    def: Option<CallableDefId>,
-    pub(crate) is_bound_method: bool,
-}
-
-pub enum CallableKind {
-    Function(Function),
-    TupleStruct(Struct),
-    TupleEnumVariant(Variant),
-    Closure,
-}
-
-impl Callable {
-    pub fn kind(&self) -> CallableKind {
-        match self.def {
-            Some(CallableDefId::FunctionId(it)) => CallableKind::Function(it.into()),
-            Some(CallableDefId::StructId(it)) => CallableKind::TupleStruct(it.into()),
-            Some(CallableDefId::EnumVariantId(it)) => CallableKind::TupleEnumVariant(it.into()),
-            None => CallableKind::Closure,
-        }
-    }
-    pub fn receiver_param(&self, db: &dyn HirDatabase) -> Option<ast::SelfParam> {
-        let func = match self.def {
-            Some(CallableDefId::FunctionId(it)) if self.is_bound_method => it,
-            _ => return None,
-        };
-        let src = func.lookup(db.upcast()).source(db.upcast());
-        let param_list = src.value.param_list()?;
-        param_list.self_param()
-    }
-    pub fn n_params(&self) -> usize {
-        self.sig.params().len() - if self.is_bound_method { 1 } else { 0 }
-    }
-    pub fn params(
-        &self,
-        db: &dyn HirDatabase,
-    ) -> Vec<(Option<Either<ast::SelfParam, ast::Pat>>, Type)> {
-        let types = self
-            .sig
-            .params()
-            .iter()
-            .skip(if self.is_bound_method { 1 } else { 0 })
-            .map(|ty| self.ty.derived(ty.clone()));
-        let patterns = match self.def {
-            Some(CallableDefId::FunctionId(func)) => {
-                let src = func.lookup(db.upcast()).source(db.upcast());
-                src.value.param_list().map(|param_list| {
-                    param_list
-                        .self_param()
-                        .map(|it| Some(Either::Left(it)))
-                        .filter(|_| !self.is_bound_method)
-                        .into_iter()
-                        .chain(param_list.params().map(|it| it.pat().map(Either::Right)))
-                })
-            }
-            _ => None,
-        };
-        patterns.into_iter().flatten().chain(iter::repeat(None)).zip(types).collect()
-    }
-    pub fn return_type(&self) -> Type {
-        self.ty.derived(self.sig.ret().clone())
-    }
-}
-
-/// For IDE only
-#[derive(Debug, PartialEq, Eq, Hash)]
-pub enum ScopeDef {
-    ModuleDef(ModuleDef),
-    MacroDef(MacroDef),
-    GenericParam(GenericParam),
-    ImplSelfType(Impl),
-    AdtSelfType(Adt),
-    Local(Local),
-    Unknown,
-}
-
-impl ScopeDef {
-    pub fn all_items(def: PerNs) -> ArrayVec<[Self; 3]> {
-        let mut items = ArrayVec::new();
-
-        match (def.take_types(), def.take_values()) {
-            (Some(m1), None) => items.push(ScopeDef::ModuleDef(m1.into())),
-            (None, Some(m2)) => items.push(ScopeDef::ModuleDef(m2.into())),
-            (Some(m1), Some(m2)) => {
-                // Some items, like unit structs and enum variants, are
-                // returned as both a type and a value. Here we want
-                // to de-duplicate them.
-                if m1 != m2 {
-                    items.push(ScopeDef::ModuleDef(m1.into()));
-                    items.push(ScopeDef::ModuleDef(m2.into()));
-                } else {
-                    items.push(ScopeDef::ModuleDef(m1.into()));
-                }
-            }
-            (None, None) => {}
-        };
-
-        if let Some(macro_def_id) = def.take_macros() {
-            items.push(ScopeDef::MacroDef(macro_def_id.into()));
-        }
-
-        if items.is_empty() {
-            items.push(ScopeDef::Unknown);
-        }
-
-        items
-    }
-}
-
-pub trait HasVisibility {
-    fn visibility(&self, db: &dyn HirDatabase) -> Visibility;
-    fn is_visible_from(&self, db: &dyn HirDatabase, module: Module) -> bool {
-        let vis = self.visibility(db);
-        vis.is_visible_from(db.upcast(), module.id)
-    }
-}
diff --git a/crates/hir/src/from_id.rs b/crates/hir/src/from_id.rs
index b5814da11..179b9d51e 100644
--- a/crates/hir/src/from_id.rs
+++ b/crates/hir/src/from_id.rs
@@ -11,9 +11,8 @@ use hir_def::{
 };
 
 use crate::{
-    code_model::{BuiltinType, GenericParam},
-    Adt, AssocItem, DefWithBody, Field, GenericDef, Label, Local, MacroDef, ModuleDef, Variant,
-    VariantDef,
+    Adt, AssocItem, BuiltinType, DefWithBody, Field, GenericDef, GenericParam, Label, Local,
+    MacroDef, ModuleDef, Variant, VariantDef,
 };
 
 macro_rules! from_id {
diff --git a/crates/hir/src/lib.rs b/crates/hir/src/lib.rs
index 69fcdab07..58adc8fd3 100644
--- a/crates/hir/src/lib.rs
+++ b/crates/hir/src/lib.rs
@@ -20,49 +20,2117 @@
 #![recursion_limit = "512"]
 
 mod semantics;
-pub mod db;
 mod source_analyzer;
 
-pub mod diagnostics;
-
 mod from_id;
-mod code_model;
 mod attrs;
 mod has_source;
 
+pub mod diagnostics;
+pub mod db;
+
+use std::{iter, sync::Arc};
+
+use arrayvec::ArrayVec;
+use base_db::{CrateDisplayName, CrateId, Edition, FileId};
+use either::Either;
+use hir_def::{
+    adt::{ReprKind, VariantData},
+    expr::{BindingAnnotation, LabelId, Pat, PatId},
+    item_tree::ItemTreeNode,
+    lang_item::LangItemTarget,
+    per_ns::PerNs,
+    resolver::{HasResolver, Resolver},
+    src::HasSource as _,
+    AdtId, AssocContainerId, AssocItemId, AssocItemLoc, AttrDefId, ConstId, ConstParamId,
+    DefWithBodyId, EnumId, FunctionId, GenericDefId, HasModule, ImplId, LifetimeParamId,
+    LocalEnumVariantId, LocalFieldId, Lookup, ModuleId, StaticId, StructId, TraitId, TypeAliasId,
+    TypeParamId, UnionId,
+};
+use hir_expand::{diagnostics::DiagnosticSink, name::name, MacroDefKind};
+use hir_ty::{
+    autoderef,
+    display::{write_bounds_like_dyn_trait_with_prefix, HirDisplayError, HirFormatter},
+    method_resolution,
+    traits::{FnTrait, Solution, SolutionVariables},
+    AliasTy, BoundVar, CallableDefId, CallableSig, Canonical, DebruijnIndex, GenericPredicate,
+    InEnvironment, Obligation, ProjectionPredicate, ProjectionTy, Scalar, Substs, TraitEnvironment,
+    Ty, TyDefId, TyVariableKind,
+};
+use rustc_hash::FxHashSet;
+use stdx::{format_to, impl_from};
+use syntax::{
+    ast::{self, AttrsOwner, NameOwner},
+    AstNode, SmolStr,
+};
+use tt::{Ident, Leaf, Literal, TokenTree};
+
+use crate::db::{DefDatabase, HirDatabase};
+
 pub use crate::{
     attrs::{HasAttrs, Namespace},
-    code_model::{
-        Access, Adt, AsAssocItem, AssocItem, AssocItemContainer, BuiltinType, Callable,
-        CallableKind, Const, ConstParam, Crate, CrateDependency, DefWithBody, Enum, Field,
-        FieldSource, Function, GenericDef, GenericParam, HasVisibility, Impl, Label, LifetimeParam,
-        Local, MacroDef, Module, ModuleDef, ScopeDef, Static, Struct, Trait, Type, TypeAlias,
-        TypeParam, Union, Variant, VariantDef,
-    },
     has_source::HasSource,
     semantics::{PathResolution, Semantics, SemanticsScope},
 };
 
-pub use hir_def::{
-    adt::StructKind,
-    attr::{Attrs, Documentation},
-    body::scope::ExprScopes,
-    find_path::PrefixKind,
-    import_map,
-    item_scope::ItemInNs,
-    nameres::ModuleSource,
-    path::{ModPath, PathKind},
-    type_ref::{Mutability, TypeRef},
-    visibility::Visibility,
-};
-pub use hir_expand::{
-    name::{known, AsName, Name},
-    ExpandResult, HirFileId, InFile, MacroCallId, MacroCallLoc, /* FIXME */ MacroDefId,
-    MacroFile, Origin,
+// Be careful with these re-exports.
+//
+// `hir` is the boundary between the compiler and the IDE. It should try hard to
+// isolate the compiler from the ide, to allow the two to be refactored
+// independently. Re-exporting something from the compiler is the sure way to
+// breach the boundary.
+//
+// Generally, a refactoring which *removes* a name from this list is a good
+// idea!
+pub use {
+    hir_def::{
+        adt::StructKind,
+        attr::{Attrs, Documentation},
+        body::scope::ExprScopes,
+        find_path::PrefixKind,
+        import_map,
+        item_scope::ItemInNs,
+        nameres::ModuleSource,
+        path::{ModPath, PathKind},
+        type_ref::{Mutability, TypeRef},
+        visibility::Visibility,
+    },
+    hir_expand::{
+        name::{known, Name},
+        ExpandResult, HirFileId, InFile, MacroCallId, MacroCallLoc, /* FIXME */ MacroDefId,
+        MacroFile, Origin,
+    },
+    hir_ty::display::HirDisplay,
 };
-pub use hir_ty::display::HirDisplay;
 
 // These are negative re-exports: pub using these names is forbidden, they
 // should remain private to hir internals.
 #[allow(unused)]
-use {hir_def::path::Path, hir_expand::hygiene::Hygiene};
+use {
+    hir_def::path::Path,
+    hir_expand::{hygiene::Hygiene, name::AsName},
+};
+
+/// hir::Crate describes a single crate. It's the main interface with which
+/// a crate's dependencies interact. Mostly, it should be just a proxy for the
+/// root module.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+pub struct Crate {
+    pub(crate) id: CrateId,
+}
+
+#[derive(Debug)]
+pub struct CrateDependency {
+    pub krate: Crate,
+    pub name: Name,
+}
+
+impl Crate {
+    pub fn dependencies(self, db: &dyn HirDatabase) -> Vec<CrateDependency> {
+        db.crate_graph()[self.id]
+            .dependencies
+            .iter()
+            .map(|dep| {
+                let krate = Crate { id: dep.crate_id };
+                let name = dep.as_name();
+                CrateDependency { krate, name }
+            })
+            .collect()
+    }
+
+    // FIXME: add `transitive_reverse_dependencies`.
+    pub fn reverse_dependencies(self, db: &dyn HirDatabase) -> Vec<Crate> {
+        let crate_graph = db.crate_graph();
+        crate_graph
+            .iter()
+            .filter(|&krate| {
+                crate_graph[krate].dependencies.iter().any(|it| it.crate_id == self.id)
+            })
+            .map(|id| Crate { id })
+            .collect()
+    }
+
+    pub fn root_module(self, db: &dyn HirDatabase) -> Module {
+        let def_map = db.crate_def_map(self.id);
+        Module { id: def_map.module_id(def_map.root()) }
+    }
+
+    pub fn root_file(self, db: &dyn HirDatabase) -> FileId {
+        db.crate_graph()[self.id].root_file_id
+    }
+
+    pub fn edition(self, db: &dyn HirDatabase) -> Edition {
+        db.crate_graph()[self.id].edition
+    }
+
+    pub fn display_name(self, db: &dyn HirDatabase) -> Option<CrateDisplayName> {
+        db.crate_graph()[self.id].display_name.clone()
+    }
+
+    pub fn query_external_importables(
+        self,
+        db: &dyn DefDatabase,
+        query: import_map::Query,
+    ) -> impl Iterator<Item = Either<ModuleDef, MacroDef>> {
+        import_map::search_dependencies(db, self.into(), query).into_iter().map(|item| match item {
+            ItemInNs::Types(mod_id) | ItemInNs::Values(mod_id) => Either::Left(mod_id.into()),
+            ItemInNs::Macros(mac_id) => Either::Right(mac_id.into()),
+        })
+    }
+
+    pub fn all(db: &dyn HirDatabase) -> Vec<Crate> {
+        db.crate_graph().iter().map(|id| Crate { id }).collect()
+    }
+
+    /// Try to get the root URL of the documentation of a crate.
+    pub fn get_html_root_url(self: &Crate, db: &dyn HirDatabase) -> Option<String> {
+        // Look for #![doc(html_root_url = "...")]
+        let attrs = db.attrs(AttrDefId::ModuleId(self.root_module(db).into()));
+        let doc_attr_q = attrs.by_key("doc");
+
+        if !doc_attr_q.exists() {
+            return None;
+        }
+
+        let doc_url = doc_attr_q.tt_values().map(|tt| {
+            let name = tt.token_trees.iter()
+                .skip_while(|tt| !matches!(tt, TokenTree::Leaf(Leaf::Ident(Ident{text: ref ident, ..})) if ident == "html_root_url"))
+                .skip(2)
+                .next();
+
+            match name {
+                Some(TokenTree::Leaf(Leaf::Literal(Literal{ref text, ..}))) => Some(text),
+                _ => None
+            }
+        }).flat_map(|t| t).next();
+
+        doc_url.map(|s| s.trim_matches('"').trim_end_matches('/').to_owned() + "/")
+    }
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+pub struct Module {
+    pub(crate) id: ModuleId,
+}
+
+/// The defs which can be visible in the module.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+pub enum ModuleDef {
+    Module(Module),
+    Function(Function),
+    Adt(Adt),
+    // Can't be directly declared, but can be imported.
+    Variant(Variant),
+    Const(Const),
+    Static(Static),
+    Trait(Trait),
+    TypeAlias(TypeAlias),
+    BuiltinType(BuiltinType),
+}
+impl_from!(
+    Module,
+    Function,
+    Adt(Struct, Enum, Union),
+    Variant,
+    Const,
+    Static,
+    Trait,
+    TypeAlias,
+    BuiltinType
+    for ModuleDef
+);
+
+impl From<VariantDef> for ModuleDef {
+    fn from(var: VariantDef) -> Self {
+        match var {
+            VariantDef::Struct(t) => Adt::from(t).into(),
+            VariantDef::Union(t) => Adt::from(t).into(),
+            VariantDef::Variant(t) => t.into(),
+        }
+    }
+}
+
+impl ModuleDef {
+    pub fn module(self, db: &dyn HirDatabase) -> Option<Module> {
+        match self {
+            ModuleDef::Module(it) => it.parent(db),
+            ModuleDef::Function(it) => Some(it.module(db)),
+            ModuleDef::Adt(it) => Some(it.module(db)),
+            ModuleDef::Variant(it) => Some(it.module(db)),
+            ModuleDef::Const(it) => Some(it.module(db)),
+            ModuleDef::Static(it) => Some(it.module(db)),
+            ModuleDef::Trait(it) => Some(it.module(db)),
+            ModuleDef::TypeAlias(it) => Some(it.module(db)),
+            ModuleDef::BuiltinType(_) => None,
+        }
+    }
+
+    pub fn canonical_path(&self, db: &dyn HirDatabase) -> Option<String> {
+        let mut segments = Vec::new();
+        segments.push(self.name(db)?.to_string());
+        for m in self.module(db)?.path_to_root(db) {
+            segments.extend(m.name(db).map(|it| it.to_string()))
+        }
+        segments.reverse();
+        Some(segments.join("::"))
+    }
+
+    pub fn definition_visibility(&self, db: &dyn HirDatabase) -> Option<Visibility> {
+        let module = match self {
+            ModuleDef::Module(it) => it.parent(db)?,
+            ModuleDef::Function(it) => return Some(it.visibility(db)),
+            ModuleDef::Adt(it) => it.module(db),
+            ModuleDef::Variant(it) => {
+                let parent = it.parent_enum(db);
+                let module = it.module(db);
+                return module.visibility_of(db, &ModuleDef::Adt(Adt::Enum(parent)));
+            }
+            ModuleDef::Const(it) => return Some(it.visibility(db)),
+            ModuleDef::Static(it) => it.module(db),
+            ModuleDef::Trait(it) => it.module(db),
+            ModuleDef::TypeAlias(it) => return Some(it.visibility(db)),
+            ModuleDef::BuiltinType(_) => return None,
+        };
+
+        module.visibility_of(db, self)
+    }
+
+    pub fn name(self, db: &dyn HirDatabase) -> Option<Name> {
+        match self {
+            ModuleDef::Adt(it) => Some(it.name(db)),
+            ModuleDef::Trait(it) => Some(it.name(db)),
+            ModuleDef::Function(it) => Some(it.name(db)),
+            ModuleDef::Variant(it) => Some(it.name(db)),
+            ModuleDef::TypeAlias(it) => Some(it.name(db)),
+            ModuleDef::Module(it) => it.name(db),
+            ModuleDef::Const(it) => it.name(db),
+            ModuleDef::Static(it) => it.name(db),
+            ModuleDef::BuiltinType(it) => Some(it.name()),
+        }
+    }
+
+    pub fn diagnostics(self, db: &dyn HirDatabase, sink: &mut DiagnosticSink) {
+        let id = match self {
+            ModuleDef::Adt(it) => match it {
+                Adt::Struct(it) => it.id.into(),
+                Adt::Enum(it) => it.id.into(),
+                Adt::Union(it) => it.id.into(),
+            },
+            ModuleDef::Trait(it) => it.id.into(),
+            ModuleDef::Function(it) => it.id.into(),
+            ModuleDef::TypeAlias(it) => it.id.into(),
+            ModuleDef::Module(it) => it.id.into(),
+            ModuleDef::Const(it) => it.id.into(),
+            ModuleDef::Static(it) => it.id.into(),
+            _ => return,
+        };
+
+        let module = match self.module(db) {
+            Some(it) => it,
+            None => return,
+        };
+
+        hir_ty::diagnostics::validate_module_item(db, module.id.krate(), id, sink)
+    }
+}
+
+impl Module {
+    /// Name of this module.
+    pub fn name(self, db: &dyn HirDatabase) -> Option<Name> {
+        let def_map = self.id.def_map(db.upcast());
+        let parent = def_map[self.id.local_id].parent?;
+        def_map[parent].children.iter().find_map(|(name, module_id)| {
+            if *module_id == self.id.local_id {
+                Some(name.clone())
+            } else {
+                None
+            }
+        })
+    }
+
+    /// Returns the crate this module is part of.
+    pub fn krate(self) -> Crate {
+        Crate { id: self.id.krate() }
+    }
+
+    /// Topmost parent of this module. Every module has a `crate_root`, but some
+    /// might be missing `krate`. This can happen if a module's file is not included
+    /// in the module tree of any target in `Cargo.toml`.
+    pub fn crate_root(self, db: &dyn HirDatabase) -> Module {
+        let def_map = db.crate_def_map(self.id.krate());
+        Module { id: def_map.module_id(def_map.root()) }
+    }
+
+    /// Iterates over all child modules.
+    pub fn children(self, db: &dyn HirDatabase) -> impl Iterator<Item = Module> {
+        let def_map = self.id.def_map(db.upcast());
+        let children = def_map[self.id.local_id]
+            .children
+            .iter()
+            .map(|(_, module_id)| Module { id: def_map.module_id(*module_id) })
+            .collect::<Vec<_>>();
+        children.into_iter()
+    }
+
+    /// Finds a parent module.
+    pub fn parent(self, db: &dyn HirDatabase) -> Option<Module> {
+        // FIXME: handle block expressions as modules (their parent is in a different DefMap)
+        let def_map = self.id.def_map(db.upcast());
+        let parent_id = def_map[self.id.local_id].parent?;
+        Some(Module { id: def_map.module_id(parent_id) })
+    }
+
+    pub fn path_to_root(self, db: &dyn HirDatabase) -> Vec<Module> {
+        let mut res = vec![self];
+        let mut curr = self;
+        while let Some(next) = curr.parent(db) {
+            res.push(next);
+            curr = next
+        }
+        res
+    }
+
+    /// Returns a `ModuleScope`: a set of items, visible in this module.
+    pub fn scope(
+        self,
+        db: &dyn HirDatabase,
+        visible_from: Option<Module>,
+    ) -> Vec<(Name, ScopeDef)> {
+        self.id.def_map(db.upcast())[self.id.local_id]
+            .scope
+            .entries()
+            .filter_map(|(name, def)| {
+                if let Some(m) = visible_from {
+                    let filtered =
+                        def.filter_visibility(|vis| vis.is_visible_from(db.upcast(), m.id));
+                    if filtered.is_none() && !def.is_none() {
+                        None
+                    } else {
+                        Some((name, filtered))
+                    }
+                } else {
+                    Some((name, def))
+                }
+            })
+            .flat_map(|(name, def)| {
+                ScopeDef::all_items(def).into_iter().map(move |item| (name.clone(), item))
+            })
+            .collect()
+    }
+
+    pub fn visibility_of(self, db: &dyn HirDatabase, def: &ModuleDef) -> Option<Visibility> {
+        self.id.def_map(db.upcast())[self.id.local_id].scope.visibility_of(def.clone().into())
+    }
+
+    pub fn diagnostics(self, db: &dyn HirDatabase, sink: &mut DiagnosticSink) {
+        let _p = profile::span("Module::diagnostics").detail(|| {
+            format!("{:?}", self.name(db).map_or("<unknown>".into(), |name| name.to_string()))
+        });
+        let def_map = self.id.def_map(db.upcast());
+        def_map.add_diagnostics(db.upcast(), self.id.local_id, sink);
+        for decl in self.declarations(db) {
+            match decl {
+                crate::ModuleDef::Function(f) => f.diagnostics(db, sink),
+                crate::ModuleDef::Module(m) => {
+                    // Only add diagnostics from inline modules
+                    if def_map[m.id.local_id].origin.is_inline() {
+                        m.diagnostics(db, sink)
+                    }
+                }
+                _ => {
+                    decl.diagnostics(db, sink);
+                }
+            }
+        }
+
+        for impl_def in self.impl_defs(db) {
+            for item in impl_def.items(db) {
+                if let AssocItem::Function(f) = item {
+                    f.diagnostics(db, sink);
+                }
+            }
+        }
+    }
+
+    pub fn declarations(self, db: &dyn HirDatabase) -> Vec<ModuleDef> {
+        let def_map = self.id.def_map(db.upcast());
+        def_map[self.id.local_id].scope.declarations().map(ModuleDef::from).collect()
+    }
+
+    pub fn impl_defs(self, db: &dyn HirDatabase) -> Vec<Impl> {
+        let def_map = self.id.def_map(db.upcast());
+        def_map[self.id.local_id].scope.impls().map(Impl::from).collect()
+    }
+
+    /// Finds a path that can be used to refer to the given item from within
+    /// this module, if possible.
+    pub fn find_use_path(self, db: &dyn DefDatabase, item: impl Into<ItemInNs>) -> Option<ModPath> {
+        hir_def::find_path::find_path(db, item.into(), self.into())
+    }
+
+    /// Finds a path that can be used to refer to the given item from within
+    /// this module, if possible. This is used for returning import paths for use-statements.
+    pub fn find_use_path_prefixed(
+        self,
+        db: &dyn DefDatabase,
+        item: impl Into<ItemInNs>,
+        prefix_kind: PrefixKind,
+    ) -> Option<ModPath> {
+        hir_def::find_path::find_path_prefixed(db, item.into(), self.into(), prefix_kind)
+    }
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+pub struct Field {
+    pub(crate) parent: VariantDef,
+    pub(crate) id: LocalFieldId,
+}
+
+#[derive(Debug, PartialEq, Eq)]
+pub enum FieldSource {
+    Named(ast::RecordField),
+    Pos(ast::TupleField),
+}
+
+impl Field {
+    pub fn name(&self, db: &dyn HirDatabase) -> Name {
+        self.parent.variant_data(db).fields()[self.id].name.clone()
+    }
+
+    /// Returns the type as in the signature of the struct (i.e., with
+    /// placeholder types for type parameters). This is good for showing
+    /// signature help, but not so good to actually get the type of the field
+    /// when you actually have a variable of the struct.
+    pub fn signature_ty(&self, db: &dyn HirDatabase) -> Type {
+        let var_id = self.parent.into();
+        let generic_def_id: GenericDefId = match self.parent {
+            VariantDef::Struct(it) => it.id.into(),
+            VariantDef::Union(it) => it.id.into(),
+            VariantDef::Variant(it) => it.parent.id.into(),
+        };
+        let substs = Substs::type_params(db, generic_def_id);
+        let ty = db.field_types(var_id)[self.id].clone().subst(&substs);
+        Type::new(db, self.parent.module(db).id.krate(), var_id, ty)
+    }
+
+    pub fn parent_def(&self, _db: &dyn HirDatabase) -> VariantDef {
+        self.parent
+    }
+}
+
+impl HasVisibility for Field {
+    fn visibility(&self, db: &dyn HirDatabase) -> Visibility {
+        let variant_data = self.parent.variant_data(db);
+        let visibility = &variant_data.fields()[self.id].visibility;
+        let parent_id: hir_def::VariantId = self.parent.into();
+        visibility.resolve(db.upcast(), &parent_id.resolver(db.upcast()))
+    }
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+pub struct Struct {
+    pub(crate) id: StructId,
+}
+
+impl Struct {
+    pub fn module(self, db: &dyn HirDatabase) -> Module {
+        Module { id: self.id.lookup(db.upcast()).container }
+    }
+
+    pub fn krate(self, db: &dyn HirDatabase) -> Option<Crate> {
+        Some(self.module(db).krate())
+    }
+
+    pub fn name(self, db: &dyn HirDatabase) -> Name {
+        db.struct_data(self.id).name.clone()
+    }
+
+    pub fn fields(self, db: &dyn HirDatabase) -> Vec<Field> {
+        db.struct_data(self.id)
+            .variant_data
+            .fields()
+            .iter()
+            .map(|(id, _)| Field { parent: self.into(), id })
+            .collect()
+    }
+
+    pub fn ty(self, db: &dyn HirDatabase) -> Type {
+        Type::from_def(db, self.id.lookup(db.upcast()).container.krate(), self.id)
+    }
+
+    pub fn repr(self, db: &dyn HirDatabase) -> Option<ReprKind> {
+        db.struct_data(self.id).repr.clone()
+    }
+
+    pub fn kind(self, db: &dyn HirDatabase) -> StructKind {
+        self.variant_data(db).kind()
+    }
+
+    fn variant_data(self, db: &dyn HirDatabase) -> Arc<VariantData> {
+        db.struct_data(self.id).variant_data.clone()
+    }
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+pub struct Union {
+    pub(crate) id: UnionId,
+}
+
+impl Union {
+    pub fn name(self, db: &dyn HirDatabase) -> Name {
+        db.union_data(self.id).name.clone()
+    }
+
+    pub fn module(self, db: &dyn HirDatabase) -> Module {
+        Module { id: self.id.lookup(db.upcast()).container }
+    }
+
+    pub fn ty(self, db: &dyn HirDatabase) -> Type {
+        Type::from_def(db, self.id.lookup(db.upcast()).container.krate(), self.id)
+    }
+
+    pub fn fields(self, db: &dyn HirDatabase) -> Vec<Field> {
+        db.union_data(self.id)
+            .variant_data
+            .fields()
+            .iter()
+            .map(|(id, _)| Field { parent: self.into(), id })
+            .collect()
+    }
+
+    fn variant_data(self, db: &dyn HirDatabase) -> Arc<VariantData> {
+        db.union_data(self.id).variant_data.clone()
+    }
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+pub struct Enum {
+    pub(crate) id: EnumId,
+}
+
+impl Enum {
+    pub fn module(self, db: &dyn HirDatabase) -> Module {
+        Module { id: self.id.lookup(db.upcast()).container }
+    }
+
+    pub fn krate(self, db: &dyn HirDatabase) -> Option<Crate> {
+        Some(self.module(db).krate())
+    }
+
+    pub fn name(self, db: &dyn HirDatabase) -> Name {
+        db.enum_data(self.id).name.clone()
+    }
+
+    pub fn variants(self, db: &dyn HirDatabase) -> Vec<Variant> {
+        db.enum_data(self.id).variants.iter().map(|(id, _)| Variant { parent: self, id }).collect()
+    }
+
+    pub fn ty(self, db: &dyn HirDatabase) -> Type {
+        Type::from_def(db, self.id.lookup(db.upcast()).container.krate(), self.id)
+    }
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+pub struct Variant {
+    pub(crate) parent: Enum,
+    pub(crate) id: LocalEnumVariantId,
+}
+
+impl Variant {
+    pub fn module(self, db: &dyn HirDatabase) -> Module {
+        self.parent.module(db)
+    }
+    pub fn parent_enum(self, _db: &dyn HirDatabase) -> Enum {
+        self.parent
+    }
+
+    pub fn name(self, db: &dyn HirDatabase) -> Name {
+        db.enum_data(self.parent.id).variants[self.id].name.clone()
+    }
+
+    pub fn fields(self, db: &dyn HirDatabase) -> Vec<Field> {
+        self.variant_data(db)
+            .fields()
+            .iter()
+            .map(|(id, _)| Field { parent: self.into(), id })
+            .collect()
+    }
+
+    pub fn kind(self, db: &dyn HirDatabase) -> StructKind {
+        self.variant_data(db).kind()
+    }
+
+    pub(crate) fn variant_data(self, db: &dyn HirDatabase) -> Arc<VariantData> {
+        db.enum_data(self.parent.id).variants[self.id].variant_data.clone()
+    }
+}
+
+/// A Data Type
+#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
+pub enum Adt {
+    Struct(Struct),
+    Union(Union),
+    Enum(Enum),
+}
+impl_from!(Struct, Union, Enum for Adt);
+
+impl Adt {
+    pub fn has_non_default_type_params(self, db: &dyn HirDatabase) -> bool {
+        let subst = db.generic_defaults(self.into());
+        subst.iter().any(|ty| &ty.value == &Ty::Unknown)
+    }
+
+    /// Turns this ADT into a type. Any type parameters of the ADT will be
+    /// turned into unknown types, which is good for e.g. finding the most
+    /// general set of completions, but will not look very nice when printed.
+    pub fn ty(self, db: &dyn HirDatabase) -> Type {
+        let id = AdtId::from(self);
+        Type::from_def(db, id.module(db.upcast()).krate(), id)
+    }
+
+    pub fn module(self, db: &dyn HirDatabase) -> Module {
+        match self {
+            Adt::Struct(s) => s.module(db),
+            Adt::Union(s) => s.module(db),
+            Adt::Enum(e) => e.module(db),
+        }
+    }
+
+    pub fn krate(self, db: &dyn HirDatabase) -> Option<Crate> {
+        Some(self.module(db).krate())
+    }
+
+    pub fn name(self, db: &dyn HirDatabase) -> Name {
+        match self {
+            Adt::Struct(s) => s.name(db),
+            Adt::Union(u) => u.name(db),
+            Adt::Enum(e) => e.name(db),
+        }
+    }
+}
+
+#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
+pub enum VariantDef {
+    Struct(Struct),
+    Union(Union),
+    Variant(Variant),
+}
+impl_from!(Struct, Union, Variant for VariantDef);
+
+impl VariantDef {
+    pub fn fields(self, db: &dyn HirDatabase) -> Vec<Field> {
+        match self {
+            VariantDef::Struct(it) => it.fields(db),
+            VariantDef::Union(it) => it.fields(db),
+            VariantDef::Variant(it) => it.fields(db),
+        }
+    }
+
+    pub fn module(self, db: &dyn HirDatabase) -> Module {
+        match self {
+            VariantDef::Struct(it) => it.module(db),
+            VariantDef::Union(it) => it.module(db),
+            VariantDef::Variant(it) => it.module(db),
+        }
+    }
+
+    pub fn name(&self, db: &dyn HirDatabase) -> Name {
+        match self {
+            VariantDef::Struct(s) => s.name(db),
+            VariantDef::Union(u) => u.name(db),
+            VariantDef::Variant(e) => e.name(db),
+        }
+    }
+
+    pub(crate) fn variant_data(self, db: &dyn HirDatabase) -> Arc<VariantData> {
+        match self {
+            VariantDef::Struct(it) => it.variant_data(db),
+            VariantDef::Union(it) => it.variant_data(db),
+            VariantDef::Variant(it) => it.variant_data(db),
+        }
+    }
+}
+
+/// The defs which have a body.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+pub enum DefWithBody {
+    Function(Function),
+    Static(Static),
+    Const(Const),
+}
+impl_from!(Function, Const, Static for DefWithBody);
+
+impl DefWithBody {
+    pub fn module(self, db: &dyn HirDatabase) -> Module {
+        match self {
+            DefWithBody::Const(c) => c.module(db),
+            DefWithBody::Function(f) => f.module(db),
+            DefWithBody::Static(s) => s.module(db),
+        }
+    }
+
+    pub fn name(self, db: &dyn HirDatabase) -> Option<Name> {
+        match self {
+            DefWithBody::Function(f) => Some(f.name(db)),
+            DefWithBody::Static(s) => s.name(db),
+            DefWithBody::Const(c) => c.name(db),
+        }
+    }
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+pub struct Function {
+    pub(crate) id: FunctionId,
+}
+
+impl Function {
+    pub fn module(self, db: &dyn HirDatabase) -> Module {
+        self.id.lookup(db.upcast()).module(db.upcast()).into()
+    }
+
+    pub fn krate(self, db: &dyn HirDatabase) -> Option<Crate> {
+        Some(self.module(db).krate())
+    }
+
+    pub fn name(self, db: &dyn HirDatabase) -> Name {
+        db.function_data(self.id).name.clone()
+    }
+
+    /// Get this function's return type
+    pub fn ret_type(self, db: &dyn HirDatabase) -> Type {
+        let resolver = self.id.resolver(db.upcast());
+        let krate = self.id.lookup(db.upcast()).container.module(db.upcast()).krate();
+        let ret_type = &db.function_data(self.id).ret_type;
+        let ctx = hir_ty::TyLoweringContext::new(db, &resolver);
+        let ty = Ty::from_hir_ext(&ctx, ret_type).0;
+        Type::new_with_resolver_inner(db, krate, &resolver, ty)
+    }
+
+    pub fn self_param(self, db: &dyn HirDatabase) -> Option<SelfParam> {
+        if !db.function_data(self.id).has_self_param {
+            return None;
+        }
+        Some(SelfParam { func: self.id })
+    }
+
+    pub fn assoc_fn_params(self, db: &dyn HirDatabase) -> Vec<Param> {
+        let resolver = self.id.resolver(db.upcast());
+        let krate = self.id.lookup(db.upcast()).container.module(db.upcast()).krate();
+        let ctx = hir_ty::TyLoweringContext::new(db, &resolver);
+        let environment = TraitEnvironment::lower(db, &resolver);
+        db.function_data(self.id)
+            .params
+            .iter()
+            .map(|type_ref| {
+                let ty = Type {
+                    krate,
+                    ty: InEnvironment {
+                        value: Ty::from_hir_ext(&ctx, type_ref).0,
+                        environment: environment.clone(),
+                    },
+                };
+                Param { ty }
+            })
+            .collect()
+    }
+    pub fn method_params(self, db: &dyn HirDatabase) -> Option<Vec<Param>> {
+        if self.self_param(db).is_none() {
+            return None;
+        }
+        let mut res = self.assoc_fn_params(db);
+        res.remove(0);
+        Some(res)
+    }
+
+    pub fn is_unsafe(self, db: &dyn HirDatabase) -> bool {
+        db.function_data(self.id).is_unsafe
+    }
+
+    pub fn diagnostics(self, db: &dyn HirDatabase, sink: &mut DiagnosticSink) {
+        let krate = self.module(db).id.krate();
+        hir_def::diagnostics::validate_body(db.upcast(), self.id.into(), sink);
+        hir_ty::diagnostics::validate_module_item(db, krate, self.id.into(), sink);
+        hir_ty::diagnostics::validate_body(db, self.id.into(), sink);
+    }
+
+    /// Whether this function declaration has a definition.
+    ///
+    /// This is false in the case of required (not provided) trait methods.
+    pub fn has_body(self, db: &dyn HirDatabase) -> bool {
+        db.function_data(self.id).has_body
+    }
+
+    /// A textual representation of the HIR of this function for debugging purposes.
+    pub fn debug_hir(self, db: &dyn HirDatabase) -> String {
+        let body = db.body(self.id.into());
+
+        let mut result = String::new();
+        format_to!(result, "HIR expressions in the body of `{}`:\n", self.name(db));
+        for (id, expr) in body.exprs.iter() {
+            format_to!(result, "{:?}: {:?}\n", id, expr);
+        }
+
+        result
+    }
+}
+
+// Note: logically, this belongs to `hir_ty`, but we are not using it there yet.
+pub enum Access {
+    Shared,
+    Exclusive,
+    Owned,
+}
+
+impl From<hir_ty::Mutability> for Access {
+    fn from(mutability: hir_ty::Mutability) -> Access {
+        match mutability {
+            hir_ty::Mutability::Not => Access::Shared,
+            hir_ty::Mutability::Mut => Access::Exclusive,
+        }
+    }
+}
+
+#[derive(Debug)]
+pub struct Param {
+    ty: Type,
+}
+
+impl Param {
+    pub fn ty(&self) -> &Type {
+        &self.ty
+    }
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+pub struct SelfParam {
+    func: FunctionId,
+}
+
+impl SelfParam {
+    pub fn access(self, db: &dyn HirDatabase) -> Access {
+        let func_data = db.function_data(self.func);
+        func_data
+            .params
+            .first()
+            .map(|param| match *param {
+                TypeRef::Reference(.., mutability) => match mutability {
+                    hir_def::type_ref::Mutability::Shared => Access::Shared,
+                    hir_def::type_ref::Mutability::Mut => Access::Exclusive,
+                },
+                _ => Access::Owned,
+            })
+            .unwrap_or(Access::Owned)
+    }
+}
+
+impl HasVisibility for Function {
+    fn visibility(&self, db: &dyn HirDatabase) -> Visibility {
+        let function_data = db.function_data(self.id);
+        let visibility = &function_data.visibility;
+        visibility.resolve(db.upcast(), &self.id.resolver(db.upcast()))
+    }
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+pub struct Const {
+    pub(crate) id: ConstId,
+}
+
+impl Const {
+    pub fn module(self, db: &dyn HirDatabase) -> Module {
+        Module { id: self.id.lookup(db.upcast()).module(db.upcast()) }
+    }
+
+    pub fn krate(self, db: &dyn HirDatabase) -> Option<Crate> {
+        Some(self.module(db).krate())
+    }
+
+    pub fn name(self, db: &dyn HirDatabase) -> Option<Name> {
+        db.const_data(self.id).name.clone()
+    }
+}
+
+impl HasVisibility for Const {
+    fn visibility(&self, db: &dyn HirDatabase) -> Visibility {
+        let function_data = db.const_data(self.id);
+        let visibility = &function_data.visibility;
+        visibility.resolve(db.upcast(), &self.id.resolver(db.upcast()))
+    }
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+pub struct Static {
+    pub(crate) id: StaticId,
+}
+
+impl Static {
+    pub fn module(self, db: &dyn HirDatabase) -> Module {
+        Module { id: self.id.lookup(db.upcast()).module(db.upcast()) }
+    }
+
+    pub fn krate(self, db: &dyn HirDatabase) -> Option<Crate> {
+        Some(self.module(db).krate())
+    }
+
+    pub fn name(self, db: &dyn HirDatabase) -> Option<Name> {
+        db.static_data(self.id).name.clone()
+    }
+
+    pub fn is_mut(self, db: &dyn HirDatabase) -> bool {
+        db.static_data(self.id).mutable
+    }
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+pub struct Trait {
+    pub(crate) id: TraitId,
+}
+
+impl Trait {
+    pub fn module(self, db: &dyn HirDatabase) -> Module {
+        Module { id: self.id.lookup(db.upcast()).container }
+    }
+
+    pub fn name(self, db: &dyn HirDatabase) -> Name {
+        db.trait_data(self.id).name.clone()
+    }
+
+    pub fn items(self, db: &dyn HirDatabase) -> Vec<AssocItem> {
+        db.trait_data(self.id).items.iter().map(|(_name, it)| (*it).into()).collect()
+    }
+
+    pub fn is_auto(self, db: &dyn HirDatabase) -> bool {
+        db.trait_data(self.id).auto
+    }
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+pub struct TypeAlias {
+    pub(crate) id: TypeAliasId,
+}
+
+impl TypeAlias {
+    pub fn has_non_default_type_params(self, db: &dyn HirDatabase) -> bool {
+        let subst = db.generic_defaults(self.id.into());
+        subst.iter().any(|ty| &ty.value == &Ty::Unknown)
+    }
+
+    pub fn module(self, db: &dyn HirDatabase) -> Module {
+        Module { id: self.id.lookup(db.upcast()).module(db.upcast()) }
+    }
+
+    pub fn krate(self, db: &dyn HirDatabase) -> Option<Crate> {
+        Some(self.module(db).krate())
+    }
+
+    pub fn type_ref(self, db: &dyn HirDatabase) -> Option<TypeRef> {
+        db.type_alias_data(self.id).type_ref.clone()
+    }
+
+    pub fn ty(self, db: &dyn HirDatabase) -> Type {
+        Type::from_def(db, self.id.lookup(db.upcast()).module(db.upcast()).krate(), self.id)
+    }
+
+    pub fn name(self, db: &dyn HirDatabase) -> Name {
+        db.type_alias_data(self.id).name.clone()
+    }
+}
+
+impl HasVisibility for TypeAlias {
+    fn visibility(&self, db: &dyn HirDatabase) -> Visibility {
+        let function_data = db.type_alias_data(self.id);
+        let visibility = &function_data.visibility;
+        visibility.resolve(db.upcast(), &self.id.resolver(db.upcast()))
+    }
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+pub struct BuiltinType {
+    pub(crate) inner: hir_def::builtin_type::BuiltinType,
+}
+
+impl BuiltinType {
+    pub fn ty(self, db: &dyn HirDatabase, module: Module) -> Type {
+        let resolver = module.id.resolver(db.upcast());
+        Type::new_with_resolver(db, &resolver, Ty::builtin(self.inner))
+            .expect("crate not present in resolver")
+    }
+
+    pub fn name(self) -> Name {
+        self.inner.as_name()
+    }
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+pub struct MacroDef {
+    pub(crate) id: MacroDefId,
+}
+
+impl MacroDef {
+    /// FIXME: right now, this just returns the root module of the crate that
+    /// defines this macro. The reasons for this is that macros are expanded
+    /// early, in `hir_expand`, where modules simply do not exist yet.
+    pub fn module(self, db: &dyn HirDatabase) -> Option<Module> {
+        let krate = self.id.krate;
+        let def_map = db.crate_def_map(krate);
+        let module_id = def_map.root();
+        Some(Module { id: def_map.module_id(module_id) })
+    }
+
+    /// XXX: this parses the file
+    pub fn name(self, db: &dyn HirDatabase) -> Option<Name> {
+        self.source(db)?.value.name().map(|it| it.as_name())
+    }
+
+    /// Indicate it is a proc-macro
+    pub fn is_proc_macro(&self) -> bool {
+        matches!(self.id.kind, MacroDefKind::ProcMacro(_))
+    }
+
+    /// Indicate it is a derive macro
+    pub fn is_derive_macro(&self) -> bool {
+        matches!(s