44 files changed, 1061 insertions, 322 deletions

diff --git a/crates/ra_assists/src/doc_tests/generated.rs b/crates/ra_assists/src/doc_tests/generated.rs
index b63b4d81a..b39e60870 100644
--- a/crates/ra_assists/src/doc_tests/generated.rs
+++ b/crates/ra_assists/src/doc_tests/generated.rs
@@ -78,7 +78,7 @@ fn foo() {
 }
 
 fn bar(arg: &str, baz: Baz) {
-    unimplemented!()
+    todo!()
 }
 
 "#####,
diff --git a/crates/ra_assists/src/handlers/add_function.rs b/crates/ra_assists/src/handlers/add_function.rs
index 488bae08f..ad4ab66ed 100644
--- a/crates/ra_assists/src/handlers/add_function.rs
+++ b/crates/ra_assists/src/handlers/add_function.rs
@@ -29,7 +29,7 @@ use rustc_hash::{FxHashMap, FxHashSet};
 // }
 //
 // fn bar(arg: &str, baz: Baz) {
-//     unimplemented!()
+//     todo!()
 // }
 //
 // ```
@@ -80,7 +80,7 @@ impl FunctionBuilder {
         Some(Self { append_fn_at, fn_name, type_params, params })
     }
     fn render(self) -> Option<FunctionTemplate> {
-        let placeholder_expr = ast::make::expr_unimplemented();
+        let placeholder_expr = ast::make::expr_todo();
         let fn_body = ast::make::block_expr(vec![], Some(placeholder_expr));
         let fn_def = ast::make::fn_def(self.fn_name, self.type_params, self.params, fn_body);
         let fn_def = ast::make::add_newlines(2, fn_def);
@@ -225,7 +225,7 @@ fn foo() {
 }
 
 fn bar() {
-    <|>unimplemented!()
+    <|>todo!()
 }
 ",
         )
@@ -252,7 +252,7 @@ impl Foo {
 }
 
 fn bar() {
-    <|>unimplemented!()
+    <|>todo!()
 }
 ",
         )
@@ -276,7 +276,7 @@ fn foo1() {
 }
 
 fn bar() {
-    <|>unimplemented!()
+    <|>todo!()
 }
 
 fn foo2() {}
@@ -302,7 +302,7 @@ mod baz {
     }
 
     fn bar() {
-        <|>unimplemented!()
+        <|>todo!()
     }
 }
 ",
@@ -315,20 +315,20 @@ mod baz {
             add_function,
             r"
 struct Baz;
-fn baz() -> Baz { unimplemented!() }
+fn baz() -> Baz { todo!() }
 fn foo() {
     bar<|>(baz());
 }
 ",
             r"
 struct Baz;
-fn baz() -> Baz { unimplemented!() }
+fn baz() -> Baz { todo!() }
 fn foo() {
     bar(baz());
 }
 
 fn bar(baz: Baz) {
-    <|>unimplemented!()
+    <|>todo!()
 }
 ",
         );
@@ -361,7 +361,7 @@ impl Baz {
 }
 
 fn bar(baz: Baz) {
-    <|>unimplemented!()
+    <|>todo!()
 }
 ",
         )
@@ -382,7 +382,7 @@ fn foo() {
 }
 
 fn bar(arg: &str) {
-    <|>unimplemented!()
+    <|>todo!()
 }
 "#,
         )
@@ -403,7 +403,7 @@ fn foo() {
 }
 
 fn bar(arg: char) {
-    <|>unimplemented!()
+    <|>todo!()
 }
 "#,
         )
@@ -424,7 +424,7 @@ fn foo() {
 }
 
 fn bar(arg: i32) {
-    <|>unimplemented!()
+    <|>todo!()
 }
 ",
         )
@@ -445,7 +445,7 @@ fn foo() {
 }
 
 fn bar(arg: u8) {
-    <|>unimplemented!()
+    <|>todo!()
 }
 ",
         )
@@ -470,7 +470,7 @@ fn foo() {
 }
 
 fn bar(x: u8) {
-    <|>unimplemented!()
+    <|>todo!()
 }
 ",
         )
@@ -493,7 +493,7 @@ fn foo() {
 }
 
 fn bar(worble: ()) {
-    <|>unimplemented!()
+    <|>todo!()
 }
 ",
         )
@@ -506,7 +506,7 @@ fn bar(worble: ()) {
             r"
 trait Foo {}
 fn foo() -> impl Foo {
-    unimplemented!()
+    todo!()
 }
 fn baz() {
     <|>bar(foo())
@@ -515,14 +515,14 @@ fn baz() {
             r"
 trait Foo {}
 fn foo() -> impl Foo {
-    unimplemented!()
+    todo!()
 }
 fn baz() {
     bar(foo())
 }
 
 fn bar(foo: impl Foo) {
-    <|>unimplemented!()
+    <|>todo!()
 }
 ",
         )
@@ -556,7 +556,7 @@ mod Foo {
     }
 
     fn bar(baz: super::Baz::Bof) {
-        <|>unimplemented!()
+        <|>todo!()
     }
 }
 ",
@@ -580,7 +580,7 @@ fn foo<T>(t: T) {
 }
 
 fn bar<T>(t: T) {
-    <|>unimplemented!()
+    <|>todo!()
 }
 ",
         )
@@ -611,7 +611,7 @@ fn foo() {
 }
 
 fn bar(arg: fn() -> Baz) {
-    <|>unimplemented!()
+    <|>todo!()
 }
 ",
         )
@@ -636,7 +636,7 @@ fn foo() {
 }
 
 fn bar(closure: impl Fn(i64) -> i64) {
-    <|>unimplemented!()
+    <|>todo!()
 }
 ",
         )
@@ -657,7 +657,7 @@ fn foo() {
 }
 
 fn bar(baz: ()) {
-    <|>unimplemented!()
+    <|>todo!()
 }
 ",
         )
@@ -682,7 +682,7 @@ fn foo() {
 }
 
 fn bar(baz_1: Baz, baz_2: Baz) {
-    <|>unimplemented!()
+    <|>todo!()
 }
 ",
         )
@@ -707,7 +707,7 @@ fn foo() {
 }
 
 fn bar(baz_1: Baz, baz_2: Baz, arg_1: &str, arg_2: &str) {
-    <|>unimplemented!()
+    <|>todo!()
 }
 "#,
         )
@@ -779,7 +779,7 @@ impl Foo {
         self.bar();
     }
     fn bar(&self) {
-        unimplemented!();
+        todo!();
     }
 }
         ",
diff --git a/crates/ra_flycheck/Cargo.toml b/crates/ra_flycheck/Cargo.toml
index c9a9ddc12..76e5cada4 100644
--- a/crates/ra_flycheck/Cargo.toml
+++ b/crates/ra_flycheck/Cargo.toml
@@ -13,4 +13,4 @@ serde_json = "1.0.48"
 jod-thread = "0.1.1"
 
 [dev-dependencies]
-insta = "0.15.0"
+insta = "0.16.0"
diff --git a/crates/ra_hir/src/code_model.rs b/crates/ra_hir/src/code_model.rs
index 9baebf643..3801fce23 100644
--- a/crates/ra_hir/src/code_model.rs
+++ b/crates/ra_hir/src/code_model.rs
@@ -25,7 +25,7 @@ use hir_ty::{
     autoderef, display::HirFormatter, expr::ExprValidator, method_resolution, ApplicationTy,
     Canonical, InEnvironment, Substs, TraitEnvironment, Ty, TyDefId, TypeCtor,
 };
-use ra_db::{CrateId, Edition, FileId};
+use ra_db::{CrateId, CrateName, Edition, FileId};
 use ra_prof::profile;
 use ra_syntax::{
     ast::{self, AttrsOwner, NameOwner},
@@ -91,6 +91,10 @@ impl Crate {
         db.crate_graph()[self.id].edition
     }
 
+    pub fn display_name(self, db: &dyn HirDatabase) -> Option<CrateName> {
+        db.crate_graph()[self.id].display_name.as_ref().cloned()
+    }
+
     pub fn all(db: &dyn HirDatabase) -> Vec<Crate> {
         db.crate_graph().iter().map(|id| Crate { id }).collect()
     }
diff --git a/crates/ra_hir_def/Cargo.toml b/crates/ra_hir_def/Cargo.toml
index 56e791e3e..b85358308 100644
--- a/crates/ra_hir_def/Cargo.toml
+++ b/crates/ra_hir_def/Cargo.toml
@@ -28,4 +28,4 @@ ra_cfg = { path = "../ra_cfg" }
 tt = { path = "../ra_tt", package = "ra_tt" }
 
 [dev-dependencies]
-insta = "0.15.0"
+insta = "0.16.0"
diff --git a/crates/ra_hir_def/src/data.rs b/crates/ra_hir_def/src/data.rs
index 56a20c5bd..ccb682f9a 100644
--- a/crates/ra_hir_def/src/data.rs
+++ b/crates/ra_hir_def/src/data.rs
@@ -9,13 +9,14 @@ use hir_expand::{
 };
 use ra_prof::profile;
 use ra_syntax::ast::{
-    self, AstNode, ImplItem, ModuleItemOwner, NameOwner, TypeAscriptionOwner, VisibilityOwner,
+    self, AstNode, ImplItem, ModuleItemOwner, NameOwner, TypeAscriptionOwner, TypeBoundsOwner,
+    VisibilityOwner,
 };
 
 use crate::{
     attr::Attrs,
     db::DefDatabase,
-    path::{path, GenericArgs, Path},
+    path::{path, AssociatedTypeBinding, GenericArgs, Path},
     src::HasSource,
     type_ref::{Mutability, TypeBound, TypeRef},
     visibility::RawVisibility,
@@ -95,7 +96,11 @@ fn desugar_future_path(orig: TypeRef) -> Path {
     let path = path![std::future::Future];
     let mut generic_args: Vec<_> = std::iter::repeat(None).take(path.segments.len() - 1).collect();
     let mut last = GenericArgs::empty();
-    last.bindings.push((name![Output], orig));
+    last.bindings.push(AssociatedTypeBinding {
+        name: name![Output],
+        type_ref: Some(orig),
+        bounds: Vec::new(),
+    });
     generic_args.push(Some(Arc::new(last)));
 
     Path::from_known_path(path, generic_args)
@@ -106,6 +111,7 @@ pub struct TypeAliasData {
     pub name: Name,
     pub type_ref: Option<TypeRef>,
     pub visibility: RawVisibility,
+    pub bounds: Vec<TypeBound>,
 }
 
 impl TypeAliasData {
@@ -118,9 +124,17 @@ impl TypeAliasData {
         let name = node.value.name().map_or_else(Name::missing, |n| n.as_name());
         let type_ref = node.value.type_ref().map(TypeRef::from_ast);
         let vis_default = RawVisibility::default_for_container(loc.container);
-        let visibility =
-            RawVisibility::from_ast_with_default(db, vis_default, node.map(|n| n.visibility()));
-        Arc::new(TypeAliasData { name, type_ref, visibility })
+        let visibility = RawVisibility::from_ast_with_default(
+            db,
+            vis_default,
+            node.as_ref().map(|n| n.visibility()),
+        );
+        let bounds = if let Some(bound_list) = node.value.type_bound_list() {
+            bound_list.bounds().map(TypeBound::from_ast).collect()
+        } else {
+            Vec::new()
+        };
+        Arc::new(TypeAliasData { name, type_ref, visibility, bounds })
     }
 }
 
diff --git a/crates/ra_hir_def/src/path.rs b/crates/ra_hir_def/src/path.rs
index 91c7b3e09..162b3c8c7 100644
--- a/crates/ra_hir_def/src/path.rs
+++ b/crates/ra_hir_def/src/path.rs
@@ -14,7 +14,10 @@ use hir_expand::{
 use ra_db::CrateId;
 use ra_syntax::ast;
 
-use crate::{type_ref::TypeRef, InFile};
+use crate::{
+    type_ref::{TypeBound, TypeRef},
+    InFile,
+};
 
 #[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
 pub struct ModPath {
@@ -111,7 +114,21 @@ pub struct GenericArgs {
     /// is left out.
     pub has_self_type: bool,
     /// Associated type bindings like in `Iterator<Item = T>`.
-    pub bindings: Vec<(Name, TypeRef)>,
+    pub bindings: Vec<AssociatedTypeBinding>,
+}
+
+/// An associated type binding like in `Iterator<Item = T>`.
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct AssociatedTypeBinding {
+    /// The name of the associated type.
+    pub name: Name,
+    /// The type bound to this associated type (in `Item = T`, this would be the
+    /// `T`). This can be `None` if there are bounds instead.
+    pub type_ref: Option<TypeRef>,
+    /// Bounds for the associated type, like in `Iterator<Item:
+    /// SomeOtherTrait>`. (This is the unstable `associated_type_bounds`
+    /// feature.)
+    pub bounds: Vec<TypeBound>,
 }
 
 /// A single generic argument.
diff --git a/crates/ra_hir_def/src/path/lower.rs b/crates/ra_hir_def/src/path/lower.rs
index 0f806d6fb..9ec2e0dcd 100644
--- a/crates/ra_hir_def/src/path/lower.rs
+++ b/crates/ra_hir_def/src/path/lower.rs
@@ -9,11 +9,12 @@ use hir_expand::{
     hygiene::Hygiene,
     name::{name, AsName},
 };
-use ra_syntax::ast::{self, AstNode, TypeAscriptionOwner};
+use ra_syntax::ast::{self, AstNode, TypeAscriptionOwner, TypeBoundsOwner};
 
+use super::AssociatedTypeBinding;
 use crate::{
     path::{GenericArg, GenericArgs, ModPath, Path, PathKind},
-    type_ref::TypeRef,
+    type_ref::{TypeBound, TypeRef},
 };
 
 pub(super) use lower_use::lower_use_tree;
@@ -136,10 +137,16 @@ pub(super) fn lower_generic_args(node: ast::TypeArgList) -> Option<GenericArgs>
     // lifetimes ignored for now
     let mut bindings = Vec::new();
     for assoc_type_arg in node.assoc_type_args() {
+        let assoc_type_arg: ast::AssocTypeArg = assoc_type_arg;
         if let Some(name_ref) = assoc_type_arg.name_ref() {
             let name = name_ref.as_name();
-            let type_ref = TypeRef::from_ast_opt(assoc_type_arg.type_ref());
-            bindings.push((name, type_ref));
+            let type_ref = assoc_type_arg.type_ref().map(TypeRef::from_ast);
+            let bounds = if let Some(l) = assoc_type_arg.type_bound_list() {
+                l.bounds().map(TypeBound::from_ast).collect()
+            } else {
+                Vec::new()
+            };
+            bindings.push(AssociatedTypeBinding { name, type_ref, bounds });
         }
     }
     if args.is_empty() && bindings.is_empty() {
@@ -168,7 +175,11 @@ fn lower_generic_args_from_fn_path(
     }
     if let Some(ret_type) = ret_type {
         let type_ref = TypeRef::from_ast_opt(ret_type.type_ref());
-        bindings.push((name![Output], type_ref))
+        bindings.push(AssociatedTypeBinding {
+            name: name![Output],
+            type_ref: Some(type_ref),
+            bounds: Vec::new(),
+        });
     }
     if args.is_empty() && bindings.is_empty() {
         None
diff --git a/crates/ra_hir_def/src/type_ref.rs b/crates/ra_hir_def/src/type_ref.rs
index ea29c4176..f308c6bdf 100644
--- a/crates/ra_hir_def/src/type_ref.rs
+++ b/crates/ra_hir_def/src/type_ref.rs
@@ -163,8 +163,16 @@ impl TypeRef {
                         let crate::path::GenericArg::Type(type_ref) = arg;
                         go(type_ref, f);
                     }
-                    for (_, type_ref) in &args_and_bindings.bindings {
-                        go(type_ref, f);
+                    for binding in &args_and_bindings.bindings {
+                        if let Some(type_ref) = &binding.type_ref {
+                            go(type_ref, f);
+                        }
+                        for bound in &binding.bounds {
+                            match bound {
+                                TypeBound::Path(path) => go_path(path, f),
+                                TypeBound::Error => (),
+                            }
+                        }
                     }
                 }
             }
diff --git a/crates/ra_hir_ty/Cargo.toml b/crates/ra_hir_ty/Cargo.toml
index 59efc1c31..177bdbcb0 100644
--- a/crates/ra_hir_ty/Cargo.toml
+++ b/crates/ra_hir_ty/Cargo.toml
@@ -8,6 +8,7 @@ authors = ["rust-analyzer developers"]
 doctest = false
 
 [dependencies]
+itertools = "0.9.0"
 arrayvec = "0.5.1"
 smallvec = "1.2.0"
 ena = "0.13.1"
@@ -26,9 +27,9 @@ test_utils = { path = "../test_utils" }
 
 scoped-tls = "1"
 
-chalk-solve =   { git = "https://github.com/rust-lang/chalk.git", rev = "039fc904a05f8cb3d0c682c9a57a63dda7a35356" }
-chalk-rust-ir = { git = "https://github.com/rust-lang/chalk.git", rev = "039fc904a05f8cb3d0c682c9a57a63dda7a35356" }
-chalk-ir =      { git = "https://github.com/rust-lang/chalk.git", rev = "039fc904a05f8cb3d0c682c9a57a63dda7a35356" }
+chalk-solve =   { git = "https://github.com/rust-lang/chalk.git", rev = "28cef6ff403d403e6ad2f3d27d944e9ffac1bce8" }
+chalk-rust-ir = { git = "https://github.com/rust-lang/chalk.git", rev = "28cef6ff403d403e6ad2f3d27d944e9ffac1bce8" }
+chalk-ir =      { git = "https://github.com/rust-lang/chalk.git", rev = "28cef6ff403d403e6ad2f3d27d944e9ffac1bce8" }
 
 [dev-dependencies]
-insta = "0.15.0"
+insta = "0.16.0"
diff --git a/crates/ra_hir_ty/src/_match.rs b/crates/ra_hir_ty/src/_match.rs
index a64be9848..688026a04 100644
--- a/crates/ra_hir_ty/src/_match.rs
+++ b/crates/ra_hir_ty/src/_match.rs
@@ -194,9 +194,10 @@ use smallvec::{smallvec, SmallVec};
 use crate::{
     db::HirDatabase,
     expr::{Body, Expr, Literal, Pat, PatId},
-    InferenceResult,
+    ApplicationTy, InferenceResult, Ty, TypeCtor,
 };
-use hir_def::{adt::VariantData, EnumVariantId, VariantId};
+use hir_def::{adt::VariantData, AdtId, EnumVariantId, VariantId};
+use ra_arena::Idx;
 
 #[derive(Debug, Clone, Copy)]
 /// Either a pattern from the source code being analyzed, represented as
@@ -512,6 +513,7 @@ pub enum Usefulness {
 }
 
 pub struct MatchCheckCtx<'a> {
+    pub match_expr: Idx<Expr>,
     pub body: Arc<Body>,
     pub infer: Arc<InferenceResult>,
     pub db: &'a dyn HirDatabase,
@@ -530,6 +532,16 @@ pub(crate) fn is_useful(
     matrix: &Matrix,
     v: &PatStack,
 ) -> MatchCheckResult<Usefulness> {
+    // Handle the special case of enums with no variants. In that case, no match
+    // arm is useful.
+    if let Ty::Apply(ApplicationTy { ctor: TypeCtor::Adt(AdtId::EnumId(enum_id)), .. }) =
+        cx.infer[cx.match_expr].strip_references()
+    {
+        if cx.db.enum_data(*enum_id).variants.is_empty() {
+            return Ok(Usefulness::NotUseful);
+        }
+    }
+
     if v.is_empty() {
         let result = if matrix.is_empty() { Usefulness::Useful } else { Usefulness::NotUseful };
 
@@ -1618,6 +1630,32 @@ mod tests {
 
         check_no_diagnostic(content);
     }
+
+    #[test]
+    fn enum_never() {
+        let content = r"
+            enum Never {}
+
+            fn test_fn(never: Never) {
+                match never {}
+            }
+        ";
+
+        check_no_diagnostic(content);
+    }
+
+    #[test]
+    fn enum_never_ref() {
+        let content = r"
+            enum Never {}
+
+            fn test_fn(never: &Never) {
+                match never {}
+            }
+        ";
+
+        check_no_diagnostic(content);
+    }
 }
 
 #[cfg(test)]
diff --git a/crates/ra_hir_ty/src/autoderef.rs b/crates/ra_hir_ty/src/autoderef.rs
index d91c21e24..1b0f84c5c 100644
--- a/crates/ra_hir_ty/src/autoderef.rs
+++ b/crates/ra_hir_ty/src/autoderef.rs
@@ -14,7 +14,7 @@ use crate::{
     db::HirDatabase,
     traits::{InEnvironment, Solution},
     utils::generics,
-    BoundVar, Canonical, DebruijnIndex, Substs, Ty,
+    BoundVar, Canonical, DebruijnIndex, Obligation, Substs, TraitRef, Ty,
 };
 
 const AUTODEREF_RECURSION_LIMIT: usize = 10;
@@ -66,6 +66,20 @@ fn deref_by_trait(
     let parameters =
         Substs::build_for_generics(&generic_params).push(ty.value.value.clone()).build();
 
+    // Check that the type implements Deref at all
+    let trait_ref = TraitRef { trait_: deref_trait, substs: parameters.clone() };
+    let implements_goal = super::Canonical {
+        num_vars: ty.value.num_vars,
+        value: InEnvironment {
+            value: Obligation::Trait(trait_ref),
+            environment: ty.environment.clone(),
+        },
+    };
+    if db.trait_solve(krate, implements_goal).is_none() {
+        return None;
+    }
+
+    // Now do the assoc type projection
     let projection = super::traits::ProjectionPredicate {
         ty: Ty::Bound(BoundVar::new(DebruijnIndex::INNERMOST, ty.value.num_vars)),
         projection_ty: super::ProjectionTy { associated_ty: target, parameters },
@@ -91,6 +105,11 @@ fn deref_by_trait(
             // they're just being 'passed through'. In the 'standard' case where
             // we have `impl<T> Deref for Foo<T> { Target = T }`, that should be
             // the case.
+
+            // FIXME: if the trait solver decides to truncate the type, these
+            // assumptions will be broken. We would need to properly introduce
+            // new variables in that case
+
             for i in 1..vars.0.num_vars {
                 if vars.0.value[i - 1] != Ty::Bound(BoundVar::new(DebruijnIndex::INNERMOST, i - 1))
                 {
diff --git a/crates/ra_hir_ty/src/expr.rs b/crates/ra_hir_ty/src/expr.rs
index 21abbcf1e..fd59f4320 100644
--- a/crates/ra_hir_ty/src/expr.rs
+++ b/crates/ra_hir_ty/src/expr.rs
@@ -156,7 +156,7 @@ impl<'a, 'b> ExprValidator<'a, 'b> {
             None => return,
         };
 
-        let cx = MatchCheckCtx { body, infer: infer.clone(), db };
+        let cx = MatchCheckCtx { match_expr, body, infer: infer.clone(), db };
         let pats = arms.iter().map(|arm| arm.pat);
 
         let mut seen = Matrix::empty();
diff --git a/crates/ra_hir_ty/src/infer/unify.rs b/crates/ra_hir_ty/src/infer/unify.rs
index ac25f8a80..5f6cea8d3 100644
--- a/crates/ra_hir_ty/src/infer/unify.rs
+++ b/crates/ra_hir_ty/src/infer/unify.rs
@@ -32,6 +32,7 @@ where
     var_stack: Vec<TypeVarId>,
 }
 
+#[derive(Debug)]
 pub(super) struct Canonicalized<T> {
     pub value: Canonical<T>,
     free_vars: Vec<InferTy>,
diff --git a/crates/ra_hir_ty/src/lib.rs b/crates/ra_hir_ty/src/lib.rs
index 18f74d3b1..2677f3af2 100644
--- a/crates/ra_hir_ty/src/lib.rs
+++ b/crates/ra_hir_ty/src/lib.rs
@@ -680,6 +680,16 @@ impl Ty {
         }
     }
 
+    pub fn strip_references(&self) -> &Ty {
+        let mut t: &Ty = self;
+
+        while let Ty::Apply(ApplicationTy { ctor: TypeCtor::Ref(_mutability), parameters }) = t {
+            t = parameters.as_single();
+        }
+
+        t
+    }
+
     pub fn as_adt(&self) -> Option<(AdtId, &Substs)> {
         match self {
             Ty::Apply(ApplicationTy { ctor: TypeCtor::Adt(adt_def), parameters }) => {
diff --git a/crates/ra_hir_ty/src/lower.rs b/crates/ra_hir_ty/src/lower.rs
index 6c7bbc448..cc1ac8e3e 100644
--- a/crates/ra_hir_ty/src/lower.rs
+++ b/crates/ra_hir_ty/src/lower.rs
@@ -8,6 +8,8 @@
 use std::iter;
 use std::sync::Arc;
 
+use smallvec::SmallVec;
+
 use hir_def::{
     adt::StructKind,
     builtin_type::BuiltinType,
@@ -360,13 +362,23 @@ impl Ty {
             },
             Some(TypeNs::GenericParam(param_id)) => {
                 let predicates = ctx.db.generic_predicates_for_param(param_id);
-                predicates
+                let mut traits_: Vec<_> = predicates
                     .iter()
                     .filter_map(|pred| match &pred.value {
                         GenericPredicate::Implemented(tr) => Some(tr.trait_),
                         _ => None,
                     })
-                    .collect()
+                    .collect();
+                // Handle `Self::Type` referring to own associated type in trait definitions
+                if let GenericDefId::TraitId(trait_id) = param_id.parent {
+                    let generics = generics(ctx.db.upcast(), trait_id.into());
+                    if generics.params.types[param_id.local_id].provenance
+                        == TypeParamProvenance::TraitSelf
+                    {
+                        traits_.push(trait_id);
+                    }
+                }
+                traits_
             }
             _ => return Ty::Unknown,
         };
@@ -596,21 +608,35 @@ fn assoc_type_bindings_from_type_bound<'a>(
         .into_iter()
         .flat_map(|segment| segment.args_and_bindings.into_iter())
         .flat_map(|args_and_bindings| args_and_bindings.bindings.iter())
-        .map(move |(name, type_ref)| {
+        .flat_map(move |binding| {
             let associated_ty = associated_type_by_name_including_super_traits(
                 ctx.db.upcast(),
                 trait_ref.trait_,
-                &name,
+                &binding.name,
             );
             let associated_ty = match associated_ty {
-                None => return GenericPredicate::Error,
+                None => return SmallVec::<[GenericPredicate; 1]>::new(),
                 Some(t) => t,
             };
             let projection_ty =
                 ProjectionTy { associated_ty, parameters: trait_ref.substs.clone() };
-            let ty = Ty::from_hir(ctx, type_ref);
-            let projection_predicate = ProjectionPredicate { projection_ty, ty };
-            GenericPredicate::Projection(projection_predicate)
+            let mut preds = SmallVec::with_capacity(
+                binding.type_ref.as_ref().map_or(0, |_| 1) + binding.bounds.len(),
+            );
+            if let Some(type_ref) = &binding.type_ref {
+                let ty = Ty::from_hir(ctx, type_ref);
+                let projection_predicate =
+                    ProjectionPredicate { projection_ty: projection_ty.clone(), ty };
+                preds.push(GenericPredicate::Projection(projection_predicate));
+            }
+            for bound in &binding.bounds {
+                preds.extend(GenericPredicate::from_type_bound(
+                    ctx,
+                    bound,
+                    Ty::Projection(projection_ty.clone()),
+                ));
+            }
+            preds
         })
 }
 
diff --git a/crates/ra_hir_ty/src/tests/regression.rs b/crates/ra_hir_ty/src/tests/regression.rs
index 3402e0cb5..d69115a2f 100644
--- a/crates/ra_hir_ty/src/tests/regression.rs
+++ b/crates/ra_hir_ty/src/tests/regression.rs
@@ -451,8 +451,7 @@ pub mod str {
 "#,
     );
 
-    // should be Option<char>, but currently not because of Chalk ambiguity problem
-    assert_eq!("(Option<{unknown}>, Option<{unknown}>)", super::type_at_pos(&db, pos));
+    assert_eq!("(Option<char>, Option<char>)", super::type_at_pos(&db, pos));
 }
 
 #[test]
diff --git a/crates/ra_hir_ty/src/tests/traits.rs b/crates/ra_hir_ty/src/tests/traits.rs
index 22ae6ca90..0a889f805 100644
--- a/crates/ra_hir_ty/src/tests/traits.rs
+++ b/crates/ra_hir_ty/src/tests/traits.rs
@@ -349,7 +349,6 @@ trait Trait: SuperTrait {
 
 #[test]
 fn infer_project_associated_type() {
-    // y, z, a don't yet work because of https://github.com/rust-lang/chalk/issues/234
     assert_snapshot!(
         infer(r#"
 trait Iterable {
@@ -368,12 +367,12 @@ fn test<T: Iterable>() {
     [108; 261) '{     ...ter; }': ()
     [118; 119) 'x': u32
     [145; 146) '1': u32
-    [156; 157) 'y': {unknown}
-    [183; 192) 'no_matter': {unknown}
-    [202; 203) 'z': {unknown}
-    [215; 224) 'no_matter': {unknown}
-    [234; 235) 'a': {unknown}
-    [249; 258) 'no_matter': {unknown}
+    [156; 157) 'y': Iterable::Item<T>
+    [183; 192) 'no_matter': Iterable::Item<T>
+    [202; 203) 'z': Iterable::Item<T>
+    [215; 224) 'no_matter': Iterable::Item<T>
+    [234; 235) 'a': Iterable::Item<T>
+    [249; 258) 'no_matter': Iterable::Item<T>
     "###
     );
 }
@@ -433,8 +432,8 @@ fn test<T: Iterable<Item=u32>>() {
 "#),
         @r###"
     [67; 100) '{     ...own; }': ()
-    [77; 78) 'y': {unknown}
-    [90; 97) 'unknown': {unknown}
+    [77; 78) 'y': u32
+    [90; 97) 'unknown': u32
     "###
     );
 }
@@ -549,7 +548,7 @@ impl std::ops::Index<u32> for Bar {
 
 fn test() {
     let a = Bar;
-    let b = a[1];
+    let b = a[1u32];
     b<|>;
 }
 
@@ -574,7 +573,7 @@ fn infer_ops_index_autoderef() {
 //- /main.rs crate:main deps:std
 fn test() {
     let a = &[1u32, 2, 3];
-    let b = a[1];
+    let b = a[1u32];
     b<|>;
 }
 
@@ -916,11 +915,7 @@ fn test<T: ApplyL>(t: T) {
 }
 "#,
     );
-    // FIXME here Chalk doesn't normalize the type to a placeholder. I think we
-    // need to add a rule like Normalize(<T as ApplyL>::Out -> ApplyL::Out<T>)
-    // to the trait env ourselves here; probably Chalk can't do this by itself.
-    // assert_eq!(t, "ApplyL::Out<[missing name]>");
-    assert_eq!(t, "{unknown}");
+    assert_eq!(t, "ApplyL::Out<T>");
 }
 
 #[test]
@@ -1329,16 +1324,16 @@ fn test<T: Trait<Type = u32>>(x: T, y: impl Trait<Type = i64>) {
     [263; 264) 'y': impl Trait<Type = i64>
     [290; 398) '{     ...r>); }': ()
     [296; 299) 'get': fn get<T>(T) -> <T as Trait>::Type
-    [296; 302) 'get(x)': {unknown}
+    [296; 302) 'get(x)': u32
     [300; 301) 'x': T
-    [308; 312) 'get2': fn get2<{unknown}, T>(T) -> {unknown}
-    [308; 315) 'get2(x)': {unknown}
+    [308; 312) 'get2': fn get2<u32, T>(T) -> u32
+    [308; 315) 'get2(x)': u32
     [313; 314) 'x': T
     [321; 324) 'get': fn get<impl Trait<Type = i64>>(impl Trait<Type = i64>) -> <impl Trait<Type = i64> as Trait>::Type
-    [321; 327) 'get(y)': {unknown}
+    [321; 327) 'get(y)': i64
     [325; 326) 'y': impl Trait<Type = i64>
-    [333; 337) 'get2': fn get2<{unknown}, impl Trait<Type = i64>>(impl Trait<Type = i64>) -> {unknown}
-    [333; 340) 'get2(y)': {unknown}
+    [333; 337) 'get2': fn get2<i64, impl Trait<Type = i64>>(impl Trait<Type = i64>) -> i64
+    [333; 340) 'get2(y)': i64
     [338; 339) 'y': impl Trait<Type = i64>
     [346; 349) 'get': fn get<S<u64>>(S<u64>) -> <S<u64> as Trait>::Type
     [346; 357) 'get(set(S))': u64
@@ -1402,7 +1397,6 @@ mod iter {
 
 #[test]
 fn projection_eq_within_chalk() {
-    // std::env::set_var("CHALK_DEBUG", "1");
     assert_snapshot!(
         infer(r#"
 trait Trait1 {
@@ -1422,7 +1416,7 @@ fn test<T: Trait1<Type = u32>>(x: T) {
     [164; 165) 'x': T
     [170; 186) '{     ...o(); }': ()
     [176; 177) 'x': T
-    [176; 183) 'x.foo()': {unknown}
+    [176; 183) 'x.foo()': u32
     "###
     );
 }
@@ -1578,7 +1572,7 @@ fn test<F: FnOnce(u32, u64) -> u128>(f: F) {
     [150; 151) 'f': F
     [156; 184) '{     ...2)); }': ()
     [162; 163) 'f': F
-    [162; 181) 'f.call...1, 2))': {unknown}
+    [162; 181) 'f.call...1, 2))': u128
     [174; 180) '(1, 2)': (u32, u64)
     [175; 176) '1': u32
     [178; 179) '2': u64
@@ -1803,7 +1797,7 @@ fn test<T, U>() where T::Item: Trait2, T: Trait<U::Item>, U: Trait<()> {
 }
 
 #[test]
-fn unselected_projection_on_trait_self() {
+fn unselected_projection_on_impl_self() {
     assert_snapshot!(infer(
         r#"
 //- /main.rs
@@ -1829,7 +1823,7 @@ impl Trait for S2 {
 "#,
     ), @r###"
     [54; 58) 'self': &Self
-    [60; 61) 'x': {unknown}
+    [60; 61) 'x': Trait::Item<Self>
     [140; 144) 'self': &S
     [146; 147) 'x': u32
     [161; 175) '{ let y = x; }': ()
@@ -1844,6 +1838,30 @@ impl Trait for S2 {
 }
 
 #[test]
+fn unselected_projection_on_trait_self() {
+    let t = type_at(
+        r#"
+//- /main.rs
+trait Trait {
+    type Item;
+
+    fn f(&self) -> Self::Item { loop {} }
+}
+
+struct S;
+impl Trait for S {
+    type Item = u32;
+}
+
+fn test() {
+    S.f()<|>;
+}
+"#,
+    );
+    assert_eq!(t, "u32");
+}
+
+#[test]
 fn trait_impl_self_ty() {
     let t = type_at(
         r#"
@@ -1924,6 +1942,119 @@ fn test<T, U>() where T: Trait<U::Item>, U: Trait<T::Item> {
 }
 
 #[test]
+fn inline_assoc_type_bounds_1() {
+    let t = type_at(
+        r#"
+//- /main.rs
+trait Iterator {
+    type Item;
+}
+trait OtherTrait<T> {
+    fn foo(&self) -> T;
+}
+
+// workaround for Chalk assoc type normalization problems
+pub struct S<T>;
+impl<T: Iterator> Iterator for S<T> {
+    type Item = <T as Iterator>::Item;
+}
+
+fn test<I: Iterator<Item: OtherTrait<u32>>>() {
+    let x: <S<I> as Iterator>::Item;
+    x.foo()<|>;
+}
+"#,
+    );
+    assert_eq!(t, "u32");
+}
+
+#[test]
+fn inline_assoc_type_bounds_2() {
+    let t = type_at(
+        r#"
+//- /main.rs
+trait Iterator {
+    type Item;
+}
+
+fn test<I: Iterator<Item: Iterator<Item = u32>>>() {
+    let x: <<I as Iterator>::Item as Iterator>::Item;
+    x<|>;
+}
+"#,
+    );
+    assert_eq!(t, "u32");
+}
+
+#[test]
+fn proc_macro_server_types() {
+    assert_snapshot!(
+        infer_with_mismatches(r#"
+macro_rules! with_api {
+    ($S:ident, $self:ident, $m:ident) => {
+        $m! {
+            TokenStream {
+                fn new() -> $S::TokenStream;
+            },
+            Group {
+            },
+        }
+    };
+}
+macro_rules! associated_item {
+    (type TokenStream) =>
+        (type TokenStream: 'static + Clone;);
+    (type Group) =>
+        (type Group: 'static + Clone;);
+    ($($item:tt)*) => ($($item)*;)
+}
+macro_rules! declare_server_traits {
+    ($($name:ident {
+        $(fn $method:ident($($arg:ident: $arg_ty:ty),* $(,)?) $(-> $ret_ty:ty)?;)*
+    }),* $(,)?) => {
+        pub trait Types {
+            $(associated_item!(type $name);)*
+        }
+
+        $(pub trait $name: Types {
+            $(associated_item!(fn $method(&mut self, $($arg: $arg_ty),*) $(-> $ret_ty)?);)*
+        })*
+
+        pub trait Server: Types $(+ $name)* {}
+        impl<S: Types $(+ $name)*> Server for S {}
+    }
+}
+with_api!(Self, self_, declare_server_traits);
+struct Group {}
+struct TokenStream {}
+struct Rustc;
+impl Types for Rustc {
+    type TokenStream = TokenStream;
+    type Group = Group;
+}
+fn make<T>() -> T { loop {} }
+impl TokenStream for Rustc {
+    fn new() -> Self::TokenStream {
+        let group: Self::Group = make();
+        make()
+    }
+}
+"#, true),
+        @r###"
+    [1115; 1126) '{ loop {} }': T
+    [1117; 1124) 'loop {}': !
+    [1122; 1124) '{}': ()
+    [1190; 1253) '{     ...     }': {unknown}
+    [1204; 1209) 'group': {unknown}
+    [1225; 1229) 'make': fn make<{unknown}>() -> {unknown}
+    [1225; 1231) 'make()': {unknown}
+    [1241; 1245) 'make': fn make<{unknown}>() -> {unknown}
+    [1241; 1247) 'make()': {unknown}
+    "###
+    );
+}
+
+#[test]
 fn unify_impl_trait() {
     assert_snapshot!(
         infer_with_mismatches(r#"
@@ -2023,6 +2154,33 @@ fn main() {
 }
 
 #[test]
+fn associated_type_bound() {
+    let t = type_at(
+        r#"
+//- /main.rs
+pub trait Trait {
+    type Item: OtherTrait<u32>;
+}
+pub trait OtherTrait<T> {
+    fn foo(&self) -> T;
+}
+
+// this is just a workaround for chalk#234
+pub struct S<T>;
+impl<T: Trait> Trait for S<T> {
+    type Item = <T as Trait>::Item;
+}
+
+fn test<T: Trait>() {
+    let y: <S<T> as Trait>::Item = no_matter;
+    y.foo()<|>;
+}
+"#,
+    );
+    assert_eq!(t, "u32");
+}
+
+#[test]
 fn dyn_trait_through_chalk() {
     let t = type_at(
         r#"
diff --git a/crates/ra_hir_ty/src/traits.rs b/crates/ra_hir_ty/src/traits.rs
index 43d8d1e80..05791a848 100644
--- a/crates/ra_hir_ty/src/traits.rs
+++ b/crates/ra_hir_ty/src/traits.rs
@@ -16,10 +16,12 @@ use self::chalk::{from_chalk, Interner, ToChalk};
 pub(crate) mod chalk;
 mod builtin;
 
-/// This controls the maximum size of types Chalk considers. If we set this too
-/// high, we can run into slow edge cases; if we set it too low, Chalk won't
-/// find some solutions.
-const CHALK_SOLVER_MAX_SIZE: usize = 10;
+// This controls the maximum size of types Chalk considers. If we set this too
+// high, we can run into slow edge cases; if we set it too low, Chalk won't
+// find some solutions.
+// FIXME this is currently hardcoded in the recursive solver
+// const CHALK_SOLVER_MAX_SIZE: usize = 10;
+
 /// This controls how much 'time' we give the Chalk solver before giving up.
 const CHALK_SOLVER_FUEL: i32 = 100;
 
@@ -30,8 +32,7 @@ struct ChalkContext<'a> {
 }
 
 fn create_chalk_solver() -> chalk_solve::Solver<Interner> {
-    let solver_choice =
-        chalk_solve::SolverChoice::SLG { max_size: CHALK_SOLVER_MAX_SIZE, expected_answers: None };
+    let solver_choice = chalk_solve::SolverChoice::recursive();
     solver_choice.into_solver()
 }
 
@@ -194,13 +195,16 @@ fn solve(
         }
         remaining > 0
     };
-    let mut solve = || solver.solve_limited(&context, goal, should_continue);
+    let mut solve = || {
+        let solution = solver.solve_limited(&context, goal, should_continue);
+        log::debug!("solve({:?}) => {:?}", goal, solution);
+        solution
+    };
     // don't set the TLS for Chalk unless Chalk debugging is active, to make
     // extra sure we only use it for debugging
     let solution =
         if is_chalk_debug() { chalk::tls::set_current_program(db, solve) } else { solve() };
 
-    log::debug!("solve({:?}) => {:?}", goal, solution);
     solution
 }
 
diff --git a/crates/ra_hir_ty/src/traits/chalk.rs b/crates/ra_hir_ty/src/traits/chalk.rs
index e05fea843..60d70d18e 100644
--- a/crates/ra_hir_ty/src/traits/chalk.rs
+++ b/crates/ra_hir_ty/src/traits/chalk.rs
@@ -32,6 +32,9 @@ impl chalk_ir::interner::Interner for Interner {
     type InternedGoal = Arc<GoalData<Self>>;
     type InternedGoals = Vec<Goal<Self>>;
     type InternedSubstitution = Vec<Parameter<Self>>;
+    type InternedProgramClause = chalk_ir::ProgramClauseData<Self>;
+    type InternedProgramClauses = Vec<chalk_ir::ProgramClause<Self>>;
+    type InternedQuantifiedWhereClauses = Vec<chalk_ir::QuantifiedWhereClause<Self>>;
     type Identifier = TypeAliasId;
     type DefId = InternId;
 
@@ -181,6 +184,48 @@ impl chalk_ir::interner::Interner for Interner {
     ) -> &'a [Parameter<Self>] {
         substitution
     }
+
+    fn intern_program_clause(
+        &self,
+        data: chalk_ir::ProgramClauseData<Self>,
+    ) -> chalk_ir::ProgramClauseData<Self> {
+        data
+    }
+
+    fn program_clause_data<'a>(
+        &self,
+        clause: &'a chalk_ir::ProgramClauseData<Self>,
+    ) -> &'a chalk_ir::ProgramClauseData<Self> {
+        clause
+    }
+
+    fn intern_program_clauses(
+        &self,
+        data: impl IntoIterator<Item = chalk_ir::ProgramClause<Self>>,
+    ) -> Vec<chalk_ir::ProgramClause<Self>> {
+        data.into_iter().collect()
+    }
+
+    fn program_clauses_data<'a>(
+        &self,
+        clauses: &'a Vec<chalk_ir::ProgramClause<Self>>,
+    ) -> &'a [chalk_ir::ProgramClause<Self>] {
+        clauses
+    }
+
+    fn intern_quantified_where_clauses(
+        &self,
+        data: impl IntoIterator<Item = chalk_ir::QuantifiedWhereClause<Self>>,
+    ) -> Self::InternedQuantifiedWhereClauses {
+        data.into_iter().collect()
+    }
+
+    fn quantified_where_clauses_data<'a>(
+        &self,
+        clauses: &'a Self::InternedQuantifiedWhereClauses,
+    ) -> &'a [chalk_ir::QuantifiedWhereClause<Self>] {
+        clauses
+    }
 }
 
 impl chalk_ir::interner::HasInterner for Interner {
@@ -238,12 +283,10 @@ impl ToChalk for Ty {
             Ty::Bound(idx) => chalk_ir::TyData::BoundVar(idx).intern(&Interner),
             Ty::Infer(_infer_ty) => panic!("uncanonicalized infer ty"),
             Ty::Dyn(predicates) => {
-                let where_clauses = predicates
-                    .iter()
-                    .filter(|p| !p.is_error())
-                    .cloned()
-                    .map(|p| p.to_chalk(db))
-                    .collect();
+                let where_clauses = chalk_ir::QuantifiedWhereClauses::from(
+                    &Interner,
+                    predicates.iter().filter(|p| !p.is_error()).cloned().map(|p| p.to_chalk(db)),
+                );
                 let bounded_ty = chalk_ir::DynTy { bounds: make_binders(where_clauses, 1) };
                 chalk_ir::TyData::Dyn(bounded_ty).intern(&Interner)
             }
@@ -281,8 +324,12 @@ impl ToChalk for Ty {
             chalk_ir::TyData::InferenceVar(_iv) => Ty::Unknown,
             chalk_ir::TyData::Dyn(where_clauses) => {
                 assert_eq!(where_clauses.bounds.binders.len(), 1);
-                let predicates =
-                    where_clauses.bounds.value.into_iter().map(|c| from_chalk(db, c)).collect();
+                let predicates = where_clauses
+                    .bounds
+                    .skip_binders()
+                    .iter(&Interner)
+                    .map(|c| from_chalk(db, c.clone()))
+                    .collect();
                 Ty::Dyn(predicates)
             }
         }
@@ -426,7 +473,7 @@ impl ToChalk for GenericPredicate {
     ) -> GenericPredicate {
         // we don't produce any where clauses with binders and can't currently deal with them
         match where_clause
-            .value
+            .skip_binders()
             .shifted_out(&Interner)
             .expect("unexpected bound vars in where clause")
         {
@@ -464,13 +511,13 @@ impl ToChalk for ProjectionTy {
 }
 
 impl ToChalk for super::ProjectionPredicate {
-    type Chalk = chalk_ir::Normalize<Interner>;
+    type Chalk = chalk_ir::AliasEq<Interner>;
 
-    fn to_chalk(self, db: &dyn HirDatabase) -> chalk_ir::Normalize<Interner> {
-        chalk_ir::Normalize { alias: self.projection_ty.to_chalk(db), ty: self.ty.to_chalk(db) }
+    fn to_chalk(self, db: &dyn HirDatabase) -> chalk_ir::AliasEq<Interner> {
+        chalk_ir::AliasEq { alias: self.projection_ty.to_chalk(db), ty: self.ty.to_chalk(db) }
     }
 
-    fn from_chalk(_db: &dyn HirDatabase, _normalize: chalk_ir::Normalize<Interner>) -> Self {
+    fn from_chalk(_db: &dyn HirDatabase, _normalize: chalk_ir::AliasEq<Interner>) -> Self {
         unimplemented!()
     }
 }
@@ -521,7 +568,7 @@ impl ToChalk for Arc<super::TraitEnvironment> {
                 pred.clone().to_chalk(db).cast(&Interner);
             clauses.push(program_clause.into_from_env_clause(&Interner));
         }
-        chalk_ir::Environment::new().add_clauses(clauses)
+        chalk_ir::Environment::new(&Interner).add_clauses(&Interner, clauses)
     }
 
     fn from_chalk(
@@ -603,10 +650,10 @@ impl ToChalk for builtin::BuiltinImplAssocTyValueData {
 }
 
 fn make_binders<T>(value: T, num_vars: usize) -> chalk_ir::Binders<T> {
-    chalk_ir::Binders {
+    chalk_ir::Binders::new(
+        std::iter::repeat(chalk_ir::ParameterKind::Ty(())).take(num_vars).collect(),
         value,
-        binders: std::iter::repeat(chalk_ir::ParameterKind::Ty(())).take(num_vars).collect(),
-    }
+    )
 }
 
 fn convert_where_clauses(
@@ -626,6 +673,55 @@ fn convert_where_clauses(
     result
 }
 
+fn generic_predicate_to_inline_bound(
+    db: &dyn HirDatabase,
+    pred: &GenericPredicate,
+    self_ty: &Ty,
+) -> Option<chalk_rust_ir::InlineBound<Interner>> {
+    // An InlineBound is like a GenericPredicate, except the self type is left out.
+    // We don't have a special type for this, but Chalk does.
+    match pred {
+        GenericPredicate::Implemented(trait_ref) => {
+            if &trait_ref.substs[0] != self_ty {
+                // we can only convert predicates back to type bounds if they
+                // have the expected self type
+                return None;
+            }
+            let args_no_self = trait_ref.substs[1..]
+                .iter()
+                .map(|ty| ty.clone().to_chalk(db).cast(&Interner))
+                .collect();
+            let trait_bound =
+                chalk_rust_ir::TraitBound { trait_id: trait_ref.trait_.to_chalk(db), args_no_self };
+            Some(chalk_rust_ir::InlineBound::TraitBound(trait_bound))
+        }
+        GenericPredicate::Projection(proj) => {
+            if &proj.projection_ty.parameters[0] != self_ty {
+                return None;
+            }
+            let trait_ = match proj.projection_ty.associated_ty.lookup(db.upcast()).container {
+                AssocContainerId::TraitId(t) => t,
+                _ => panic!("associated type not in trait"),
+            };
+            let args_no_self = proj.projection_ty.parameters[1..]
+                .iter()
+                .map(|ty| ty.clone().to_chalk(db).cast(&Interner))
+                .collect();
+            let alias_eq_bound = chalk_rust_ir::AliasEqBound {
+                value: proj.ty.clone().to_chalk(db),
+                trait_bound: chalk_rust_ir::TraitBound {
+                    trait_id: trait_.to_chalk(db),
+                    args_no_self,
+                },
+                associated_ty_id: proj.projection_ty.associated_ty.to_chalk(db),
+                parameters: Vec::new(), // FIXME we don't support generic associated types yet
+            };
+            Some(chalk_rust_ir::InlineBound::AliasEqBound(alias_eq_bound))
+        }
+        GenericPredicate::Error => None,
+    }
+}
+
 impl<'a> chalk_solve::RustIrDatabase<Interner> for ChalkContext<'a> {
     fn associated_ty_data(&self, id: AssocTypeId) -> Arc<AssociatedTyDatum> {
         self.db.associated_ty_data(id)
@@ -696,6 +792,13 @@ impl<'a> chalk_solve::RustIrDatabase<Interner> for ChalkContext<'a> {
     fn interner(&self) -> &Interner {
         &Interner
     }
+    fn well_known_trait_id(
+        &self,
+        _well_known_trait: chalk_rust_ir::WellKnownTrait,
+    ) -> Option<chalk_ir::TraitId<Interner>> {
+        // FIXME tell Chalk about well-known traits (here and in trait_datum)
+        None
+    }
 }
 
 pub(crate) fn associated_ty_data_query(
@@ -708,12 +811,25 @@ pub(crate) fn associated_ty_data_query(
         AssocContainerId::TraitId(t) => t,
         _ => panic!("associated type not in trait"),
     };
+
+    // Lower bounds -- we could/should maybe move this to a separate query in `lower`
+    let type_alias_data = db.type_alias_data(type_alias);
     let generic_params = generics(db.upcast(), type_alias.into());
-    let bound_data = chalk_rust_ir::AssociatedTyDatumBound {
-        // FIXME add bounds and where clauses
-        bounds: vec![],
-        where_clauses: vec![],
-    };
+    let bound_vars = Substs::bound_vars(&generic_params);
+    let resolver = hir_def::resolver::HasResolver::resolver(type_alias, db.upcast());
+    let ctx = crate::TyLoweringContext::new(db, &resolver)
+        .with_type_param_mode(crate::lower::TypeParamLoweringMode::Variable);
+    let self_ty = Ty::Bound(crate::BoundVar::new(crate::DebruijnIndex::INNERMOST, 0));
+    let bounds = type_alias_data
+        .bounds
+        .iter()
+        .flat_map(|bound| GenericPredicate::from_type_bound(&ctx, bound, self_ty.clone()))
+        .filter_map(|pred| generic_predicate_to_inline_bound(db, &pred, &self_ty))
+        .map(|bound| make_binders(bound.shifted_in(&Interner), 0))
+        .collect();
+
+    let where_clauses = convert_where_clauses(db, type_alias.into(), &bound_vars);
+    let bound_data = chalk_rust_ir::AssociatedTyDatumBound { bounds, where_clauses };
     let datum = AssociatedTyDatum {
         trait_id: trait_.to_chalk(db),
         id,
diff --git a/crates/ra_hir_ty/src/traits/chalk/tls.rs b/crates/ra_hir_ty/src/traits/chalk/tls.rs
index d9bbb54a5..fa8e4d1ad 100644
--- a/crates/ra_hir_ty/src/traits/chalk/tls.rs
+++ b/crates/ra_hir_ty/src/traits/chalk/tls.rs
@@ -2,10 +2,11 @@
 use std::fmt;
 
 use chalk_ir::{AliasTy, Goal, Goals, Lifetime, Parameter, ProgramClauseImplication, TypeName};
+use itertools::Itertools;
 
 use super::{from_chalk, Interner};
 use crate::{db::HirDatabase, CallableDef, TypeCtor};
-use hir_def::{AdtId, AssocContainerId, Lookup, TypeAliasId};
+use hir_def::{AdtId, AssocContainerId, DefWithBodyId, Lookup, TypeAliasId};
 
 pub use unsafe_tls::{set_current_program, with_current_program};
 
@@ -69,7 +70,27 @@ impl DebugContext<'_> {
                 write!(f, "{}::{}", trait_name, name)?;
             }
             TypeCtor::Closure { def, expr } => {
-                write!(f, "{{closure {:?} in {:?}}}", expr.into_raw(), def)?;
+                write!(f, "{{closure {:?} in ", expr.into_raw())?;
+                match def {
+                    DefWithBodyId::FunctionId(func) => {
+                        write!(f, "fn {}", self.0.function_data(func).name)?
+                    }
+                    DefWithBodyId::StaticId(s) => {
+                        if let Some(name) = self.0.static_data(s).name.as_ref() {
+                            write!(f, "body of static {}", name)?;
+                        } else {
+                            write!(f, "body of unnamed static {:?}", s)?;
+                        }
+                    }
+                    DefWithBodyId::ConstId(c) => {
+                        if let Some(name) = self.0.const_data(c).name.as_ref() {
+                            write!(f, "body of const {}", name)?;
+                        } else {
+                            write!(f, "body of unnamed const {:?}", c)?;
+                        }
+                    }
+                };
+                write!(f, "}}")?;
             }
         }
         Ok(())
@@ -113,14 +134,15 @@ impl DebugContext<'_> {
         };
         let trait_data = self.0.trait_data(trait_);
         let params = alias.substitution.parameters(&Interner);
-        write!(
-            fmt,
-            "<{:?} as {}<{:?}>>::{}",
-            &params[0],
-            trait_data.name,
-            &params[1..],
-            type_alias_data.name
-        )
+        write!(fmt, "<{:?} as {}", &params[0], trait_data.name,)?;
+        if params.len() > 1 {
+            write!(
+                fmt,
+                "<{}>",
+                &params[1..].iter().format_with(", ", |x, f| f(&format_args!("{:?}", x))),
+            )?;
+        }
+        write!(fmt, ">::{}", type_alias_data.name)
     }
 
     pub fn debug_ty(
diff --git a/crates/ra_ide/Cargo.toml b/crates/ra_ide/Cargo.toml
index b4a29b81b..05c940605 100644
--- a/crates/ra_ide/Cargo.toml
+++ b/crates/ra_ide/Cargo.toml
@@ -35,4 +35,4 @@ ra_assists = { path = "../ra_assists" }
 hir = { path = "../ra_hir", package = "ra_hir" }
 
 [dev-dependencies]
-insta = "0.15.0"
+insta = "0.16.0"
diff --git a/crates/ra_ide/src/display/navigation_target.rs b/crates/ra_ide/src/display/navigation_target.rs
index e61846995..6289f53f3 100644
--- a/crates/ra_ide/src/display/navigation_target.rs
+++ b/crates/ra_ide/src/display/navigation_target.rs
@@ -175,7 +175,7 @@ impl ToNav for FileSymbol {
         NavigationTarget {
             file_id: self.file_id,
             name: self.name.clone(),
-            kind: self.ptr.kind(),
+            kind: self.kind,
             full_range: self.ptr.range(),
             focus_range: self.name_range,
             container_name: self.container_name.clone(),
diff --git a/crates/ra_ide_db/src/symbol_index.rs b/crates/ra_ide_db/src/symbol_index.rs
index d30458d86..937abb433 100644
--- a/crates/ra_ide_db/src/symbol_index.rs
+++ b/crates/ra_ide_db/src/symbol_index.rs
@@ -285,7 +285,7 @@ impl Query {
                 let (start, end) = SymbolIndex::map_value_to_range(indexed_value.value);
 
                 for symbol in &symbol_index.symbols[start..end] {
-                    if self.only_types && !is_type(symbol.ptr.kind()) {
+                    if self.only_types && !is_type(symbol.kind) {
                         continue;
                     }
                     if self.exact && symbol.name != self.query {
@@ -312,6 +312,7 @@ fn is_type(kind: SyntaxKind) -> bool {
 pub struct FileSymbol {
     pub file_id: FileId,
     pub name: SmolStr,
+    pub kind: SyntaxKind,
     pub ptr: SyntaxNodePtr,
     pub name_range: Option<TextRange>,
     pub container_name: Option<SmolStr>,
@@ -377,6 +378,7 @@ fn to_symbol(node: &SyntaxNode) -> Option<(SmolStr, SyntaxNodePtr, TextRange)> {
 fn to_file_symbol(node: &SyntaxNode, file_id: FileId) -> Option<FileSymbol> {
     to_symbol(node).map(move |(name, ptr, name_range)| FileSymbol {
         name,
+        kind: node.kind(),
         ptr,
         file_id,
         name_range: Some(name_range),
diff --git a/crates/ra_mbe/src/syntax_bridge.rs b/crates/ra_mbe/src/syntax_bridge.rs
index 9fb5cb058..31e9b22e7 100644
--- a/crates/ra_mbe/src/syntax_bridge.rs
+++ b/crates/ra_mbe/src/syntax_bridge.rs
@@ -607,12 +607,13 @@ impl<'a> TreeSink for TtTreeSink<'a> {
             let text: SmolStr = match self.cursor.token_tree() {
                 Some(tt::TokenTree::Leaf(leaf)) => {
                     // Mark the range if needed
-                    let id = match leaf {
-                        tt::Leaf::Ident(ident) => ident.id,
-                        tt::Leaf::Punct(punct) => punct.id,
-                        tt::Leaf::Literal(lit) => lit.id,
+                    let (text, id) = match leaf {
+                        tt::Leaf::Ident(ident) => (ident.text.clone(), ident.id),
+                        tt::Leaf::Punct(punct) => {
+                            (SmolStr::new_inline_from_ascii(1, &[punct.char as u8]), punct.id)
+                        }
+                        tt::Leaf::Literal(lit) => (lit.text.clone(), lit.id),
                     };
-                    let text = SmolStr::new(format!("{}", leaf));
                     let range = TextRange::offset_len(self.text_pos, TextUnit::of_str(&text));
                     self.token_map.insert(id, range);
                     self.cursor = self.cursor.bump();
diff --git a/crates/ra_proc_macro/src/lib.rs b/crates/ra_proc_macro/src/lib.rs
index 63da9f1b4..b200fd126 100644
--- a/crates/ra_proc_macro/src/lib.rs
+++ b/crates/ra_proc_macro/src/lib.rs
@@ -12,6 +12,7 @@ pub mod msg;
 use process::{ProcMacroProcessSrv, ProcMacroProcessThread};
 use ra_tt::{SmolStr, Subtree};
 use std::{
+    ffi::OsStr,
     path::{Path, PathBuf},
     sync::Arc,
 };
@@ -56,8 +57,15 @@ pub struct ProcMacroClient {
 }
 
 impl ProcMacroClient {
-    pub fn extern_process(process_path: &Path) -> Result<ProcMacroClient, std::io::Error> {
-        let (thread, process) = ProcMacroProcessSrv::run(process_path)?;
+    pub fn extern_process<I, S>(
+        process_path: &Path,
+        args: I,
+    ) -> Result<ProcMacroClient, std::io::Error>
+    where
+        I: IntoIterator<Item = S>,
+        S: AsRef<OsStr>,
+    {
+        let (thread, process) = ProcMacroProcessSrv::run(process_path, args)?;
         Ok(ProcMacroClient {
             kind: ProcMacroClientKind::Process { process: Arc::new(process), thread },
         })
diff --git a/crates/ra_proc_macro/src/process.rs b/crates/ra_proc_macro/src/process.rs
index e8c85be38..f851570bc 100644
--- a/crates/ra_proc_macro/src/process.rs
+++ b/crates/ra_proc_macro/src/process.rs
@@ -9,6 +9,7 @@ use crate::rpc::{ExpansionResult, ExpansionTask, ListMacrosResult, ListMacrosTas
 use io::{BufRead, BufReader};
 use std::{
     convert::{TryFrom, TryInto},
+    ffi::OsStr,
     io::{self, Write},
     path::{Path, PathBuf},
     process::{Child, Command, Stdio},
@@ -44,8 +45,13 @@ impl Drop for Process {
 }
 
 impl Process {
-    fn run(process_path: &Path) -> Result<Process, io::Error> {
+    fn run<I, S>(process_path: &Path, args: I) -> Result<Process, io::Error>
+    where
+        I: IntoIterator<Item = S>,
+        S: AsRef<OsStr>,
+    {
         let child = Command::new(process_path.clone())
+            .args(args)
             .stdin(Stdio::piped())
             .stdout(Stdio::piped())
             .stderr(Stdio::null())
@@ -74,10 +80,15 @@ impl Process {
 }
 
 impl ProcMacroProcessSrv {
-    pub fn run(
+    pub fn run<I, S>(
         process_path: &Path,
-    ) -> Result<(ProcMacroProcessThread, ProcMacroProcessSrv), io::Error> {
-        let process = Process::run(process_path)?;
+        args: I,
+    ) -> Result<(ProcMacroProcessThread, ProcMacroProcessSrv), io::Error>
+    where
+        I: IntoIterator<Item = S>,
+        S: AsRef<OsStr>,
+    {
+        let process = Process::run(process_path, args)?;
 
         let (task_tx, task_rx) = bounded(0);
         let handle = jod_thread::spawn(move || {
diff --git a/crates/ra_proc_macro_srv/src/main.rs b/crates/ra_proc_macro_srv/src/cli.rs
index 70743c1f4..c771f2b38 100644
--- a/crates/ra_proc_macro_srv/src/main.rs
+++ b/crates/ra_proc_macro_srv/src/cli.rs
@@ -1,7 +1,7 @@
 //! Driver for proc macro server
 
+use crate::{expand_task, list_macros};
 use ra_proc_macro::msg::{self, Message};
-use ra_proc_macro_srv::{expand_task, list_macros};
 
 use std::io;
 
@@ -24,7 +24,8 @@ fn write_response(res: Result<msg::Response, String>) -> Result<(), io::Error> {
     let mut stdout = stdout.lock();
     msg.write(&mut stdout)
 }
-fn main() {
+
+pub fn run() {
     loop {
         let req = match read_request() {
             Err(err) => {
diff --git a/crates/ra_proc_macro_srv/src/lib.rs b/crates/ra_proc_macro_srv/src/lib.rs
index 59716cbb3..c62b0ed89 100644
--- a/crates/ra_proc_macro_srv/src/lib.rs
+++ b/crates/ra_proc_macro_srv/src/lib.rs
@@ -22,7 +22,7 @@ mod dylib;
 use proc_macro::bridge::client::TokenStream;
 use ra_proc_macro::{ExpansionResult, ExpansionTask, ListMacrosResult, ListMacrosTask};
 
-pub fn expand_task(task: &ExpansionTask) -> Result<ExpansionResult, String> {
+pub(crate) fn expand_task(task: &ExpansionTask) -> Result<ExpansionResult, String> {
     let expander = dylib::Expander::new(&task.lib)
         .expect(&format!("Cannot expand with provided libraries: ${:?}", &task.lib));
 
@@ -39,7 +39,7 @@ pub fn expand_task(task: &ExpansionTask) -> Result<ExpansionResult, String> {
     }
 }
 
-pub fn list_macros(task: &ListMacrosTask) -> Result<ListMacrosResult, String> {
+pub(crate) fn list_macros(task: &ListMacrosTask) -> Result<ListMacrosResult, String> {
     let expander = dylib::Expander::new(&task.lib)
         .expect(&format!("Cannot expand with provided libraries: ${:?}", &task.lib));
 
@@ -53,5 +53,7 @@ pub fn list_macros(task: &ListMacrosTask) -> Result<ListMacrosResult, String> {
     }
 }
 
+pub mod cli;
+
 #[cfg(test)]
 mod tests;
diff --git a/crates/ra_project_model/src/lib.rs b/crates/ra_project_model/src/lib.rs
index 0ab64a1e0..03f2629da 100644
--- a/crates/ra_project_model/src/lib.rs
+++ b/crates/ra_project_model/src/lib.rs
@@ -5,9 +5,8 @@ mod json_project;
 mod sysroot;
 
 use std::{
-    error::Error,
     fs::{read_dir, File, ReadDir},
-    io::BufReader,
+    io::{self, BufReader},
     path::{Path, PathBuf},
     process::Command,
 };
@@ -25,25 +24,6 @@ pub use crate::{
 };
 pub use ra_proc_macro::ProcMacroClient;
 
-#[derive(Clone, PartialEq, Eq, Hash, Debug)]
-pub struct CargoTomlNotFoundError {
-    pub searched_at: PathBuf,
-    pub reason: String,
-}
-
-impl std::fmt::Display for CargoTomlNotFoundError {
-    fn fmt(&self, fmt: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-        write!(
-            fmt,
-            "can't find Cargo.toml at {}, due to {}",
-            self.searched_at.display(),
-            self.reason
-        )
-    }
-}
-
-impl Error for CargoTomlNotFoundError {}
-
 #[derive(Debug, Clone)]
 pub enum ProjectWorkspace {
     /// Project workspace was discovered by running `cargo metadata` and `rustc --print sysroot`.
@@ -77,31 +57,119 @@ impl PackageRoot {
     }
 }
 
-impl ProjectWorkspace {
-    pub fn discover(path: &Path, cargo_features: &CargoConfig) -> Result<ProjectWorkspace> {
-        ProjectWorkspace::discover_with_sysroot(path, true, cargo_features)
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub enum ProjectRoot {
+    ProjectJson(PathBuf),
+    CargoToml(PathBuf),
+}
+
+impl ProjectRoot {
+    pub fn from_manifest_file(path: PathBuf) -> Result<ProjectRoot> {
+        if path.ends_with("rust-project.json") {
+            return Ok(ProjectRoot::ProjectJson(path));
+        }
+        if path.ends_with("Cargo.toml") {
+            return Ok(ProjectRoot::CargoToml(path));
+        }
+        bail!("project root must point to Cargo.toml or rust-project.json: {}", path.display())
     }
 
-    pub fn discover_with_sysroot(
-        path: &Path,
-        with_sysroot: bool,
+    pub fn discover_single(path: &Path) -> Result<ProjectRoot> {
+        let mut candidates = ProjectRoot::discover(path)?;
+        let res = match candidates.pop() {
+            None => bail!("no projects"),
+            Some(it) => it,
+        };
+
+        if !candidates.is_empty() {
+            bail!("more than one project")
+        }
+        Ok(res)
+    }
+
+    pub fn discover(path: &Path) -> io::Result<Vec<ProjectRoot>> {
+        if let Some(project_json) = find_rust_project_json(path) {
+            return Ok(vec![ProjectRoot::ProjectJson(project_json)]);
+        }
+        return find_cargo_toml(path)
+            .map(|paths| paths.into_iter().map(ProjectRoot::CargoToml).collect());
+
+        fn find_rust_project_json(path: &Path) -> Option<PathBuf> {
+            if path.ends_with("rust-project.json") {
+                return Some(path.to_path_buf());
+            }
+
+            let mut curr = Some(path);
+            while let Some(path) = curr {
+                let candidate = path.join("rust-project.json");
+                if candidate.exists() {
+                    return Some(candidate);
+                }
+                curr = path.parent();
+            }
+
+            None
+        }
+
+        fn find_cargo_toml(path: &Path) -> io::Result<Vec<PathBuf>> {
+            if path.ends_with("Cargo.toml") {
+                return Ok(vec![path.to_path_buf()]);
+            }
+
+            if let Some(p) = find_cargo_toml_in_parent_dir(path) {
+                return Ok(vec![p]);
+            }
+
+            let entities = read_dir(path)?;
+            Ok(find_cargo_toml_in_child_dir(entities))
+        }
+
+        fn find_cargo_toml_in_parent_dir(path: &Path) -> Option<PathBuf> {
+            let mut curr = Some(path);
+            while let Some(path) = curr {
+                let candidate = path.join("Cargo.toml");
+                if candidate.exists() {
+                    return Some(candidate);
+                }
+                curr = path.parent();
+            }
+
+            None
+        }
+
+        fn find_cargo_toml_in_child_dir(entities: ReadDir) -> Vec<PathBuf> {
+            // Only one level down to avoid cycles the easy way and stop a runaway scan with large projects
+            let mut valid_canditates = vec![];
+            for entity in entities.filter_map(Result::ok) {
+                let candidate = entity.path().join("Cargo.toml");
+                if candidate.exists() {
+                    valid_canditates.push(candidate)
+                }
+            }
+            valid_canditates
+        }
+    }
+}
+
+impl ProjectWorkspace {
+    pub fn load(
+        root: ProjectRoot,
         cargo_features: &CargoConfig,
+        with_sysroot: bool,
     ) -> Result<ProjectWorkspace> {
-        match find_rust_project_json(path) {
-            Some(json_path) => {
-                let file = File::open(&json_path)
-                    .with_context(|| format!("Failed to open json file {}", json_path.display()))?;
+        let res = match root {
+            ProjectRoot::ProjectJson(project_json) => {
+                let file = File::open(&project_json).with_context(|| {
+                    format!("Failed to open json file {}", project_json.display())
+                })?;
                 let reader = BufReader::new(file);
-                Ok(ProjectWorkspace::Json {
+                ProjectWorkspace::Json {
                     project: from_reader(reader).with_context(|| {
-                        format!("Failed to deserialize json file {}", json_path.display())
+                        format!("Failed to deserialize json file {}", project_json.display())
                     })?,
-                })
+                }
             }
-            None => {
-                let cargo_toml = find_cargo_toml(path).with_context(|| {
-                    format!("Failed to find Cargo.toml for path {}", path.display())
-                })?;
+            ProjectRoot::CargoToml(cargo_toml) => {
                 let cargo = CargoWorkspace::from_cargo_metadata(&cargo_toml, cargo_features)
                     .with_context(|| {
                         format!(
@@ -119,9 +187,11 @@ impl ProjectWorkspace {
                 } else {
                     Sysroot::default()
                 };
-                Ok(ProjectWorkspace::Cargo { cargo, sysroot })
+                ProjectWorkspace::Cargo { cargo, sysroot }
             }
-        }
+        };
+
+        Ok(res)
     }
 
     /// Returns the roots for the current `ProjectWorkspace`
@@ -469,87 +539,6 @@ impl ProjectWorkspace {
     }
 }
 
-fn find_rust_project_json(path: &Path) -> Option<PathBuf> {
-    if path.ends_with("rust-project.json") {
-        return Some(path.to_path_buf());
-    }
-
-    let mut curr = Some(path);
-    while let Some(path) = curr {
-        let candidate = path.join("rust-project.json");
-        if candidate.exists() {
-            return Some(candidate);
-        }
-        curr = path.parent();
-    }
-
-    None
-}
-
-fn find_cargo_toml_in_parent_dir(path: &Path) -> Option<PathBuf> {
-    let mut curr = Some(path);
-    while let Some(path) = curr {
-        let candidate = path.join("Cargo.toml");
-        if candidate.exists() {
-            return Some(candidate);
-        }
-        curr = path.parent();
-    }
-
-    None
-}
-
-fn find_cargo_toml_in_child_dir(entities: ReadDir) -> Vec<PathBuf> {
-    // Only one level down to avoid cycles the easy way and stop a runaway scan with large projects
-    let mut valid_canditates = vec![];
-    for entity in entities.filter_map(Result::ok) {
-        let candidate = entity.path().join("Cargo.toml");
-        if candidate.exists() {
-            valid_canditates.push(candidate)
-        }
-    }
-    valid_canditates
-}
-
-fn find_cargo_toml(path: &Path) -> Result<PathBuf> {
-    if path.ends_with("Cargo.toml") {
-        return Ok(path.to_path_buf());
-    }
-
-    if let Some(p) = find_cargo_toml_in_parent_dir(path) {
-        return Ok(p);
-    }
-
-    let entities = match read_dir(path) {
-        Ok(entities) => entities,
-        Err(e) => {
-            return Err(CargoTomlNotFoundError {
-                searched_at: path.to_path_buf(),
-                reason: format!("file system error: {}", e),
-            }
-            .into());
-        }
-    };
-
-    let mut valid_canditates = find_cargo_toml_in_child_dir(entities);
-    match valid_canditates.len() {
-        1 => Ok(valid_canditates.remove(0)),
-        0 => Err(CargoTomlNotFoundError {
-            searched_at: path.to_path_buf(),
-            reason: "no Cargo.toml file found".to_string(),
-        }
-        .into()),
-        _ => Err(CargoTomlNotFoundError {
-            searched_at: path.to_path_buf(),
-            reason: format!(
-                "multiple equally valid Cargo.toml files found: {:?}",
-                valid_canditates
-            ),
-        }
-        .into()),
-    }
-}
-
 pub fn get_rustc_cfg_options() -> CfgOptions {
     let mut cfg_options = CfgOptions::default();
 
diff --git a/crates/ra_syntax/src/algo.rs b/crates/ra_syntax/src/algo.rs
index 7f87f4212..ea41bf85d 100644
--- a/crates/ra_syntax/src/algo.rs
+++ b/crates/ra_syntax/src/algo.rs
@@ -351,7 +351,7 @@ fn with_children(
     // FIXME: use a more elegant way to re-fetch the node (#1185), make
     // `range` private afterwards
     let mut ptr = SyntaxNodePtr::new(parent);
-    ptr.range = TextRange::offset_len(ptr.range().start(), len);
+    ptr.range = TextRange::offset_len(ptr.range.start(), len);
     ptr.to_node(&new_root_node)
 }
 
diff --git a/crates/ra_syntax/src/ptr.rs b/crates/ra_syntax/src/ptr.rs
index bc48a2e71..3be648c2a 100644
--- a/crates/ra_syntax/src/ptr.rs
+++ b/crates/ra_syntax/src/ptr.rs
@@ -34,12 +34,8 @@ impl SyntaxNodePtr {
         self.range
     }
 
-    pub fn kind(&self) -> SyntaxKind {
-        self.kind
-    }
-
     pub fn cast<N: AstNode>(self) -> Option<AstPtr<N>> {
-        if !N::can_cast(self.kind()) {
+        if !N::can_cast(self.kind) {
             return None;
         }
         Some(AstPtr { raw: self, _ty: PhantomData })
@@ -88,7 +84,7 @@ impl<N: AstNode> AstPtr<N> {
     }
 
     pub fn cast<U: AstNode>(self) -> Option<AstPtr<U>> {
-        if !U::can_cast(self.raw.kind()) {
+        if !U::can_cast(self.raw.kind) {
             return None;
         }
         Some(AstPtr { raw: self.raw, _ty: PhantomData })
diff --git a/crates/rust-analyzer/Cargo.toml b/crates/rust-analyzer/Cargo.toml
index f5f773432..cee0248b6 100644
--- a/crates/rust-analyzer/Cargo.toml
+++ b/crates/rust-analyzer/Cargo.toml
@@ -46,7 +46,7 @@ ra_db = { path = "../ra_db" }
 hir = { path = "../ra_hir", package = "ra_hir" }
 hir_def = { path = "../ra_hir_def", package = "ra_hir_def" }
 hir_ty = { path = "../ra_hir_ty", package = "ra_hir_ty" }
-
+ra_proc_macro_srv = { path = "../ra_proc_macro_srv" }
 
 [target.'cfg(windows)'.dependencies]
 winapi = "0.3.8"
diff --git a/crates/rust-analyzer/src/bin/args.rs b/crates/rust-analyzer/src/bin/args.rs
index 3cf394bb4..5e19253a6 100644
--- a/crates/rust-analyzer/src/bin/args.rs
+++ b/crates/rust-analyzer/src/bin/args.rs
@@ -29,12 +29,23 @@ pub(crate) enum Command {
         with_deps: bool,
         path: PathBuf,
         load_output_dirs: bool,
+        with_proc_macro: bool,
     },
     Bench {
         path: PathBuf,
         what: BenchWhat,
         load_output_dirs: bool,
+        with_proc_macro: bool,
     },
+    Diagnostics {
+        path: PathBuf,
+        load_output_dirs: bool,
+        with_proc_macro: bool,
+        /// Include files which are not modules. In rust-analyzer
+        /// this would include the parser test files.
+        all: bool,
+    },
+    ProcMacro,
     RunServer,
     Version,
 }
@@ -141,6 +152,7 @@ FLAGS:
     -h, --help              Prints help information
         --memory-usage
         --load-output-dirs  Load OUT_DIR values by running `cargo check` before analysis
+        --with-proc-macro    Use ra-proc-macro-srv for proc-macro expanding
     -v, --verbose
     -q, --quiet
 
@@ -158,6 +170,7 @@ ARGS:
                 let only: Option<String> = matches.opt_value_from_str(["-o", "--only"])?;
                 let with_deps: bool = matches.contains("--with-deps");
                 let load_output_dirs = matches.contains("--load-output-dirs");
+                let with_proc_macro = matches.contains("--with-proc-macro");
                 let path = {
                     let mut trailing = matches.free()?;
                     if trailing.len() != 1 {
@@ -166,7 +179,15 @@ ARGS:
                     trailing.pop().unwrap().into()
                 };
 
-                Command::Stats { randomize, memory_usage, only, with_deps, path, load_output_dirs }
+                Command::Stats {
+                    randomize,
+                    memory_usage,
+                    only,
+                    with_deps,
+                    path,
+                    load_output_dirs,
+                    with_proc_macro,
+                }
             }
             "analysis-bench" => {
                 if matches.contains(["-h", "--help"]) {
@@ -180,6 +201,7 @@ USAGE:
 FLAGS:
     -h, --help          Prints help information
     --load-output-dirs  Load OUT_DIR values by running `cargo check` before analysis
+    --with-proc-macro    Use ra-proc-macro-srv for proc-macro expanding
     -v, --verbose
 
 OPTIONS:
@@ -207,8 +229,43 @@ ARGS:
                     ),
                 };
                 let load_output_dirs = matches.contains("--load-output-dirs");
-                Command::Bench { path, what, load_output_dirs }
+                let with_proc_macro = matches.contains("--with-proc-macro");
+                Command::Bench { path, what, load_output_dirs, with_proc_macro }
+            }
+            "diagnostics" => {
+                if matches.contains(["-h", "--help"]) {
+                    eprintln!(
+                        "\
+ra-cli-diagnostics
+
+USAGE:
+    rust-analyzer diagnostics [FLAGS] [PATH]
+
+FLAGS:
+    -h, --help              Prints help information
+        --load-output-dirs  Load OUT_DIR values by running `cargo check` before analysis
+        --all               Include all files rather than only modules
+
+ARGS:
+    <PATH>"
+                    );
+                    return Ok(Err(HelpPrinted));
+                }
+
+                let load_output_dirs = matches.contains("--load-output-dirs");
+                let with_proc_macro = matches.contains("--with-proc-macro");
+                let all = matches.contains("--all");
+                let path = {
+                    let mut trailing = matches.free()?;
+                    if trailing.len() != 1 {
+                        bail!("Invalid flags");
+                    }
+                    trailing.pop().unwrap().into()
+                };
+
+                Command::Diagnostics { path, load_output_dirs, with_proc_macro, all }
             }
+            "proc-macro" => Command::ProcMacro,
             _ => {
                 eprintln!(
                     "\
diff --git a/crates/rust-analyzer/src/bin/main.rs b/crates/rust-analyzer/src/bin/main.rs
index 608f4f67b..28b67cfe2 100644
--- a/crates/rust-analyzer/src/bin/main.rs
+++ b/crates/rust-analyzer/src/bin/main.rs
@@ -25,6 +25,7 @@ fn main() -> Result<()> {
             with_deps,
             path,
             load_output_dirs,
+            with_proc_macro,
         } => cli::analysis_stats(
             args.verbosity,
             memory_usage,
@@ -33,12 +34,24 @@ fn main() -> Result<()> {
             with_deps,
             randomize,
             load_output_dirs,
+            with_proc_macro,
         )?,
 
-        args::Command::Bench { path, what, load_output_dirs } => {
-            cli::analysis_bench(args.verbosity, path.as_ref(), what, load_output_dirs)?
+        args::Command::Bench { path, what, load_output_dirs, with_proc_macro } => {
+            cli::analysis_bench(
+                args.verbosity,
+                path.as_ref(),
+                what,
+                load_output_dirs,
+                with_proc_macro,
+            )?
         }
 
+        args::Command::Diagnostics { path, load_output_dirs, with_proc_macro, all } => {
+            cli::diagnostics(path.as_ref(), load_output_dirs, with_proc_macro, all)?
+        }
+
+        args::Command::ProcMacro => run_proc_macro_sv()?,
         args::Command::RunServer => run_server()?,
         args::Command::Version => println!("rust-analyzer {}", env!("REV")),
     }
@@ -52,6 +65,11 @@ fn setup_logging() -> Result<()> {
     Ok(())
 }
 
+fn run_proc_macro_sv() -> Result<()> {
+    ra_proc_macro_srv::cli::run();
+    Ok(())
+}
+
 fn run_server() -> Result<()> {
     log::info!("lifecycle: server started");
 
diff --git a/crates/rust-analyzer/src/cli.rs b/crates/rust-analyzer/src/cli.rs
index c9738d101..a865a7c7e 100644
--- a/crates/rust-analyzer/src/cli.rs
+++ b/crates/rust-analyzer/src/cli.rs
@@ -3,6 +3,7 @@
 mod load_cargo;
 mod analysis_stats;
 mod analysis_bench;
+mod diagnostics;
 mod progress_report;
 
 use std::io::Read;
@@ -12,6 +13,10 @@ use ra_ide::{file_structure, Analysis};
 use ra_prof::profile;
 use ra_syntax::{AstNode, SourceFile};
 
+pub use analysis_bench::{analysis_bench, BenchWhat, Position};
+pub use analysis_stats::analysis_stats;
+pub use diagnostics::diagnostics;
+
 #[derive(Clone, Copy)]
 pub enum Verbosity {
     Spammy,
@@ -60,9 +65,6 @@ pub fn highlight(rainbow: bool) -> Result<()> {
     Ok(())
 }
 
-pub use analysis_bench::{analysis_bench, BenchWhat, Position};
-pub use analysis_stats::analysis_stats;
-
 fn file() -> Result<SourceFile> {
     let text = read_stdin()?;
     Ok(SourceFile::parse(&text).tree())
diff --git a/crates/rust-analyzer/src/cli/analysis_bench.rs b/crates/rust-analyzer/src/cli/analysis_bench.rs
index 7667873d5..6147ae207 100644
--- a/crates/rust-analyzer/src/cli/analysis_bench.rs
+++ b/crates/rust-analyzer/src/cli/analysis_bench.rs
@@ -47,12 +47,13 @@ pub fn analysis_bench(
     path: &Path,
     what: BenchWhat,
     load_output_dirs: bool,
+    with_proc_macro: bool,
 ) -> Result<()> {
     ra_prof::init();
 
     let start = Instant::now();
     eprint!("loading: ");
-    let (mut host, roots) = load_cargo(path, load_output_dirs)?;
+    let (mut host, roots) = load_cargo(path, load_output_dirs, with_proc_macro)?;
     let db = host.raw_database();
     eprintln!("{:?}\n", start.elapsed());
 
diff --git a/crates/rust-analyzer/src/cli/analysis_stats.rs b/crates/rust-analyzer/src/cli/analysis_stats.rs
index e9ee0b888..d442cbd63 100644
--- a/crates/rust-analyzer/src/cli/analysis_stats.rs
+++ b/crates/rust-analyzer/src/cli/analysis_stats.rs
@@ -25,9 +25,10 @@ pub fn analysis_stats(
     with_deps: bool,
     randomize: bool,
     load_output_dirs: bool,
+    with_proc_macro: bool,
 ) -> Result<()> {
     let db_load_time = Instant::now();
-    let (mut host, roots) = load_cargo(path, load_output_dirs)?;
+    let (mut host, roots) = load_cargo(path, load_output_dirs, with_proc_macro)?;
     let db = host.raw_database();
     println!("Database loaded, {} roots, {:?}", roots.len(), db_load_time.elapsed());
     let analysis_time = Instant::now();
diff --git a/crates/rust-analyzer/src/cli/diagnostics.rs b/crates/rust-analyzer/src/cli/diagnostics.rs
new file mode 100644
index 000000000..60daefa3e
--- /dev/null
+++ b/crates/rust-analyzer/src/cli/diagnostics.rs
@@ -0,0 +1,79 @@
+//! Analyze all modules in a project for diagnostics. Exits with a non-zero status
+//! code if any errors are found.
+
+use anyhow::anyhow;
+use ra_db::SourceDatabaseExt;
+use ra_ide::Severity;
+use std::{collections::HashSet, path::Path};
+
+use crate::cli::{load_cargo::load_cargo, Result};
+use hir::Semantics;
+
+pub fn diagnostics(
+    path: &Path,
+    load_output_dirs: bool,
+    with_proc_macro: bool,
+    all: bool,
+) -> Result<()> {
+    let (host, roots) = load_cargo(path, load_output_dirs, with_proc_macro)?;
+    let db = host.raw_database();
+    let analysis = host.analysis();
+    let semantics = Semantics::new(db);
+    let members = roots
+        .into_iter()
+        .filter_map(|(source_root_id, project_root)| {
+            // filter out dependencies
+            if project_root.is_member() {
+                Some(source_root_id)
+            } else {
+                None
+            }
+        })
+        .collect::<HashSet<_>>();
+
+    let mut found_error = false;
+    let mut visited_files = HashSet::new();
+    for source_root_id in members {
+        for file_id in db.source_root(source_root_id).walk() {
+            // Filter out files which are not actually modules (unless `--all` flag is
+            // passed). In the rust-analyzer repository this filters out the parser test files.
+            if semantics.to_module_def(file_id).is_some() || all {
+                if !visited_files.contains(&file_id) {
+                    let crate_name = if let Some(module) = semantics.to_module_def(file_id) {
+                        if let Some(name) = module.krate().display_name(db) {
+                            format!("{}", name)
+                        } else {
+                            String::from("unknown")
+                        }
+                    } else {
+                        String::from("unknown")
+                    };
+                    println!(
+                        "processing crate: {}, module: {}",
+                        crate_name,
+                        db.file_relative_path(file_id)
+                    );
+                    for diagnostic in analysis.diagnostics(file_id).unwrap() {
+                        if matches!(diagnostic.severity, Severity::Error) {
+                            found_error = true;
+                        }
+
+                        println!("{:?}", diagnostic);
+                    }
+
+                    visited_files.insert(file_id);
+                }
+            }
+        }
+    }
+
+    println!();
+    println!("diagnostic scan complete");
+
+    if found_error {
+        println!();
+        Err(anyhow!("diagnostic error detected"))
+    } else {
+        Ok(())
+    }
+}
diff --git a/crates/rust-analyzer/src/cli/load_cargo.rs b/crates/rust-analyzer/src/cli/load_cargo.rs
index 43062ea10..eb9ac32c3 100644
--- a/crates/rust-analyzer/src/cli/load_cargo.rs
+++ b/crates/rust-analyzer/src/cli/load_cargo.rs
@@ -8,7 +8,7 @@ use crossbeam_channel::{unbounded, Receiver};
 use ra_db::{ExternSourceId, FileId, SourceRootId};
 use ra_ide::{AnalysisChange, AnalysisHost};
 use ra_project_model::{
-    get_rustc_cfg_options, CargoConfig, PackageRoot, ProcMacroClient, ProjectWorkspace,
+    get_rustc_cfg_options, CargoConfig, PackageRoot, ProcMacroClient, ProjectRoot, ProjectWorkspace,
 };
 use ra_vfs::{RootEntry, Vfs, VfsChange, VfsTask, Watch};
 use rustc_hash::{FxHashMap, FxHashSet};
@@ -25,11 +25,14 @@ fn vfs_root_to_id(r: ra_vfs::VfsRoot) -> SourceRootId {
 pub(crate) fn load_cargo(
     root: &Path,
     load_out_dirs_from_check: bool,
+    with_proc_macro: bool,
 ) -> Result<(AnalysisHost, FxHashMap<SourceRootId, PackageRoot>)> {
     let root = std::env::current_dir()?.join(root);
-    let ws = ProjectWorkspace::discover(
-        root.as_ref(),
+    let root = ProjectRoot::discover_single(&root)?;
+    let ws = ProjectWorkspace::load(
+        root,
         &CargoConfig { load_out_dirs_from_check, ..Default::default() },
+        true,
     )?;
 
     let mut extern_dirs = FxHashSet::default();
@@ -69,7 +72,14 @@ pub(crate) fn load_cargo(
         })
         .collect::<FxHashMap<_, _>>();
 
-    let proc_macro_client = ProcMacroClient::dummy();
+    let proc_macro_client = if !with_proc_macro {
+        ProcMacroClient::dummy()
+    } else {
+        let mut path = std::env::current_exe()?;
+        path.pop();
+        path.push("rust-analyzer");
+        ProcMacroClient::extern_process(&path, &["proc-macro"]).unwrap()
+    };
     let host = load(&source_roots, ws, &mut vfs, receiver, extern_dirs, &proc_macro_client);
     Ok((host, source_roots))
 }
@@ -175,7 +185,7 @@ mod tests {
     #[test]
     fn test_loading_rust_analyzer() {
         let path = Path::new(env!("CARGO_MANIFEST_DIR")).parent().unwrap().parent().unwrap();
-        let (host, _roots) = load_cargo(path, false).unwrap();
+        let (host, _roots) = load_cargo(path, false, false).unwrap();
         let n_crates = Crate::all(host.raw_database()).len();
         // RA has quite a few crates, but the exact count doesn't matter
         assert!(n_crates > 20);
diff --git a/crates/rust-analyzer/src/config.rs b/crates/rust-analyzer/src/config.rs
index 4734df16a..2b45f1310 100644
--- a/crates/rust-analyzer/src/config.rs
+++ b/crates/rust-analyzer/src/config.rs
@@ -20,7 +20,7 @@ pub struct Config {
     pub with_sysroot: bool,
     pub publish_diagnostics: bool,
     pub lru_capacity: Option<usize>,
-    pub proc_macro_srv: Option<String>,
+    pub proc_macro_srv: Option<(String, Vec<String>)>,
     pub files: FilesConfig,
     pub notifications: NotificationsConfig,
 
@@ -131,6 +131,18 @@ impl Config {
         set(value, "/cargo/allFeatures", &mut self.cargo.all_features);
         set(value, "/cargo/features", &mut self.cargo.features);
         set(value, "/cargo/loadOutDirsFromCheck", &mut self.cargo.load_out_dirs_from_check);
+
+        match get::<bool>(value, "/procMacro/enabled") {
+            Some(true) => {
+                if let Ok(mut path) = std::env::current_exe() {
+                    path.pop();
+                    path.push("rust-analyzer");
+                    self.proc_macro_srv = Some((path.to_string_lossy().to_string(), vec!["proc-macro".to_string()]));
+                }
+            }
+            _ => self.proc_macro_srv = None,
+        }
+
         match get::<Vec<String>>(value, "/rustfmt/overrideCommand") {
             Some(mut args) if !args.is_empty() => {
                 let command = args.remove(0);
diff --git a/crates/rust-analyzer/src/main_loop.rs b/crates/rust-analyzer/src/main_loop.rs
index 8d1429196..fc4c77f8a 100644
--- a/crates/rust-analyzer/src/main_loop.rs
+++ b/crates/rust-analyzer/src/main_loop.rs
@@ -15,6 +15,7 @@ use std::{
 };
 
 use crossbeam_channel::{never, select, unbounded, RecvError, Sender};
+use itertools::Itertools;
 use lsp_server::{Connection, ErrorCode, Message, Notification, Request, RequestId, Response};
 use lsp_types::{
     NumberOrString, WorkDoneProgress, WorkDoneProgressBegin, WorkDoneProgressCreateParams,
@@ -88,37 +89,46 @@ pub fn main_loop(ws_roots: Vec<PathBuf>, config: Config, connection: Connection)
 
     let mut loop_state = LoopState::default();
     let mut world_state = {
-        // FIXME: support dynamic workspace loading.
         let workspaces = {
-            let mut loaded_workspaces = Vec::new();
-            for ws_root in &ws_roots {
-                let workspace = ra_project_model::ProjectWorkspace::discover_with_sysroot(
-                    ws_root.as_path(),
-                    config.with_sysroot,
-                    &config.cargo,
-                );
-                match workspace {
-                    Ok(workspace) => loaded_workspaces.push(workspace),
-                    Err(e) => {
-                        log::error!("loading workspace failed: {:?}", e);
-
-                        if let Some(ra_project_model::CargoTomlNotFoundError { .. }) =
-                            e.downcast_ref()
-                        {
-                            if !config.notifications.cargo_toml_not_found {
-                                continue;
-                            }
-                        }
+            // FIXME: support dynamic workspace loading.
+            let mut visited = FxHashSet::default();
+            let project_roots = ws_roots
+                .iter()
+                .filter_map(|it| ra_project_model::ProjectRoot::discover(it).ok())
+                .flatten()
+                .filter(|it| visited.insert(it.clone()))
+                .collect::<Vec<_>>();
+
+            if project_roots.is_empty() && config.notifications.cargo_toml_not_found {
+                show_message(
+                        req::MessageType::Error,
+                        format!(
+                            "rust-analyzer failed to discover workspace, no Cargo.toml found, dirs searched: {}",
+                            ws_roots.iter().format_with(", ", |it, f| f(&it.display()))
+                        ),
+                        &connection.sender,
+                    );
+            };
 
+            project_roots
+                .into_iter()
+                .filter_map(|root| {
+                    ra_project_model::ProjectWorkspace::load(
+                        root,
+                        &config.cargo,
+                        config.with_sysroot,
+                    )
+                    .map_err(|err| {
+                        log::error!("failed to load workspace: {:#}", err);
                         show_message(
                             req::MessageType::Error,
-                            format!("rust-analyzer failed to load workspace: {:?}", e),
+                            format!("rust-analyzer failed to load workspace: {:#}", err),
                             &connection.sender,
                         );
-                    }
-                }
-            }
-            loaded_workspaces
+                    })
+                    .ok()
+                })
+                .collect::<Vec<_>>()
         };
 
         let globs = config
diff --git a/crates/rust-analyzer/src/world.rs b/crates/rust-analyzer/src/world.rs
index 6c42e1d76..f2ad453fa 100644
--- a/crates/rust-analyzer/src/world.rs
+++ b/crates/rust-analyzer/src/world.rs
@@ -64,6 +64,7 @@ pub struct WorldState {
     pub latest_requests: Arc<RwLock<LatestRequests>>,
     pub flycheck: Option<Flycheck>,
     pub diagnostics: DiagnosticCollection,
+    pub proc_macro_client: ProcMacroClient,
 }
 
 /// An immutable snapshot of the world's state at a point in time.
@@ -147,9 +148,9 @@ impl WorldState {
 
         let proc_macro_client = match &config.proc_macro_srv {
             None => ProcMacroClient::dummy(),
-            Some(srv) => {
-                let path = Path::new(&srv);
-                match ProcMacroClient::extern_process(path) {
+            Some((path, args)) => {
+                let path = std::path::Path::new(path);
+                match ProcMacroClient::extern_process(path, args) {
                     Ok(it) => it,
                     Err(err) => {
                         log::error!(
@@ -192,6 +193,7 @@ impl WorldState {
             latest_requests: Default::default(),
             flycheck,
             diagnostics: Default::default(),
+            proc_macro_client,
         }
     }
 
diff --git a/crates/rust-analyzer/tests/heavy_tests/main.rs b/crates/rust-analyzer/tests/heavy_tests/main.rs
index 638813311..1dd2676b6 100644
--- a/crates/rust-analyzer/tests/heavy_tests/main.rs
+++ b/crates/rust-analyzer/tests/heavy_tests/main.rs
@@ -9,7 +9,7 @@ use lsp_types::{
 };
 use rust_analyzer::req::{
     CodeActionParams, CodeActionRequest, Completion, CompletionParams, DidOpenTextDocument,
-    Formatting, GotoDefinition, OnEnter, Runnables, RunnablesParams,
+    Formatting, GotoDefinition, HoverRequest, OnEnter, Runnables, RunnablesParams,
 };
 use serde_json::json;
 use tempfile::TempDir;
@@ -625,3 +625,92 @@ fn main() { message(); }
     ));
     assert!(format!("{}", res).contains("hello.rs"));
 }
+
+#[test]
+fn resolve_proc_macro() {
+    if skip_slow_tests() {
+        return;
+    }
+    let server = Project::with_fixture(
+        r###"
+//- foo/Cargo.toml
+[package]
+name = "foo"
+version = "0.0.0"
+edition = "2018"
+[dependencies]
+bar = {path = "../bar"}
+
+//- foo/src/main.rs
+use bar::Bar;
+trait Bar {
+  fn bar();
+}
+#[derive(Bar)]
+struct Foo {}
+fn main() {
+  Foo::bar();
+}
+
+//- bar/Cargo.toml
+[package]
+name = "bar"
+version = "0.0.0"
+edition = "2018"
+
+[lib]
+proc-macro = true
+
+//- bar/src/lib.rs
+extern crate proc_macro;
+use proc_macro::{Delimiter, Group, Ident, Span, TokenStream, TokenTree};
+macro_rules! t {
+    ($n:literal) => {
+        TokenTree::from(Ident::new($n, Span::call_site()))
+    };
+    ({}) => {
+        TokenTree::from(Group::new(Delimiter::Brace, TokenStream::new()))
+    };
+    (()) => {
+        TokenTree::from(Group::new(Delimiter::Parenthesis, TokenStream::new()))
+    };
+}
+#[proc_macro_derive(Bar)]
+pub fn foo(_input: TokenStream) -> TokenStream {
+    // We hard code the output here for preventing to use any deps
+    let mut res = TokenStream::new();
+
+    // impl Bar for Foo { fn bar() {} }
+    let mut tokens = vec![t!("impl"), t!("Bar"), t!("for"), t!("Foo")];
+    let mut fn_stream = TokenStream::new();
+    fn_stream.extend(vec![t!("fn"), t!("bar"), t!(()), t!({})]);
+    tokens.push(Group::new(Delimiter::Brace, fn_stream).into());
+    res.extend(tokens);
+    res
+}
+
+"###,
+    )
+    .with_config(|config| {
+        // FIXME: Use env!("CARGO_BIN_EXE_ra-analyzer") instead after
+        // https://github.com/rust-lang/cargo/pull/7697 landed
+        let macro_srv_path = std::path::Path::new(std::env!("CARGO_MANIFEST_DIR"))
+            .join("../../target/debug/rust-analyzer")
+            .to_string_lossy()
+            .to_string();
+
+        config.cargo.load_out_dirs_from_check = true;
+        config.proc_macro_srv = Some((macro_srv_path, vec!["proc-macro".to_string()]));
+    })
+    .root("foo")
+    .root("bar")
+    .server();
+    server.wait_until_workspace_is_loaded();
+    let res = server.send_request::<HoverRequest>(TextDocumentPositionParams::new(
+        server.doc_id("foo/src/main.rs"),
+        Position::new(7, 9),
+    ));
+
+    let value = res.get("contents").unwrap().get("value").unwrap().to_string();
+    assert_eq!(value, r#""```rust\nfoo::Bar\nfn bar()\n```""#)
+}