33 files changed, 332 insertions, 329 deletions

diff --git a/crates/hir/src/code_model.rs b/crates/hir/src/code_model.rs
index 00b0dc082..fc1a74641 100644
--- a/crates/hir/src/code_model.rs
+++ b/crates/hir/src/code_model.rs
@@ -14,7 +14,7 @@ use hir_def::{
     per_ns::PerNs,
     resolver::{HasResolver, Resolver},
     src::HasSource as _,
-    type_ref::{Mutability, TypeRef},
+    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,
@@ -32,8 +32,8 @@ use hir_ty::{
     method_resolution,
     traits::{FnTrait, Solution, SolutionVariables},
     AliasTy, BoundVar, CallableDefId, CallableSig, Canonical, DebruijnIndex, GenericPredicate,
-    InEnvironment, Obligation, ProjectionPredicate, ProjectionTy, Scalar, Substs, TraitEnvironment,
-    Ty, TyDefId, TyVariableKind,
+    InEnvironment, Mutability, Obligation, ProjectionPredicate, ProjectionTy, Scalar, Substs,
+    TraitEnvironment, Ty, TyDefId, TyVariableKind,
 };
 use rustc_hash::FxHashSet;
 use stdx::{format_to, impl_from};
@@ -836,7 +836,7 @@ pub enum Access {
 impl From<Mutability> for Access {
     fn from(mutability: Mutability) -> Access {
         match mutability {
-            Mutability::Shared => Access::Shared,
+            Mutability::Not => Access::Shared,
             Mutability::Mut => Access::Exclusive,
         }
     }
@@ -865,7 +865,10 @@ impl SelfParam {
             .params
             .first()
             .map(|param| match *param {
-                TypeRef::Reference(.., mutability) => mutability.into(),
+                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)
diff --git a/crates/hir_def/src/find_path.rs b/crates/hir_def/src/find_path.rs
index 5e2a711b8..3e19a7702 100644
--- a/crates/hir_def/src/find_path.rs
+++ b/crates/hir_def/src/find_path.rs
@@ -1,5 +1,7 @@
 //! An algorithm to find a path to refer to a certain item.
 
+use std::iter;
+
 use hir_expand::name::{known, AsName, Name};
 use rustc_hash::FxHashSet;
 use test_utils::mark;
@@ -95,7 +97,7 @@ fn find_path_inner(
     item: ItemInNs,
     from: ModuleId,
     max_len: usize,
-    prefixed: Option<PrefixKind>,
+    mut prefixed: Option<PrefixKind>,
 ) -> Option<ModPath> {
     if max_len == 0 {
         return None;
@@ -114,8 +116,9 @@ fn find_path_inner(
     }
 
     // - if the item is the crate root, return `crate`
-    let root = def_map.module_id(def_map.root());
+    let root = def_map.crate_root(db);
     if item == ItemInNs::Types(ModuleDefId::ModuleId(root)) && def_map.block_id().is_none() {
+        // FIXME: the `block_id()` check should be unnecessary, but affects the result
         return Some(ModPath::from_segments(PathKind::Crate, Vec::new()));
     }
 
@@ -165,7 +168,7 @@ fn find_path_inner(
 
     // - otherwise, look for modules containing (reexporting) it and import it from one of those
 
-    let crate_root = def_map.module_id(def_map.root());
+    let crate_root = def_map.crate_root(db);
     let crate_attrs = db.attrs(crate_root.into());
     let prefer_no_std = crate_attrs.by_key("no_std").exists();
     let mut best_path = None;
@@ -228,12 +231,16 @@ fn find_path_inner(
         }
     }
 
-    if let Some(mut prefix) = prefixed.map(PrefixKind::prefix) {
-        if matches!(prefix, PathKind::Crate | PathKind::Super(0)) && def_map.block_id().is_some() {
-            // Inner items cannot be referred to via `crate::` or `self::` paths.
-            prefix = PathKind::Plain;
+    // If the item is declared inside a block expression, don't use a prefix, as we don't handle
+    // that correctly (FIXME).
+    if let Some(item_module) = item.as_module_def_id().and_then(|did| did.module(db)) {
+        if item_module.def_map(db).block_id().is_some() && prefixed.is_some() {
+            mark::hit!(prefixed_in_block_expression);
+            prefixed = Some(PrefixKind::Plain);
         }
+    }
 
+    if let Some(prefix) = prefixed.map(PrefixKind::prefix) {
         best_path.or_else(|| {
             scope_name.map(|scope_name| ModPath::from_segments(prefix, vec![scope_name]))
         })
@@ -285,12 +292,12 @@ fn find_local_import_locations(
     let data = &def_map[from.local_id];
     let mut worklist =
         data.children.values().map(|child| def_map.module_id(*child)).collect::<Vec<_>>();
-    let mut parent = data.parent;
-    while let Some(p) = parent {
-        worklist.push(def_map.module_id(p));
-        parent = def_map[p].parent;
+    for ancestor in iter::successors(from.containing_module(db), |m| m.containing_module(db)) {
+        worklist.push(ancestor);
     }
 
+    let def_map = def_map.crate_root(db).def_map(db);
+
     let mut seen: FxHashSet<_> = FxHashSet::default();
 
     let mut locations = Vec::new();
@@ -301,7 +308,14 @@ fn find_local_import_locations(
 
         let ext_def_map;
         let data = if module.krate == from.krate {
-            &def_map[module.local_id]
+            if module.block.is_some() {
+                // Re-query the block's DefMap
+                ext_def_map = module.def_map(db);
+                &ext_def_map[module.local_id]
+            } else {
+                // Reuse the root DefMap
+                &def_map[module.local_id]
+            }
         } else {
             // The crate might reexport a module defined in another crate.
             ext_def_map = module.def_map(db);
@@ -828,6 +842,7 @@ mod tests {
 
     #[test]
     fn inner_items_from_inner_module() {
+        mark::check!(prefixed_in_block_expression);
         check_found_path(
             r#"
             fn main() {
@@ -869,4 +884,24 @@ mod tests {
             "super::Struct",
         );
     }
+
+    #[test]
+    fn outer_items_with_inner_items_present() {
+        check_found_path(
+            r#"
+            mod module {
+                pub struct CompleteMe;
+            }
+
+            fn main() {
+                fn inner() {}
+                $0
+            }
+            "#,
+            "module::CompleteMe",
+            "module::CompleteMe",
+            "crate::module::CompleteMe",
+            "self::module::CompleteMe",
+        )
+    }
 }
diff --git a/crates/hir_def/src/item_scope.rs b/crates/hir_def/src/item_scope.rs
index ee46c3330..4e5daa2ff 100644
--- a/crates/hir_def/src/item_scope.rs
+++ b/crates/hir_def/src/item_scope.rs
@@ -12,8 +12,8 @@ use stdx::format_to;
 use test_utils::mark;
 
 use crate::{
-    db::DefDatabase, per_ns::PerNs, visibility::Visibility, AdtId, BuiltinType, HasModule, ImplId,
-    LocalModuleId, Lookup, MacroDefId, ModuleDefId, ModuleId, TraitId,
+    db::DefDatabase, per_ns::PerNs, visibility::Visibility, AdtId, BuiltinType, ImplId,
+    LocalModuleId, MacroDefId, ModuleDefId, ModuleId, TraitId,
 };
 
 #[derive(Copy, Clone)]
@@ -375,19 +375,9 @@ impl ItemInNs {
 
     /// Returns the crate defining this item (or `None` if `self` is built-in).
     pub fn krate(&self, db: &dyn DefDatabase) -> Option<CrateId> {
-        Some(match self {
-            ItemInNs::Types(did) | ItemInNs::Values(did) => match did {
-                ModuleDefId::ModuleId(id) => id.krate,
-                ModuleDefId::FunctionId(id) => id.lookup(db).module(db).krate,
-                ModuleDefId::AdtId(id) => id.module(db).krate,
-                ModuleDefId::EnumVariantId(id) => id.parent.lookup(db).container.module(db).krate,
-                ModuleDefId::ConstId(id) => id.lookup(db).container.module(db).krate,
-                ModuleDefId::StaticId(id) => id.lookup(db).container.module(db).krate,
-                ModuleDefId::TraitId(id) => id.lookup(db).container.module(db).krate,
-                ModuleDefId::TypeAliasId(id) => id.lookup(db).module(db).krate,
-                ModuleDefId::BuiltinType(_) => return None,
-            },
-            ItemInNs::Macros(id) => return Some(id.krate),
-        })
+        match self {
+            ItemInNs::Types(did) | ItemInNs::Values(did) => did.module(db).map(|m| m.krate),
+            ItemInNs::Macros(id) => Some(id.krate),
+        }
     }
 }
diff --git a/crates/hir_def/src/lib.rs b/crates/hir_def/src/lib.rs
index 6802bc250..4498d94bb 100644
--- a/crates/hir_def/src/lib.rs
+++ b/crates/hir_def/src/lib.rs
@@ -97,6 +97,10 @@ impl ModuleId {
     pub fn krate(&self) -> CrateId {
         self.krate
     }
+
+    pub fn containing_module(&self, db: &dyn db::DefDatabase) -> Option<ModuleId> {
+        self.def_map(db).containing_module(self.local_id)
+    }
 }
 
 /// An ID of a module, **local** to a specific crate
@@ -529,6 +533,25 @@ impl HasModule for StaticLoc {
     }
 }
 
+impl ModuleDefId {
+    /// Returns the module containing `self` (or `self`, if `self` is itself a module).
+    ///
+    /// Returns `None` if `self` refers to a primitive type.
+    pub fn module(&self, db: &dyn db::DefDatabase) -> Option<ModuleId> {
+        Some(match self {
+            ModuleDefId::ModuleId(id) => *id,
+            ModuleDefId::FunctionId(id) => id.lookup(db).module(db),
+            ModuleDefId::AdtId(id) => id.module(db),
+            ModuleDefId::EnumVariantId(id) => id.parent.lookup(db).container.module(db),
+            ModuleDefId::ConstId(id) => id.lookup(db).container.module(db),
+            ModuleDefId::StaticId(id) => id.lookup(db).container.module(db),
+            ModuleDefId::TraitId(id) => id.lookup(db).container.module(db),
+            ModuleDefId::TypeAliasId(id) => id.lookup(db).module(db),
+            ModuleDefId::BuiltinType(_) => return None,
+        })
+    }
+}
+
 impl AttrDefId {
     pub fn krate(&self, db: &dyn db::DefDatabase) -> CrateId {
         match self {
diff --git a/crates/hir_def/src/nameres.rs b/crates/hir_def/src/nameres.rs
index 6a3456f2e..003d668ca 100644
--- a/crates/hir_def/src/nameres.rs
+++ b/crates/hir_def/src/nameres.rs
@@ -343,6 +343,18 @@ impl DefMap {
         Some(self.block?.parent)
     }
 
+    /// Returns the module containing `local_mod`, either the parent `mod`, or the module containing
+    /// the block, if `self` corresponds to a block expression.
+    pub fn containing_module(&self, local_mod: LocalModuleId) -> Option<ModuleId> {
+        match &self[local_mod].parent {
+            Some(parent) => Some(self.module_id(*parent)),
+            None => match &self.block {
+                Some(block) => Some(block.parent),
+                None => None,
+            },
+        }
+    }
+
     // FIXME: this can use some more human-readable format (ideally, an IR
     // even), as this should be a great debugging aid.
     pub fn dump(&self, db: &dyn DefDatabase) -> String {
diff --git a/crates/hir_ty/src/display.rs b/crates/hir_ty/src/display.rs
index f3a4333cb..d4a8b48e6 100644
--- a/crates/hir_ty/src/display.rs
+++ b/crates/hir_ty/src/display.rs
@@ -8,6 +8,7 @@ use crate::{
     TraitRef, Ty,
 };
 use arrayvec::ArrayVec;
+use chalk_ir::Mutability;
 use hir_def::{
     db::DefDatabase, find_path, generics::TypeParamProvenance, item_scope::ItemInNs, AdtId,
     AssocContainerId, HasModule, Lookup, ModuleId, TraitId,
@@ -291,9 +292,23 @@ impl HirDisplay for Ty {
                     t.into_displayable(f.db, f.max_size, f.omit_verbose_types, f.display_target);
 
                 if matches!(self, Ty::Raw(..)) {
-                    write!(f, "*{}", m.as_keyword_for_ptr())?;
+                    write!(
+                        f,
+                        "*{}",
+                        match m {
+                            Mutability::Not => "const ",
+                            Mutability::Mut => "mut ",
+                        }
+                    )?;
                 } else {
-                    write!(f, "&{}", m.as_keyword_for_ref())?;
+                    write!(
+                        f,
+                        "&{}",
+                        match m {
+                            Mutability::Not => "",
+                            Mutability::Mut => "mut ",
+                        }
+                    )?;
                 }
 
                 let datas;
diff --git a/crates/hir_ty/src/infer.rs b/crates/hir_ty/src/infer.rs
index 18a4f5e8a..4d771a91e 100644
--- a/crates/hir_ty/src/infer.rs
+++ b/crates/hir_ty/src/infer.rs
@@ -18,6 +18,7 @@ use std::mem;
 use std::ops::Index;
 use std::sync::Arc;
 
+use chalk_ir::Mutability;
 use hir_def::{
     body::Body,
     data::{ConstData, FunctionData, StaticData},
@@ -25,7 +26,7 @@ use hir_def::{
     lang_item::LangItemTarget,
     path::{path, Path},
     resolver::{HasResolver, Resolver, TypeNs},
-    type_ref::{Mutability, TypeRef},
+    type_ref::TypeRef,
     AdtId, AssocItemId, DefWithBodyId, EnumVariantId, FieldId, FunctionId, Lookup, TraitId,
     TypeAliasId, VariantId,
 };
@@ -87,7 +88,7 @@ impl BindingMode {
     fn convert(annotation: BindingAnnotation) -> BindingMode {
         match annotation {
             BindingAnnotation::Unannotated | BindingAnnotation::Mutable => BindingMode::Move,
-            BindingAnnotation::Ref => BindingMode::Ref(Mutability::Shared),
+            BindingAnnotation::Ref => BindingMode::Ref(Mutability::Not),
             BindingAnnotation::RefMut => BindingMode::Ref(Mutability::Mut),
         }
     }
diff --git a/crates/hir_ty/src/infer/coerce.rs b/crates/hir_ty/src/infer/coerce.rs
index c33d8c61e..cf0a3add4 100644
--- a/crates/hir_ty/src/infer/coerce.rs
+++ b/crates/hir_ty/src/infer/coerce.rs
@@ -4,8 +4,8 @@
 //!
 //! See: https://doc.rust-lang.org/nomicon/coercions.html
 
-use chalk_ir::TyVariableKind;
-use hir_def::{lang_item::LangItemTarget, type_ref::Mutability};
+use chalk_ir::{Mutability, TyVariableKind};
+use hir_def::lang_item::LangItemTarget;
 use test_utils::mark;
 
 use crate::{autoderef, traits::Solution, Obligation, Substs, TraitRef, Ty};
@@ -73,20 +73,20 @@ impl<'a> InferenceContext<'a> {
         match (&mut from_ty, to_ty) {
             // `*mut T` -> `*const T`
             // `&mut T` -> `&T`
-            (Ty::Raw(m1, ..), Ty::Raw(m2 @ Mutability::Shared, ..))
-            | (Ty::Ref(m1, ..), Ty::Ref(m2 @ Mutability::Shared, ..)) => {
+            (Ty::Raw(m1, ..), Ty::Raw(m2 @ Mutability::Not, ..))
+            | (Ty::Ref(m1, ..), Ty::Ref(m2 @ Mutability::Not, ..)) => {
                 *m1 = *m2;
             }
             // `&T` -> `*const T`
             // `&mut T` -> `*mut T`/`*const T`
-            (Ty::Ref(.., substs), &Ty::Raw(m2 @ Mutability::Shared, ..))
+            (Ty::Ref(.., substs), &Ty::Raw(m2 @ Mutability::Not, ..))
             | (Ty::Ref(Mutability::Mut, substs), &Ty::Raw(m2, ..)) => {
                 from_ty = Ty::Raw(m2, substs.clone());
             }
 
             // Illegal mutability conversion
-            (Ty::Raw(Mutability::Shared, ..), Ty::Raw(Mutability::Mut, ..))
-            | (Ty::Ref(Mutability::Shared, ..), Ty::Ref(Mutability::Mut, ..)) => return false,
+            (Ty::Raw(Mutability::Not, ..), Ty::Raw(Mutability::Mut, ..))
+            | (Ty::Ref(Mutability::Not, ..), Ty::Ref(Mutability::Mut, ..)) => return false,
 
             // `{function_type}` -> `fn()`
             (Ty::FnDef(..), Ty::Function { .. }) => match from_ty.callable_sig(self.db) {
diff --git a/crates/hir_ty/src/infer/expr.rs b/crates/hir_ty/src/infer/expr.rs
index 7852b3d23..cf1f1038a 100644
--- a/crates/hir_ty/src/infer/expr.rs
+++ b/crates/hir_ty/src/infer/expr.rs
@@ -3,7 +3,7 @@
 use std::iter::{repeat, repeat_with};
 use std::{mem, sync::Arc};
 
-use chalk_ir::TyVariableKind;
+use chalk_ir::{Mutability, TyVariableKind};
 use hir_def::{
     expr::{Array, BinaryOp, Expr, ExprId, Literal, Statement, UnaryOp},
     path::{GenericArg, GenericArgs},
@@ -15,12 +15,14 @@ use syntax::ast::RangeOp;
 use test_utils::mark;
 
 use crate::{
-    autoderef, method_resolution, op,
+    autoderef,
+    lower::lower_to_chalk_mutability,
+    method_resolution, op,
     primitive::{self, UintTy},
     traits::{FnTrait, InEnvironment},
     utils::{generics, variant_data, Generics},
-    Binders, CallableDefId, FnPointer, FnSig, Mutability, Obligation, OpaqueTyId, Rawness, Scalar,
-    Substs, TraitRef, Ty,
+    Binders, CallableDefId, FnPointer, FnSig, Obligation, OpaqueTyId, Rawness, Scalar, Substs,
+    TraitRef, Ty,
 };
 
 use super::{
@@ -462,10 +464,11 @@ impl<'a> InferenceContext<'a> {
                 cast_ty
             }
             Expr::Ref { expr, rawness, mutability } => {
+                let mutability = lower_to_chalk_mutability(*mutability);
                 let expectation = if let Some((exp_inner, exp_rawness, exp_mutability)) =
                     &expected.ty.as_reference_or_ptr()
                 {
-                    if *exp_mutability == Mutability::Mut && *mutability == Mutability::Shared {
+                    if *exp_mutability == Mutability::Mut && mutability == Mutability::Not {
                         // FIXME: throw type error - expected mut reference but found shared ref,
                         // which cannot be coerced
                     }
@@ -479,8 +482,8 @@ impl<'a> InferenceContext<'a> {
                 };
                 let inner_ty = self.infer_expr_inner(*expr, &expectation);
                 match rawness {
-                    Rawness::RawPtr => Ty::Raw(*mutability, Substs::single(inner_ty)),
-                    Rawness::Ref => Ty::Ref(*mutability, Substs::single(inner_ty)),
+                    Rawness::RawPtr => Ty::Raw(mutability, Substs::single(inner_ty)),
+                    Rawness::Ref => Ty::Ref(mutability, Substs::single(inner_ty)),
                 }
             }
             Expr::Box { expr } => {
@@ -684,11 +687,11 @@ impl<'a> InferenceContext<'a> {
             }
             Expr::Literal(lit) => match lit {
                 Literal::Bool(..) => Ty::Scalar(Scalar::Bool),
-                Literal::String(..) => Ty::Ref(Mutability::Shared, Substs::single(Ty::Str)),
+                Literal::String(..) => Ty::Ref(Mutability::Not, Substs::single(Ty::Str)),
                 Literal::ByteString(..) => {
                     let byte_type = Ty::Scalar(Scalar::Uint(UintTy::U8));
                     let array_type = Ty::Array(Substs::single(byte_type));
-                    Ty::Ref(Mutability::Shared, Substs::single(array_type))
+                    Ty::Ref(Mutability::Not, Substs::single(array_type))
                 }
                 Literal::Char(..) => Ty::Scalar(Scalar::Char),
                 Literal::Int(_v, ty) => match ty {
diff --git a/crates/hir_ty/src/infer/pat.rs b/crates/hir_ty/src/infer/pat.rs
index a318e47f3..eb099311c 100644
--- a/crates/hir_ty/src/infer/pat.rs
+++ b/crates/hir_ty/src/infer/pat.rs
@@ -3,17 +3,17 @@
 use std::iter::repeat;
 use std::sync::Arc;
 
+use chalk_ir::Mutability;
 use hir_def::{
     expr::{BindingAnnotation, Expr, Literal, Pat, PatId, RecordFieldPat},
     path::Path,
-    type_ref::Mutability,
     FieldId,
 };
 use hir_expand::name::Name;
 use test_utils::mark;
 
 use super::{BindingMode, Expectation, InferenceContext};
-use crate::{utils::variant_data, Substs, Ty};
+use crate::{lower::lower_to_chalk_mutability, utils::variant_data, Substs, Ty};
 
 impl<'a> InferenceContext<'a> {
     fn infer_tuple_struct_pat(
@@ -103,7 +103,7 @@ impl<'a> InferenceContext<'a> {
                 expected = inner;
                 default_bm = match default_bm {
                     BindingMode::Move => BindingMode::Ref(mutability),
-                    BindingMode::Ref(Mutability::Shared) => BindingMode::Ref(Mutability::Shared),
+                    BindingMode::Ref(Mutability::Not) => BindingMode::Ref(Mutability::Not),
                     BindingMode::Ref(Mutability::Mut) => BindingMode::Ref(mutability),
                 }
             }
@@ -152,9 +152,10 @@ impl<'a> InferenceContext<'a> {
                 }
             }
             Pat::Ref { pat, mutability } => {
+                let mutability = lower_to_chalk_mutability(*mutability);
                 let expectation = match expected.as_reference() {
                     Some((inner_ty, exp_mut)) => {
-                        if *mutability != exp_mut {
+                        if mutability != exp_mut {
                             // FIXME: emit type error?
                         }
                         inner_ty
@@ -162,7 +163,7 @@ impl<'a> InferenceContext<'a> {
                     _ => &Ty::Unknown,
                 };
                 let subty = self.infer_pat(*pat, expectation, default_bm);
-                Ty::Ref(*mutability, Substs::single(subty))
+                Ty::Ref(mutability, Substs::single(subty))
             }
             Pat::TupleStruct { path: p, args: subpats, ellipsis } => self.infer_tuple_struct_pat(
                 p.as_ref(),
diff --git a/crates/hir_ty/src/lib.rs b/crates/hir_ty/src/lib.rs
index 9bcaf6fa7..c2a20c480 100644
--- a/crates/hir_ty/src/lib.rs
+++ b/crates/hir_ty/src/lib.rs
@@ -27,11 +27,9 @@ use std::{iter, mem, ops::Deref, sync::Arc};
 
 use base_db::salsa;
 use hir_def::{
-    builtin_type::BuiltinType,
-    expr::ExprId,
-    type_ref::{Mutability, Rawness},
-    AdtId, AssocContainerId, DefWithBodyId, FunctionId, GenericDefId, HasModule, LifetimeParamId,
-    Lookup, TraitId, TypeAliasId, TypeParamId,
+    builtin_type::BuiltinType, expr::ExprId, type_ref::Rawness, AdtId, AssocContainerId,
+    DefWithBodyId, FunctionId, GenericDefId, HasModule, LifetimeParamId, Lookup, TraitId,
+    TypeAliasId, TypeParamId,
 };
 use itertools::Itertools;
 
@@ -49,7 +47,7 @@ pub use lower::{
 };
 pub use traits::{InEnvironment, Obligation, ProjectionPredicate, TraitEnvironment};
 
-pub use chalk_ir::{BoundVar, DebruijnIndex, Scalar, TyVariableKind};
+pub use chalk_ir::{BoundVar, DebruijnIndex, Mutability, Scalar, TyVariableKind};
 
 #[derive(Clone, PartialEq, Eq, Debug, Hash)]
 pub enum Lifetime {
diff --git a/crates/hir_ty/src/lower.rs b/crates/hir_ty/src/lower.rs
index ca06c9fe2..1b5843d48 100644
--- a/crates/hir_ty/src/lower.rs
+++ b/crates/hir_ty/src/lower.rs
@@ -8,6 +8,7 @@
 use std::{iter, sync::Arc};
 
 use base_db::CrateId;
+use chalk_ir::Mutability;
 use hir_def::{
     adt::StructKind,
     builtin_type::BuiltinType,
@@ -157,7 +158,7 @@ impl Ty {
             }
             TypeRef::RawPtr(inner, mutability) => {
                 let inner_ty = Ty::from_hir(ctx, inner);
-                Ty::Raw(*mutability, Substs::single(inner_ty))
+                Ty::Raw(lower_to_chalk_mutability(*mutability), Substs::single(inner_ty))
             }
             TypeRef::Array(inner) => {
                 let inner_ty = Ty::from_hir(ctx, inner);
@@ -169,7 +170,7 @@ impl Ty {
             }
             TypeRef::Reference(inner, _, mutability) => {
                 let inner_ty = Ty::from_hir(ctx, inner);
-                Ty::Ref(*mutability, Substs::single(inner_ty))
+                Ty::Ref(lower_to_chalk_mutability(*mutability), Substs::single(inner_ty))
             }
             TypeRef::Placeholder => Ty::Unknown,
             TypeRef::Fn(params, is_varargs) => {
@@ -1259,3 +1260,10 @@ pub(crate) fn return_type_impl_traits(
         Some(Arc::new(Binders::new(num_binders, return_type_impl_traits)))
     }
 }
+
+pub(crate) fn lower_to_chalk_mutability(m: hir_def::type_ref::Mutability) -> Mutability {
+    match m {
+        hir_def::type_ref::Mutability::Shared => Mutability::Not,
+        hir_def::type_ref::Mutability::Mut => Mutability::Mut,
+    }
+}
diff --git a/crates/hir_ty/src/method_resolution.rs b/crates/hir_ty/src/method_resolution.rs
index dd5109d4e..f301a8477 100644
--- a/crates/hir_ty/src/method_resolution.rs
+++ b/crates/hir_ty/src/method_resolution.rs
@@ -6,9 +6,10 @@ use std::{iter, sync::Arc};
 
 use arrayvec::ArrayVec;
 use base_db::CrateId;
+use chalk_ir::Mutability;
 use hir_def::{
-    lang_item::LangItemTarget, type_ref::Mutability, AdtId, AssocContainerId, AssocItemId,
-    FunctionId, GenericDefId, HasModule, ImplId, Lookup, ModuleId, TraitId, TypeAliasId,
+    lang_item::LangItemTarget, AdtId, AssocContainerId, AssocItemId, FunctionId, GenericDefId,
+    HasModule, ImplId, Lookup, ModuleId, TraitId, TypeAliasId,
 };
 use hir_expand::name::Name;
 use rustc_hash::{FxHashMap, FxHashSet};
@@ -251,7 +252,7 @@ impl Ty {
             }
             Ty::Str => lang_item_crate!("str_alloc", "str"),
             Ty::Slice(_) => lang_item_crate!("slice_alloc", "slice"),
-            Ty::Raw(Mutability::Shared, _) => lang_item_crate!("const_ptr"),
+            Ty::Raw(Mutability::Not, _) => lang_item_crate!("const_ptr"),
             Ty::Raw(Mutability::Mut, _) => lang_item_crate!("mut_ptr"),
             Ty::Dyn(_) => {
                 return self.dyn_trait().and_then(|trait_| {
@@ -429,7 +430,7 @@ fn iterate_method_candidates_with_autoref(
     }
     let refed = Canonical {
         kinds: deref_chain[0].kinds.clone(),
-        value: Ty::Ref(Mutability::Shared, Substs::single(deref_chain[0].value.clone())),
+        value: Ty::Ref(Mutability::Not, Substs::single(deref_chain[0].value.clone())),
     };
     if iterate_method_candidates_by_receiver(
         &refed,
diff --git a/crates/hir_ty/src/traits/chalk/mapping.rs b/crates/hir_ty/src/traits/chalk/mapping.rs
index 6e6055d80..db1760e6c 100644
--- a/crates/hir_ty/src/traits/chalk/mapping.rs
+++ b/crates/hir_ty/src/traits/chalk/mapping.rs
@@ -10,7 +10,7 @@ use chalk_ir::{
 use chalk_solve::rust_ir;
 
 use base_db::salsa::InternKey;
-use hir_def::{type_ref::Mutability, AssocContainerId, GenericDefId, Lookup, TypeAliasId};
+use hir_def::{AssocContainerId, GenericDefId, Lookup, TypeAliasId};
 
 use crate::{
     db::HirDatabase,
@@ -65,7 +65,7 @@ impl ToChalk for Ty {
             }
             Ty::Raw(mutability, substs) => {
                 let ty = substs[0].clone().to_chalk(db);
-                chalk_ir::TyKind::Raw(mutability.to_chalk(db), ty).intern(&Interner)
+                chalk_ir::TyKind::Raw(mutability, ty).intern(&Interner)
             }
             Ty::Slice(substs) => {
                 chalk_ir::TyKind::Slice(substs[0].clone().to_chalk(db)).intern(&Interner)
@@ -198,11 +198,11 @@ impl ToChalk for Ty {
                 Ty::Tuple(cardinality, from_chalk(db, subst))
             }
             chalk_ir::TyKind::Raw(mutability, ty) => {
-                Ty::Raw(from_chalk(db, mutability), Substs::single(from_chalk(db, ty)))
+                Ty::Raw(mutability, Substs::single(from_chalk(db, ty)))
             }
             chalk_ir::TyKind::Slice(ty) => Ty::Slice(Substs::single(from_chalk(db, ty))),
             chalk_ir::TyKind::Ref(mutability, _lifetime, ty) => {
-                Ty::Ref(from_chalk(db, mutability), Substs::single(from_chalk(db, ty)))
+                Ty::Ref(mutability, Substs::single(from_chalk(db, ty)))
             }
             chalk_ir::TyKind::Str => Ty::Str,
             chalk_ir::TyKind::Never => Ty::Never,
@@ -230,12 +230,12 @@ impl ToChalk for Ty {
 /// fake lifetime here, because Chalks built-in logic may expect it to be there.
 fn ref_to_chalk(
     db: &dyn HirDatabase,
-    mutability: Mutability,
+    mutability: chalk_ir::Mutability,
     subst: Substs,
 ) -> chalk_ir::Ty<Interner> {
     let arg = subst[0].clone().to_chalk(db);
     let lifetime = LifetimeData::Static.intern(&Interner);
-    chalk_ir::TyKind::Ref(mutability.to_chalk(db), lifetime, arg).intern(&Interner)
+    chalk_ir::TyKind::Ref(mutability, lifetime, arg).intern(&Interner)
 }
 
 /// We currently don't model constants, but Chalk does. So, we have to insert a
@@ -313,22 +313,6 @@ impl ToChalk for OpaqueTyId {
     }
 }
 
-impl ToChalk for Mutability {
-    type Chalk = chalk_ir::Mutability;
-    fn to_chalk(self, _db: &dyn HirDatabase) -> Self::Chalk {
-        match self {
-            Mutability::Shared => chalk_ir::Mutability::Not,
-            Mutability::Mut => chalk_ir::Mutability::Mut,
-        }
-    }
-    fn from_chalk(_db: &dyn HirDatabase, chalk: Self::Chalk) -> Self {
-        match chalk {
-            chalk_ir::Mutability::Mut => Mutability::Mut,
-            chalk_ir::Mutability::Not => Mutability::Shared,
-        }
-    }
-}
-
 impl ToChalk for hir_def::ImplId {
     type Chalk = ImplId;
 
diff --git a/crates/mbe/Cargo.toml b/crates/mbe/Cargo.toml
index bbee2e32c..8b5cca22c 100644
--- a/crates/mbe/Cargo.toml
+++ b/crates/mbe/Cargo.toml
@@ -19,8 +19,5 @@ parser = { path = "../parser", version = "0.0.0" }
 tt = { path = "../tt", version = "0.0.0" }
 test_utils = { path = "../test_utils", version = "0.0.0" }
 
-# FIXME: Paper over a bug in cargo-worspaces which block publishing
-# https://github.com/pksunkara/cargo-workspaces/issues/39
-# [dev-dependencies]
-profile = { path = "../profile", version = "0.0.0" }
-
+[dev-dependencies]
+profile = { path = "../profile" }
diff --git a/docs/dev/README.md b/docs/dev/README.md
index d6fae5295..b91013f13 100644
--- a/docs/dev/README.md
+++ b/docs/dev/README.md
@@ -58,8 +58,6 @@ Use `env RUN_SLOW_TESTS=1 cargo test` to run the full suite.
 
 We use bors-ng to enforce the [not rocket science](https://graydon2.dreamwidth.org/1597.html) rule.
 
-You can run `cargo xtask install-pre-commit-hook` to install git-hook to run rustfmt on commit.
-
 # Launching rust-analyzer
 
 Debugging the language server can be tricky.
diff --git a/xtask/Cargo.toml b/xtask/Cargo.toml
index b379797f9..0455dd2eb 100644
--- a/xtask/Cargo.toml
+++ b/xtask/Cargo.toml
@@ -6,9 +6,6 @@ authors = ["rust-analyzer developers"]
 publish = false
 license = "MIT OR Apache-2.0"
 
-[lib]
-doctest = false
-
 [dependencies]
 anyhow = "1.0.26"
 flate2 = "1.0"
diff --git a/xtask/src/codegen.rs b/xtask/src/codegen.rs
index adea053b6..743e83e76 100644
--- a/xtask/src/codegen.rs
+++ b/xtask/src/codegen.rs
@@ -20,7 +20,7 @@ use xshell::{cmd, pushenv, read_file, write_file};
 
 use crate::{ensure_rustfmt, project_root, Result};
 
-pub use self::{
+pub(crate) use self::{
     gen_assists_docs::{generate_assists_docs, generate_assists_tests},
     gen_diagnostic_docs::generate_diagnostic_docs,
     gen_feature_docs::generate_feature_docs,
@@ -30,17 +30,17 @@ pub use self::{
 };
 
 #[derive(Debug, PartialEq, Eq, Clone, Copy)]
-pub enum Mode {
+pub(crate) enum Mode {
     Overwrite,
     Verify,
 }
 
-pub struct CodegenCmd {
-    pub features: bool,
+pub(crate) struct CodegenCmd {
+    pub(crate) features: bool,
 }
 
 impl CodegenCmd {
-    pub fn run(self) -> Result<()> {
+    pub(crate) fn run(self) -> Result<()> {
         if self.features {
             generate_lint_completions(Mode::Overwrite)?;
         }
diff --git a/xtask/src/codegen/gen_assists_docs.rs b/xtask/src/codegen/gen_assists_docs.rs
index 1ae1343a5..c469b388d 100644
--- a/xtask/src/codegen/gen_assists_docs.rs
+++ b/xtask/src/codegen/gen_assists_docs.rs
@@ -7,12 +7,12 @@ use crate::{
     project_root, rust_files_in, Result,
 };
 
-pub fn generate_assists_tests(mode: Mode) -> Result<()> {
+pub(crate) fn generate_assists_tests(mode: Mode) -> Result<()> {
     let assists = Assist::collect()?;
     generate_tests(&assists, mode)
 }
 
-pub fn generate_assists_docs(mode: Mode) -> Result<()> {
+pub(crate) fn generate_assists_docs(mode: Mode) -> Result<()> {
     let assists = Assist::collect()?;
     let contents = assists.into_iter().map(|it| it.to_string()).collect::<Vec<_>>().join("\n\n");
     let contents = format!("//{}\n{}\n", PREAMBLE, contents.trim());
diff --git a/xtask/src/codegen/gen_diagnostic_docs.rs b/xtask/src/codegen/gen_diagnostic_docs.rs
index 7c14d4a07..a2561817b 100644
--- a/xtask/src/codegen/gen_diagnostic_docs.rs
+++ b/xtask/src/codegen/gen_diagnostic_docs.rs
@@ -7,7 +7,7 @@ use crate::{
     project_root, rust_files, Result,
 };
 
-pub fn generate_diagnostic_docs(mode: Mode) -> Result<()> {
+pub(crate) fn generate_diagnostic_docs(mode: Mode) -> Result<()> {
     let diagnostics = Diagnostic::collect()?;
     let contents =
         diagnostics.into_iter().map(|it| it.to_string()).collect::<Vec<_>>().join("\n\n");
diff --git a/xtask/src/codegen/gen_feature_docs.rs b/xtask/src/codegen/gen_feature_docs.rs
index 61081063b..cad7ff477 100644
--- a/xtask/src/codegen/gen_feature_docs.rs
+++ b/xtask/src/codegen/gen_feature_docs.rs
@@ -7,7 +7,7 @@ use crate::{
     project_root, rust_files, Result,
 };
 
-pub fn generate_feature_docs(mode: Mode) -> Result<()> {
+pub(crate) fn generate_feature_docs(mode: Mode) -> Result<()> {
     let features = Feature::collect()?;
     let contents = features.into_iter().map(|it| it.to_string()).collect::<Vec<_>>().join("\n\n");
     let contents = format!("//{}\n{}\n", PREAMBLE, contents.trim());
diff --git a/xtask/src/codegen/gen_lint_completions.rs b/xtask/src/codegen/gen_lint_completions.rs
index 8c51d35c7..b1c057037 100644
--- a/xtask/src/codegen/gen_lint_completions.rs
+++ b/xtask/src/codegen/gen_lint_completions.rs
@@ -10,7 +10,7 @@ use crate::{
     run_rustfmt,
 };
 
-pub fn generate_lint_completions(mode: Mode) -> Result<()> {
+pub(crate) fn generate_lint_completions(mode: Mode) -> Result<()> {
     if !Path::new("./target/rust").exists() {
         cmd!("git clone --depth=1 https://github.com/rust-lang/rust ./target/rust").run()?;
     }
diff --git a/xtask/src/codegen/gen_parser_tests.rs b/xtask/src/codegen/gen_parser_tests.rs
index 6e4abd10c..cb8939063 100644
--- a/xtask/src/codegen/gen_parser_tests.rs
+++ b/xtask/src/codegen/gen_parser_tests.rs
@@ -12,7 +12,7 @@ use crate::{
     project_root, Result,
 };
 
-pub fn generate_parser_tests(mode: Mode) -> Result<()> {
+pub(crate) fn generate_parser_tests(mode: Mode) -> Result<()> {
     let tests = tests_from_dir(&project_root().join(Path::new("crates/parser/src/grammar")))?;
     fn install_tests(tests: &HashMap<String, Test>, into: &str, mode: Mode) -> Result<()> {
         let tests_dir = project_root().join(into);
diff --git a/xtask/src/codegen/gen_syntax.rs b/xtask/src/codegen/gen_syntax.rs
index eb524d85a..191bc0e9d 100644
--- a/xtask/src/codegen/gen_syntax.rs
+++ b/xtask/src/codegen/gen_syntax.rs
@@ -18,7 +18,7 @@ use crate::{
     project_root, Result,
 };
 
-pub fn generate_syntax(mode: Mode) -> Result<()> {
+pub(crate) fn generate_syntax(mode: Mode) -> Result<()> {
     let grammar = rust_grammar();
     let ast = lower(&grammar);
 
diff --git a/xtask/src/dist.rs b/xtask/src/dist.rs
index 56bf9f99d..f2503f807 100644
--- a/xtask/src/dist.rs
+++ b/xtask/src/dist.rs
@@ -11,13 +11,13 @@ use xshell::{cmd, cp, mkdir_p, pushd, read_file, rm_rf, write_file};
 
 use crate::{date_iso, project_root};
 
-pub struct DistCmd {
-    pub nightly: bool,
-    pub client_version: Option<String>,
+pub(crate) struct DistCmd {
+    pub(crate) nightly: bool,
+    pub(crate) client_version: Option<String>,
 }
 
 impl DistCmd {
-    pub fn run(self) -> Result<()> {
+    pub(crate) fn run(self) -> Result<()> {
         let dist = project_root().join("dist");
         rm_rf(&dist)?;
         mkdir_p(&dist)?;
diff --git a/xtask/src/install.rs b/xtask/src/install.rs
index 4c5c2673c..ea2194248 100644
--- a/xtask/src/install.rs
+++ b/xtask/src/install.rs
@@ -8,13 +8,13 @@ use xshell::{cmd, pushd};
 // Latest stable, feel free to send a PR if this lags behind.
 const REQUIRED_RUST_VERSION: u32 = 50;
 
-pub struct InstallCmd {
-    pub client: Option<ClientOpt>,
-    pub server: Option<ServerOpt>,
+pub(crate) struct InstallCmd {
+    pub(crate) client: Option<ClientOpt>,
+    pub(crate) server: Option<ServerOpt>,
 }
 
 #[derive(Clone, Copy)]
-pub enum ClientOpt {
+pub(crate) enum ClientOpt {
     VsCode,
     VsCodeExploration,
     VsCodeInsiders,
@@ -24,7 +24,7 @@ pub enum ClientOpt {
 }
 
 impl ClientOpt {
-    pub const fn as_cmds(&self) -> &'static [&'static str] {
+    pub(crate) const fn as_cmds(&self) -> &'static [&'static str] {
         match self {
             ClientOpt::VsCode => &["code"],
             ClientOpt::VsCodeExploration => &["code-exploration"],
@@ -60,18 +60,18 @@ impl std::str::FromStr for ClientOpt {
     }
 }
 
-pub struct ServerOpt {
-    pub malloc: Malloc,
+pub(crate) struct ServerOpt {
+    pub(crate) malloc: Malloc,
 }
 
-pub enum Malloc {
+pub(crate) enum Malloc {
     System,
     Mimalloc,
     Jemalloc,
 }
 
 impl InstallCmd {
-    pub fn run(self) -> Result<()> {
+    pub(crate) fn run(self) -> Result<()> {
         if cfg!(target_os = "macos") {
             fix_path_for_mac().context("Fix path for mac")?
         }
diff --git a/xtask/src/lib.rs b/xtask/src/lib.rs
deleted file mode 100644
index b19985fb2..000000000
--- a/xtask/src/lib.rs
+++ /dev/null
@@ -1,131 +0,0 @@
-//! Support library for `cargo xtask` command.
-//!
-//! See https://github.com/matklad/cargo-xtask/
-
-pub mod codegen;
-mod ast_src;
-
-pub mod install;
-pub mod release;
-pub mod dist;
-pub mod pre_commit;
-pub mod metrics;
-pub mod pre_cache;
-
-use std::{
-    env,
-    path::{Path, PathBuf},
-};
-
-use walkdir::{DirEntry, WalkDir};
-use xshell::{cmd, pushd, pushenv};
-
-use crate::codegen::Mode;
-
-pub use anyhow::{bail, Context as _, Result};
-
-pub fn project_root() -> PathBuf {
-    Path::new(
-        &env::var("CARGO_MANIFEST_DIR").unwrap_or_else(|_| env!("CARGO_MANIFEST_DIR").to_owned()),
-    )
-    .ancestors()
-    .nth(1)
-    .unwrap()
-    .to_path_buf()
-}
-
-pub fn rust_files() -> impl Iterator<Item = PathBuf> {
-    rust_files_in(&project_root().join("crates"))
-}
-
-pub fn cargo_files() -> impl Iterator<Item = PathBuf> {
-    files_in(&project_root(), "toml")
-        .filter(|path| path.file_name().map(|it| it == "Cargo.toml").unwrap_or(false))
-}
-
-pub fn rust_files_in(path: &Path) -> impl Iterator<Item = PathBuf> {
-    files_in(path, "rs")
-}
-
-pub fn run_rustfmt(mode: Mode) -> Result<()> {
-    let _dir = pushd(project_root())?;
-    let _e = pushenv("RUSTUP_TOOLCHAIN", "stable");
-    ensure_rustfmt()?;
-    let check = match mode {
-        Mode::Overwrite => &[][..],
-        Mode::Verify => &["--", "--check"],
-    };
-    cmd!("cargo fmt {check...}").run()?;
-    Ok(())
-}
-
-fn ensure_rustfmt() -> Result<()> {
-    let out = cmd!("rustfmt --version").read()?;
-    if !out.contains("stable") {
-        bail!(
-            "Failed to run rustfmt from toolchain 'stable'. \
-             Please run `rustup component add rustfmt --toolchain stable` to install it.",
-        )
-    }
-    Ok(())
-}
-
-pub fn run_clippy() -> Result<()> {
-    if cmd!("cargo clippy --version").read().is_err() {
-        bail!(
-            "Failed run cargo clippy. \
-            Please run `rustup component add clippy` to install it.",
-        )
-    }
-
-    let allowed_lints = "
-        -A clippy::collapsible_if
-        -A clippy::needless_pass_by_value
-        -A clippy::nonminimal_bool
-        -A clippy::redundant_pattern_matching
-    "
-    .split_ascii_whitespace();
-    cmd!("cargo clippy --all-features --all-targets -- {allowed_lints...}").run()?;
-    Ok(())
-}
-
-pub fn run_fuzzer() -> Result<()> {
-    let _d = pushd("./crates/syntax")?;
-    let _e = pushenv("RUSTUP_TOOLCHAIN", "nightly");
-    if cmd!("cargo fuzz --help").read().is_err() {
-        cmd!("cargo install cargo-fuzz").run()?;
-    };
-
-    // Expecting nightly rustc
-    let out = cmd!("rustc --version").read()?;
-    if !out.contains("nightly") {
-        bail!("fuzz tests require nightly rustc")
-    }
-
-    cmd!("cargo fuzz run parser").run()?;
-    Ok(())
-}
-
-fn date_iso() -> Result<String> {
-    let res = cmd!("date --iso --utc").read()?;
-    Ok(res)
-}
-
-fn is_release_tag(tag: &str) -> bool {
-    tag.len() == "2020-02-24".len() && tag.starts_with(|c: char| c.is_ascii_digit())
-}
-
-fn files_in(path: &Path, ext: &'static str) -> impl Iterator<Item = PathBuf> {
-    let iter = WalkDir::new(path);
-    return iter
-        .into_iter()
-        .filter_entry(|e| !is_hidden(e))
-        .map(|e| e.unwrap())
-        .filter(|e| !e.file_type().is_dir())
-        .map(|e| e.into_path())
-        .filter(move |path| path.extension().map(|it| it == ext).unwrap_or(false));
-
-    fn is_hidden(entry: &DirEntry) -> bool {
-        entry.file_name().to_str().map(|s| s.starts_with('.')).unwrap_or(false)
-    }
-}
diff --git a/xtask/src/main.rs b/xtask/src/main.rs
index cbb9b315e..84b17ce23 100644
--- a/xtask/src/main.rs
+++ b/xtask/src/main.rs
@@ -7,29 +7,37 @@
 //!
 //! This binary is integrated into the `cargo` command line by using an alias in
 //! `.cargo/config`.
+mod codegen;
+mod ast_src;
+#[cfg(test)]
+mod tidy;
 
-use std::env;
+mod install;
+mod release;
+mod dist;
+mod metrics;
+mod pre_cache;
 
-use anyhow::bail;
+use anyhow::{bail, Result};
 use codegen::CodegenCmd;
 use pico_args::Arguments;
-use xshell::{cmd, cp, pushd};
-use xtask::{
-    codegen::{self, Mode},
+use std::{
+    env,
+    path::{Path, PathBuf},
+};
+use walkdir::{DirEntry, WalkDir};
+use xshell::{cmd, cp, pushd, pushenv};
+
+use crate::{
+    codegen::Mode,
     dist::DistCmd,
     install::{InstallCmd, Malloc, ServerOpt},
     metrics::MetricsCmd,
     pre_cache::PreCacheCmd,
-    pre_commit, project_root,
     release::{PromoteCmd, ReleaseCmd},
-    run_clippy, run_fuzzer, run_rustfmt, Result,
 };
 
 fn main() -> Result<()> {
-    if env::args().next().map(|it| it.contains("pre-commit")) == Some(true) {
-        return pre_commit::run_hook();
-    }
-
     let _d = pushd(project_root())?;
 
     let mut args = Arguments::from_env();
@@ -90,14 +98,6 @@ FLAGS:
             finish_args(args)?;
             CodegenCmd { features }.run()
         }
-        "format" => {
-            finish_args(args)?;
-            run_rustfmt(Mode::Overwrite)
-        }
-        "install-pre-commit-hook" => {
-            finish_args(args)?;
-            pre_commit::install_hook()
-        }
         "lint" => {
             finish_args(args)?;
             run_clippy()
@@ -151,8 +151,6 @@ USAGE:
     cargo xtask <SUBCOMMAND>
 
 SUBCOMMANDS:
-    format
-    install-pre-commit-hook
     fuzz-tests
     codegen
     install
@@ -172,3 +170,110 @@ fn finish_args(args: Arguments) -> Result<()> {
     }
     Ok(())
 }
+
+fn project_root() -> PathBuf {
+    Path::new(
+        &env::var("CARGO_MANIFEST_DIR").unwrap_or_else(|_| env!("CARGO_MANIFEST_DIR").to_owned()),
+    )
+    .ancestors()
+    .nth(1)
+    .unwrap()
+    .to_path_buf()
+}
+
+fn rust_files() -> impl Iterator<Item = PathBuf> {
+    rust_files_in(&project_root().join("crates"))
+}
+
+#[cfg(test)]
+fn cargo_files() -> impl Iterator<Item = PathBuf> {
+    files_in(&project_root(), "toml")
+        .filter(|path| path.file_name().map(|it| it == "Cargo.toml").unwrap_or(false))
+}
+
+fn rust_files_in(path: &Path) -> impl Iterator<Item = PathBuf> {
+    files_in(path, "rs")
+}
+
+fn run_rustfmt(mode: Mode) -> Result<()> {
+    let _dir = pushd(project_root())?;
+    let _e = pushenv("RUSTUP_TOOLCHAIN", "stable");
+    ensure_rustfmt()?;
+    let check = match mode {
+        Mode::Overwrite => &[][..],
+        Mode::Verify => &["--", "--check"],
+    };
+    cmd!("cargo fmt {check...}").run()?;
+    Ok(())
+}
+
+fn ensure_rustfmt() -> Result<()> {
+    let out = cmd!("rustfmt --version").read()?;
+    if !out.contains("stable") {
+        bail!(
+            "Failed to run rustfmt from toolchain 'stable'. \
+             Please run `rustup component add rustfmt --toolchain stable` to install it.",
+        )
+    }
+    Ok(())
+}
+
+fn run_clippy() -> Result<()> {
+    if cmd!("cargo clippy --version").read().is_err() {
+        bail!(
+            "Failed run cargo clippy. \
+            Please run `rustup component add clippy` to install it.",
+        )
+    }
+
+    let allowed_lints = "
+        -A clippy::collapsible_if
+        -A clippy::needless_pass_by_value
+        -A clippy::nonminimal_bool
+        -A clippy::redundant_pattern_matching
+    "
+    .split_ascii_whitespace();
+    cmd!("cargo clippy --all-features --all-targets -- {allowed_lints...}").run()?;
+    Ok(())
+}
+
+fn run_fuzzer() -> Result<()> {
+    let _d = pushd("./crates/syntax")?;
+    let _e = pushenv("RUSTUP_TOOLCHAIN", "nightly");
+    if cmd!("cargo fuzz --help").read().is_err() {
+        cmd!("cargo install cargo-fuzz").run()?;
+    };
+
+    // Expecting nightly rustc
+    let out = cmd!("rustc --version").read()?;
+    if !out.contains("nightly") {
+        bail!("fuzz tests require nightly rustc")
+    }
+
+    cmd!("cargo fuzz run parser").run()?;
+    Ok(())
+}
+
+fn date_iso() -> Result<String> {
+    let res = cmd!("date --iso --utc").read()?;
+    Ok(res)
+}
+
+fn is_release_tag(tag: &str) -> bool {
+    tag.len() == "2020-02-24".len() && tag.starts_with(|c: char| c.is_ascii_digit())
+}
+
+fn files_in(path: &Path, ext: &'static str) -> impl Iterator<Item = PathBuf> {
+    let iter = WalkDir::new(path);
+    return iter
+        .into_iter()
+        .filter_entry(|e| !is_hidden(e))
+        .map(|e| e.unwrap())
+        .filter(|e| !e.file_type().is_dir())
+        .map(|e| e.into_path())
+        .filter(move |path| path.extension().map(|it| it == ext).unwrap_or(false));
+
+    fn is_hidden(entry: &DirEntry) -> bool {
+        entry.file_name().to_str().map(|s| s.starts_with('.')).unwrap_or(false)
+    }
+}
diff --git a/xtask/src/metrics.rs b/xtask/src/metrics.rs
index 624ad3b7e..babc2a6d4 100644
--- a/xtask/src/metrics.rs
+++ b/xtask/src/metrics.rs
@@ -11,12 +11,12 @@ use xshell::{cmd, mkdir_p, pushd, pushenv, read_file, rm_rf};
 
 type Unit = String;
 
-pub struct MetricsCmd {
-    pub dry_run: bool,
+pub(crate) struct MetricsCmd {
+    pub(crate) dry_run: bool,
 }
 
 impl MetricsCmd {
-    pub fn run(self) -> Result<()> {
+    pub(crate) fn run(self) -> Result<()> {
         let mut metrics = Metrics::new()?;
         if !self.dry_run {
             rm_rf("./target/release")?;
diff --git a/xtask/src/pre_cache.rs b/xtask/src/pre_cache.rs
index 569f88f68..54f4a95a9 100644
--- a/xtask/src/pre_cache.rs
+++ b/xtask/src/pre_cache.rs
@@ -6,12 +6,12 @@ use std::{
 use anyhow::Result;
 use xshell::rm_rf;
 
-pub struct PreCacheCmd;
+pub(crate) struct PreCacheCmd;
 
 impl PreCacheCmd {
     /// Cleans the `./target` dir after the build such that only
     /// dependencies are cached on CI.
-    pub fn run(self) -> Result<()> {
+    pub(crate) fn run(self) -> Result<()> {
         let slow_tests_cookie = Path::new("./target/.slow_tests_cookie");
         if !slow_tests_cookie.exists() {
             panic!("slow tests were skipped on CI!")
diff --git a/xtask/src/pre_commit.rs b/xtask/src/pre_commit.rs
deleted file mode 100644
index 8f2dbea19..000000000
--- a/xtask/src/pre_commit.rs
+++ /dev/null
@@ -1,38 +0,0 @@
-//! pre-commit hook for code formatting.
-
-use std::{fs, path::PathBuf};
-
-use anyhow::{bail, Result};
-use xshell::cmd;
-
-use crate::{project_root, run_rustfmt, Mode};
-
-// FIXME: if there are changed `.ts` files, also reformat TypeScript (by
-// shelling out to `npm fmt`).
-pub fn run_hook() -> Result<()> {
-    run_rustfmt(Mode::Overwrite)?;
-
-    let diff = cmd!("git diff --diff-filter=MAR --name-only --cached").read()?;
-
-    let root = project_root();
-    for line in diff.lines() {
-        let file = root.join(line);
-        cmd!("git update-index --add {file}").run()?;
-    }
-
-    Ok(())
-}
-
-pub fn install_hook() -> Result<()> {
-    let hook_path: PathBuf =
-        format!("./.git/hooks/pre-commit{}", std::env::consts::EXE_SUFFIX).into();
-
-    if hook_path.exists() {
-        bail!("Git hook already created");
-    }
-
-    let me = std::env::current_exe()?;
-    fs::copy(me, hook_path)?;
-
-    Ok(())
-}
diff --git a/xtask/src/release.rs b/xtask/src/release.rs
index 63556476d..5008881e4 100644
--- a/xtask/src/release.rs
+++ b/xtask/src/release.rs
@@ -4,12 +4,12 @@ use xshell::{cmd, cp, pushd, read_dir, write_file};
 
 use crate::{codegen, date_iso, is_release_tag, project_root, Mode, Result};
 
-pub struct ReleaseCmd {
-    pub dry_run: bool,
+pub(crate) struct ReleaseCmd {
+    pub(crate) dry_run: bool,
 }
 
 impl ReleaseCmd {
-    pub fn run(self) -> Result<()> {
+    pub(crate) fn run(self) -> Result<()> {
         if !self.dry_run {
             cmd!("git switch release").run()?;
             cmd!("git fetch upstream --tags --force").run()?;
@@ -86,12 +86,12 @@ https://github.com/sponsors/rust-analyzer[GitHub Sponsors].
     }
 }
 
-pub struct PromoteCmd {
-    pub dry_run: bool,
+pub(crate) struct PromoteCmd {
+    pub(crate) dry_run: bool,
 }
 
 impl PromoteCmd {
-    pub fn run(self) -> Result<()> {
+    pub(crate) fn run(self) -> Result<()> {
         let _dir = pushd("../rust-rust-analyzer")?;
         cmd!("git switch master").run()?;
         cmd!("git fetch upstream").run()?;
diff --git a/xtask/tests/tidy.rs b/xtask/src/tidy.rs
index a72498a38..63116ec6b 100644
--- a/xtask/tests/tidy.rs
+++ b/xtask/src/tidy.rs
@@ -4,7 +4,8 @@ use std::{
 };
 
 use xshell::{cmd, read_file};
-use xtask::{
+
+use crate::{
     cargo_files,
     codegen::{self, Mode},
     project_root, run_rustfmt, rust_files,