1 files changed, 37 insertions, 29 deletions

diff --git a/crates/ra_hir/src/ty.rs b/crates/ra_hir/src/ty.rs
index 3cbcbd1d0..388530f31 100644
--- a/crates/ra_hir/src/ty.rs
+++ b/crates/ra_hir/src/ty.rs
@@ -17,12 +17,15 @@ use std::ops::Deref;
 use std::sync::Arc;
 use std::{fmt, iter, mem};
 
-use hir_def::{generics::GenericParams, AdtId, GenericDefId};
+use hir_def::{
+    generics::GenericParams, AdtId, ContainerId, DefWithBodyId, GenericDefId, HasModule, Lookup,
+    TraitId, TypeAliasId,
+};
 use ra_db::{impl_intern_key, salsa};
 
 use crate::{
-    db::HirDatabase, expr::ExprId, util::make_mut_slice, Adt, Crate, DefWithBody, FloatTy, IntTy,
-    Mutability, Name, Trait, TypeAlias, Uncertain,
+    db::HirDatabase, expr::ExprId, util::make_mut_slice, Adt, Crate, FloatTy, IntTy, Mutability,
+    Name, Trait, Uncertain,
 };
 use display::{HirDisplay, HirFormatter};
 
@@ -107,13 +110,13 @@ pub enum TypeCtor {
     /// when we have tried to normalize a projection like `T::Item` but
     /// couldn't find a better representation.  In that case, we generate
     /// an **application type** like `(Iterator::Item)<T>`.
-    AssociatedType(TypeAlias),
+    AssociatedType(TypeAliasId),
 
     /// The type of a specific closure.
     ///
     /// The closure signature is stored in a `FnPtr` type in the first type
     /// parameter.
-    Closure { def: DefWithBody, expr: ExprId },
+    Closure { def: DefWithBodyId, expr: ExprId },
 }
 
 /// This exists just for Chalk, because Chalk just has a single `StructId` where
@@ -147,7 +150,7 @@ impl TypeCtor {
                 generic_params.count_params_including_parent()
             }
             TypeCtor::AssociatedType(type_alias) => {
-                let generic_params = db.generic_params(type_alias.id.into());
+                let generic_params = db.generic_params(type_alias.into());
                 generic_params.count_params_including_parent()
             }
             TypeCtor::FnPtr { num_args } => num_args as usize + 1,
@@ -169,10 +172,13 @@ impl TypeCtor {
             | TypeCtor::Ref(_)
             | TypeCtor::FnPtr { .. }
             | TypeCtor::Tuple { .. } => None,
-            TypeCtor::Closure { def, .. } => def.krate(db),
+            // Closure's krate is irrelevant for coherence I would think?
+            TypeCtor::Closure { .. } => None,
             TypeCtor::Adt(adt) => adt.krate(db),
             TypeCtor::FnDef(callable) => Some(callable.krate(db).into()),
-            TypeCtor::AssociatedType(type_alias) => type_alias.krate(db),
+            TypeCtor::AssociatedType(type_alias) => {
+                Some(type_alias.lookup(db).module(db).krate.into())
+            }
         }
     }
 
@@ -193,7 +199,7 @@ impl TypeCtor {
             | TypeCtor::Closure { .. } => None,
             TypeCtor::Adt(adt) => Some(adt.into()),
             TypeCtor::FnDef(callable) => Some(callable.into()),
-            TypeCtor::AssociatedType(type_alias) => Some(type_alias.id.into()),
+            TypeCtor::AssociatedType(type_alias) => Some(type_alias.into()),
         }
     }
 }
@@ -212,18 +218,19 @@ pub struct ApplicationTy {
 /// trait and all its parameters are fully known.
 #[derive(Clone, PartialEq, Eq, Debug, Hash)]
 pub struct ProjectionTy {
-    pub associated_ty: TypeAlias,
+    pub associated_ty: TypeAliasId,
     pub parameters: Substs,
 }
 
 impl ProjectionTy {
     pub fn trait_ref(&self, db: &impl HirDatabase) -> TraitRef {
-        TraitRef {
-            trait_: self
-                .associated_ty
-                .parent_trait(db)
-                .expect("projection ty without parent trait"),
-            substs: self.parameters.clone(),
+        TraitRef { trait_: self.trait_(db).into(), substs: self.parameters.clone() }
+    }
+
+    fn trait_(&self, db: &impl HirDatabase) -> TraitId {
+        match self.associated_ty.lookup(db).container {
+            ContainerId::TraitId(it) => it,
+            _ => panic!("projection ty without parent trait"),
         }
     }
 }
@@ -895,11 +902,12 @@ impl HirDisplay for ApplicationTy {
                 }
             }
             TypeCtor::AssociatedType(type_alias) => {
-                let trait_name = type_alias
-                    .parent_trait(f.db)
-                    .and_then(|t| t.name(f.db))
-                    .unwrap_or_else(Name::missing);
-                let name = type_alias.name(f.db);
+                let trait_ = match type_alias.lookup(f.db).container {
+                    ContainerId::TraitId(it) => it,
+                    _ => panic!("not an associated type"),
+                };
+                let trait_name = f.db.trait_data(trait_).name.clone().unwrap_or_else(Name::missing);
+                let name = f.db.type_alias_data(type_alias).name.clone();
                 write!(f, "{}::{}", trait_name, name)?;
                 if self.parameters.len() > 0 {
                     write!(f, "<")?;
@@ -926,18 +934,15 @@ impl HirDisplay for ProjectionTy {
             return write!(f, "…");
         }
 
-        let trait_name = self
-            .associated_ty
-            .parent_trait(f.db)
-            .and_then(|t| t.name(f.db))
-            .unwrap_or_else(Name::missing);
+        let trait_name =
+            f.db.trait_data(self.trait_(f.db)).name.clone().unwrap_or_else(Name::missing);
         write!(f, "<{} as {}", self.parameters[0].display(f.db), trait_name,)?;
         if self.parameters.len() > 1 {
             write!(f, "<")?;
             f.write_joined(&self.parameters[1..], ", ")?;
             write!(f, ">")?;
         }
-        write!(f, ">::{}", self.associated_ty.name(f.db))?;
+        write!(f, ">::{}", f.db.type_alias_data(self.associated_ty).name)?;
         Ok(())
     }
 }
@@ -1000,7 +1005,10 @@ impl HirDisplay for Ty {
                                 write!(f, "<")?;
                                 angle_open = true;
                             }
-                            let name = projection_pred.projection_ty.associated_ty.name(f.db);
+                            let name =
+                                f.db.type_alias_data(projection_pred.projection_ty.associated_ty)
+                                    .name
+                                    .clone();
                             write!(f, "{} = ", name)?;
                             projection_pred.ty.hir_fmt(f)?;
                         }
@@ -1076,7 +1084,7 @@ impl HirDisplay for GenericPredicate {
                 write!(
                     f,
                     ">::{} = {}",
-                    projection_pred.projection_ty.associated_ty.name(f.db),
+                    f.db.type_alias_data(projection_pred.projection_ty.associated_ty).name,
                     projection_pred.ty.display(f.db)
                 )?;
             }