Decouple

crates/ra_hir/src/db.rs

@@ -2,7 +2,7 @@
 
 use std::sync::Arc;
 
-use hir_def::{GenericDefId, LocalStructFieldId, TraitId, VariantId};
+use hir_def::{GenericDefId, ImplId, LocalStructFieldId, TraitId, VariantId};
 use ra_arena::map::ArenaMap;
 use ra_db::{salsa, CrateId};
 
@@ -13,7 +13,7 @@ use crate::{
         CallableDef, FnSig, GenericPredicate, InferenceResult, Substs, Ty, TyDefId, TypeCtor,
         ValueTyDefId,
     },
-    DefWithBody, ImplBlock,
+    DefWithBody,
 };
 
 pub use hir_def::db::{
@@ -63,7 +63,7 @@ pub trait HirDatabase: DefDatabase {
     fn impls_in_crate(&self, krate: CrateId) -> Arc<CrateImplBlocks>;
 
     #[salsa::invoke(crate::ty::traits::impls_for_trait_query)]
-    fn impls_for_trait(&self, krate: CrateId, trait_: TraitId) -> Arc<[ImplBlock]>;
+    fn impls_for_trait(&self, krate: CrateId, trait_: TraitId) -> Arc<[ImplId]>;
 
     /// This provides the Chalk trait solver instance. Because Chalk always
     /// works from a specific crate, this query is keyed on the crate; and

crates/ra_hir/src/ty/infer/coerce.rs

@@ -4,13 +4,17 @@
 //!
 //! See: https://doc.rust-lang.org/nomicon/coercions.html
 
-use hir_def::{lang_item::LangItemTarget, resolver::Resolver, AdtId};
+use hir_def::{
+    lang_item::LangItemTarget,
+    resolver::{HasResolver, Resolver},
+    AdtId,
+};
 use rustc_hash::FxHashMap;
 use test_utils::tested_by;
 
 use crate::{
     db::HirDatabase,
-    ty::{autoderef, Substs, Ty, TypeCtor, TypeWalk},
+    ty::{autoderef, Substs, TraitRef, Ty, TypeCtor, TypeWalk},
     Mutability,
 };
 
@@ -57,9 +61,18 @@ impl<'a, D: HirDatabase> InferenceContext<'a, D> {
 
         impls
             .iter()
-            .filter_map(|impl_block| {
+            .filter_map(|&impl_id| {
+                let impl_data = db.impl_data(impl_id);
+                let resolver = impl_id.resolver(db);
+                let target_ty = Ty::from_hir(db, &resolver, &impl_data.target_type);
+
                 // `CoerseUnsized` has one generic parameter for the target type.
-                let trait_ref = impl_block.target_trait_ref(db)?;
+                let trait_ref = TraitRef::from_hir(
+                    db,
+                    &resolver,
+                    impl_data.target_trait.as_ref()?,
+                    Some(target_ty),
+                )?;
                 let cur_from_ty = trait_ref.substs.0.get(0)?;
                 let cur_to_ty = trait_ref.substs.0.get(1)?;
 

crates/ra_hir/src/ty/traits.rs

@@ -2,7 +2,7 @@
 use std::sync::{Arc, Mutex};
 
 use chalk_ir::{cast::Cast, family::ChalkIr};
-use hir_def::{expr::ExprId, DefWithBodyId, TraitId, TypeAliasId};
+use hir_def::{expr::ExprId, DefWithBodyId, ImplId, TraitId, TypeAliasId};
 use log::debug;
 use ra_db::{impl_intern_key, salsa, CrateId};
 use ra_prof::profile;
@@ -79,7 +79,7 @@ pub(crate) fn impls_for_trait_query(
     db: &impl HirDatabase,
     krate: CrateId,
     trait_: TraitId,
-) -> Arc<[ImplBlock]> {
+) -> Arc<[ImplId]> {
     let mut impls = FxHashSet::default();
     // We call the query recursively here. On the one hand, this means we can
     // reuse results from queries for different crates; on the other hand, this
@@ -90,7 +90,7 @@ pub(crate) fn impls_for_trait_query(
         impls.extend(db.impls_for_trait(dep.crate_id, trait_).iter());
     }
     let crate_impl_blocks = db.impls_in_crate(krate);
-    impls.extend(crate_impl_blocks.lookup_impl_blocks_for_trait(trait_).map(ImplBlock::from));
+    impls.extend(crate_impl_blocks.lookup_impl_blocks_for_trait(trait_));
     impls.into_iter().collect()
 }
 

crates/ra_hir/src/ty/traits/chalk.rs

@@ -453,7 +453,7 @@ where
             .impls_for_trait(self.krate, trait_.into())
             .iter()
             .copied()
-            .map(Impl::ImplBlock)
+            .map(|it| Impl::ImplBlock(it.into()))
             .map(|impl_| impl_.to_chalk(self.db))
             .collect();