Merge #3944

3944: Look up trait impls by self type r=matklad a=flodiebold

This speeds up inference in analysis-stats by ~30% (even more with the recursive solver).

There's a slight difference in inferred types, which I think comes from pre-existing wrong handling of error types in impls, so I think it's fine.

Co-authored-by: Florian Diebold <[email protected]>

1 files changed, 7 insertions, 2 deletions

diff --git a/crates/ra_hir_ty/src/db.rs b/crates/ra_hir_ty/src/db.rs
index 1462b053f..33da16b48 100644
--- a/crates/ra_hir_ty/src/db.rs
+++ b/crates/ra_hir_ty/src/db.rs
@@ -11,7 +11,7 @@ use ra_db::{impl_intern_key, salsa, CrateId, Upcast};
 use ra_prof::profile;
 
 use crate::{
-    method_resolution::CrateImplDefs,
+    method_resolution::{CrateImplDefs, TyFingerprint},
     traits::{chalk, AssocTyValue, Impl},
     Binders, CallableDef, GenericPredicate, InferenceResult, PolyFnSig, Substs, TraitRef, Ty,
     TyDefId, TypeCtor, ValueTyDefId,
@@ -65,7 +65,12 @@ pub trait HirDatabase: DefDatabase + Upcast<dyn DefDatabase> {
     fn impls_in_crate(&self, krate: CrateId) -> Arc<CrateImplDefs>;
 
     #[salsa::invoke(crate::traits::impls_for_trait_query)]
-    fn impls_for_trait(&self, krate: CrateId, trait_: TraitId) -> Arc<[ImplId]>;
+    fn impls_for_trait(
+        &self,
+        krate: CrateId,
+        trait_: TraitId,
+        self_ty_fp: Option<TyFingerprint>,
+    ) -> Arc<[ImplId]>;
 
     // Interned IDs for Chalk integration
     #[salsa::interned]