Pass interner to ProjectionTy::self_type_parameter

Author: lnicola

crates/hir_ty/src/display.rs

@@ -251,7 +251,7 @@ impl HirDisplay for ProjectionTy {
         }
 
         let trait_ = f.db.trait_data(self.trait_(f.db));
-        let first_parameter = self.self_type_parameter().into_displayable(
+        let first_parameter = self.self_type_parameter(&Interner).into_displayable(
             f.db,
             f.max_size,
             f.omit_verbose_types,
@@ -602,7 +602,7 @@ impl HirDisplay for Ty {
                                 WhereClause::AliasEq(AliasEq {
                                     alias: AliasTy::Projection(proj),
                                     ty: _,
-                                }) => proj.self_type_parameter() == self,
+                                }) => proj.self_type_parameter(&Interner) == self,
                                 _ => false,
                             })
                             .collect::<Vec<_>>();

crates/hir_ty/src/lib.rs

@@ -78,8 +78,8 @@ impl ProjectionTy {
         }
     }
 
-    pub fn self_type_parameter(&self) -> &Ty {
-        &self.substitution.interned()[0].assert_ty_ref(&Interner)
+    pub fn self_type_parameter(&self, interner: &Interner) -> &Ty {
+        &self.substitution.interned()[0].assert_ty_ref(interner)
     }
 
     fn trait_(&self, db: &dyn HirDatabase) -> TraitId {
@@ -477,7 +477,7 @@ impl Ty {
                                 WhereClause::AliasEq(AliasEq {
                                     alias: AliasTy::Projection(proj),
                                     ty: _,
-                                }) => proj.self_type_parameter() == self,
+                                }) => proj.self_type_parameter(&Interner) == self,
                                 _ => false,
                             })
                             .collect_vec();

crates/hir_ty/src/traits.rs

@@ -89,7 +89,7 @@ pub(crate) fn trait_solve_query(
         ..
     })) = &goal.value.goal
     {
-        if let TyKind::BoundVar(_) = projection_ty.self_type_parameter().kind(&Interner) {
+        if let TyKind::BoundVar(_) = projection_ty.self_type_parameter(&Interner).kind(&Interner) {
             // Hack: don't ask Chalk to normalize with an unknown self type, it'll say that's impossible
             return Some(Solution::Ambig(Guidance::Unknown));
         }

crates/hir_ty/src/traits/chalk/mapping.rs

@@ -552,7 +552,7 @@ pub(super) fn generic_predicate_to_inline_bound(
             Some(make_binders(rust_ir::InlineBound::TraitBound(trait_bound), pred.num_binders))
         }
         WhereClause::AliasEq(AliasEq { alias: AliasTy::Projection(projection_ty), ty }) => {
-            if projection_ty.self_type_parameter() != &self_ty_shifted_in {
+            if projection_ty.self_type_parameter(&Interner) != &self_ty_shifted_in {
                 return None;
             }
             let trait_ = projection_ty.trait_(db);