Cleanup Field ty

crates/ra_hir/src/code_model.rs

@@ -265,8 +265,10 @@ impl StructField {
         self.parent.variant_data(db).fields()[self.id].name.clone()
     }
 
-    pub fn ty(&self, db: &impl HirDatabase) -> Ty {
-        db.field_types(self.parent.into())[self.id].clone()
+    pub fn ty(&self, db: &impl HirDatabase) -> Type {
+        let var_id = self.parent.into();
+        let ty = db.field_types(var_id)[self.id].clone();
+        Type::new(db, self.parent.module(db).id.krate.into(), var_id, ty)
     }
 
     pub fn parent_def(&self, _db: &impl HirDatabase) -> VariantDef {
@@ -940,15 +942,19 @@ pub struct Type {
 }
 
 impl Type {
+    fn new(db: &impl HirDatabase, krate: CrateId, lexical_env: impl HasResolver, ty: Ty) -> Type {
+        let resolver = lexical_env.resolver(db);
+        let environment = TraitEnvironment::lower(db, &resolver);
+        Type { krate, ty: InEnvironment { value: ty, environment } }
+    }
+
     fn from_def(
         db: &impl HirDatabase,
         krate: CrateId,
         def: impl HasResolver + Into<TyDefId>,
     ) -> Type {
-        let resolver = def.resolver(db);
-        let environment = TraitEnvironment::lower(db, &resolver);
         let ty = db.ty(def.into());
-        Type { krate, ty: InEnvironment { value: ty, environment } }
+        Type::new(db, krate, def, ty)
     }
 
     pub fn is_bool(&self) -> bool {
@@ -1039,11 +1045,16 @@ impl Type {
     ) -> Vec<(StructField, Type)> {
         // FIXME: check that ty and def match
         match &self.ty.value {
-            Ty::Apply(a_ty) => def
-                .fields(db)
+            Ty::Apply(a_ty) => {
+                let field_types = db.field_types(def.into());
+                def.fields(db)
                     .into_iter()
-                .map(|it| (it, self.derived(it.ty(db).subst(&a_ty.parameters))))
-                .collect(),
+                    .map(|it| {
+                        let ty = field_types[it.id].clone().subst(&a_ty.parameters);
+                        (it, self.derived(ty))
+                    })
+                    .collect()
+            }
             _ => Vec::new(),
         }
     }

crates/ra_hir_def/src/resolver.rs

@@ -19,7 +19,7 @@ use crate::{
     per_ns::PerNs,
     AdtId, AstItemDef, ConstId, ContainerId, DefWithBodyId, EnumId, EnumVariantId, FunctionId,
     GenericDefId, HasModule, ImplId, LocalModuleId, Lookup, ModuleDefId, ModuleId, StaticId,
-    StructId, TraitId, TypeAliasId, TypeParamId,
+    StructId, TraitId, TypeAliasId, TypeParamId, VariantId,
 };
 
 #[derive(Debug, Clone, Default)]
@@ -544,16 +544,6 @@ impl HasResolver for FunctionId {
     }
 }
 
-impl HasResolver for DefWithBodyId {
-    fn resolver(self, db: &impl DefDatabase) -> Resolver {
-        match self {
-            DefWithBodyId::ConstId(c) => c.resolver(db),
-            DefWithBodyId::FunctionId(f) => f.resolver(db),
-            DefWithBodyId::StaticId(s) => s.resolver(db),
-        }
-    }
-}
-
 impl HasResolver for ConstId {
     fn resolver(self, db: &impl DefDatabase) -> Resolver {
         self.lookup(db).container.resolver(db)
@@ -572,6 +562,25 @@ impl HasResolver for TypeAliasId {
     }
 }
 
+impl HasResolver for ImplId {
+    fn resolver(self, db: &impl DefDatabase) -> Resolver {
+        self.module(db)
+            .resolver(db)
+            .push_generic_params_scope(db, self.into())
+            .push_impl_block_scope(self)
+    }
+}
+
+impl HasResolver for DefWithBodyId {
+    fn resolver(self, db: &impl DefDatabase) -> Resolver {
+        match self {
+            DefWithBodyId::ConstId(c) => c.resolver(db),
+            DefWithBodyId::FunctionId(f) => f.resolver(db),
+            DefWithBodyId::StaticId(s) => s.resolver(db),
+        }
+    }
+}
+
 impl HasResolver for ContainerId {
     fn resolver(self, db: &impl DefDatabase) -> Resolver {
         match self {
@@ -596,11 +605,12 @@ impl HasResolver for GenericDefId {
     }
 }
 
-impl HasResolver for ImplId {
+impl HasResolver for VariantId {
     fn resolver(self, db: &impl DefDatabase) -> Resolver {
-        self.module(db)
-            .resolver(db)
-            .push_generic_params_scope(db, self.into())
-            .push_impl_block_scope(self)
+        match self {
+            VariantId::EnumVariantId(it) => it.parent.resolver(db),
+            VariantId::StructId(it) => it.resolver(db),
+            VariantId::UnionId(it) => it.resolver(db),
+        }
     }
 }