From b8262099cc51065259daf10b4b23ff49ce74434f Mon Sep 17 00:00:00 2001
From: Florian Diebold <flodiebold@gmail.com>
Date: Sun, 23 May 2021 23:54:35 +0200
Subject: Get rid of field_type again

---
 crates/hir/src/lib.rs             | 15 +--------------
 crates/hir/src/semantics.rs       |  7 +++++--
 crates/hir/src/source_analyzer.rs |  7 +++++--
 3 files changed, 11 insertions(+), 18 deletions(-)

(limited to 'crates/hir')

diff --git a/crates/hir/src/lib.rs b/crates/hir/src/lib.rs
index edee99356..ca9a7f7fa 100644
--- a/crates/hir/src/lib.rs
+++ b/crates/hir/src/lib.rs
@@ -514,8 +514,7 @@ impl Field {
 
     /// Returns the type as in the signature of the struct (i.e., with
     /// placeholder types for type parameters). Only use this in the context of
-    /// the field *definition*; if you've already got a variable of the struct
-    /// type, use `Type::field_type` to get to the field type.
+    /// the field definition.
     pub fn ty(&self, db: &dyn HirDatabase) -> Type {
         let var_id = self.parent.into();
         let generic_def_id: GenericDefId = match self.parent {
@@ -1944,18 +1943,6 @@ impl Type {
         }
     }
 
-    pub fn field_type(&self, db: &dyn HirDatabase, field: Field) -> Option<Type> {
-        let (adt_id, substs) = self.ty.as_adt()?;
-        let variant_id: hir_def::VariantId = field.parent.into();
-        if variant_id.adt_id() != adt_id {
-            return None;
-        }
-
-        let ty = db.field_types(variant_id).get(field.id)?.clone();
-        let ty = ty.substitute(&Interner, substs);
-        Some(self.derived(ty))
-    }
-
     pub fn fields(&self, db: &dyn HirDatabase) -> Vec<(Field, Type)> {
         let (variant_id, substs) = match self.ty.kind(&Interner) {
             &TyKind::Adt(hir_ty::AdtId(AdtId::StructId(s)), ref substs) => (s.into(), substs),
diff --git a/crates/hir/src/semantics.rs b/crates/hir/src/semantics.rs
index d65dd7df0..3aa467e3c 100644
--- a/crates/hir/src/semantics.rs
+++ b/crates/hir/src/semantics.rs
@@ -227,7 +227,7 @@ impl<'db, DB: HirDatabase> Semantics<'db, DB> {
     pub fn resolve_record_field(
         &self,
         field: &ast::RecordExprField,
-    ) -> Option<(Field, Option<Local>)> {
+    ) -> Option<(Field, Option<Local>, Type)> {
         self.imp.resolve_record_field(field)
     }
 
@@ -518,7 +518,10 @@ impl<'db> SemanticsImpl<'db> {
         self.analyze(field.syntax()).resolve_field(self.db, field)
     }
 
-    fn resolve_record_field(&self, field: &ast::RecordExprField) -> Option<(Field, Option<Local>)> {
+    fn resolve_record_field(
+        &self,
+        field: &ast::RecordExprField,
+    ) -> Option<(Field, Option<Local>, Type)> {
         self.analyze(field.syntax()).resolve_record_field(self.db, field)
     }
 
diff --git a/crates/hir/src/source_analyzer.rs b/crates/hir/src/source_analyzer.rs
index a1a9c727a..5a3d80e8e 100644
--- a/crates/hir/src/source_analyzer.rs
+++ b/crates/hir/src/source_analyzer.rs
@@ -161,7 +161,7 @@ impl SourceAnalyzer {
         &self,
         db: &dyn HirDatabase,
         field: &ast::RecordExprField,
-    ) -> Option<(Field, Option<Local>)> {
+    ) -> Option<(Field, Option<Local>, Type)> {
         let record_expr = ast::RecordExpr::cast(field.syntax().parent().and_then(|p| p.parent())?)?;
         let expr = ast::Expr::from(record_expr);
         let expr_id = self.body_source_map.as_ref()?.node_expr(InFile::new(self.file_id, &expr))?;
@@ -178,10 +178,13 @@ impl SourceAnalyzer {
                 _ => None,
             }
         };
+        let (_, subst) = self.infer.as_ref()?.type_of_expr.get(expr_id)?.as_adt()?;
         let variant = self.infer.as_ref()?.variant_resolution_for_expr(expr_id)?;
         let variant_data = variant.variant_data(db.upcast());
         let field = FieldId { parent: variant, local_id: variant_data.field(&local_name)? };
-        Some((field.into(), local))
+        let field_ty =
+            db.field_types(variant).get(field.local_id)?.clone().substitute(&Interner, subst);
+        Some((field.into(), local, Type::new_with_resolver(db, &self.resolver, field_ty)?))
     }
 
     pub(crate) fn resolve_record_pat_field(
-- 
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