Resolve paths to defs (functions currently) during type inference

crates/ra_syntax/src/ast/generated.rs

@@ -3083,7 +3083,11 @@ impl<R: TreeRoot<RaTypes>> RetTypeNode<R> {
 }
 
 
-impl<'a> RetType<'a> {}
+impl<'a> RetType<'a> {
+    pub fn type_ref(self) -> Option<TypeRef<'a>> {
+        super::child_opt(self)
+    }
+}
 
 // ReturnExpr
 #[derive(Debug, Clone, Copy,)]

crates/ra_syntax/src/grammar.ron

@@ -254,7 +254,7 @@ Grammar(
             ],
             options: [ "ParamList", ["body", "Block"], "RetType" ],
         ),
-        "RetType": (),
+        "RetType": (options: ["TypeRef"]),
         "StructDef": (
             traits: [
                 "NameOwner",