Make IsResource tolerant of types.Named types

pkg/tools/cidlc/gen_rpc.go

@@ -400,7 +400,7 @@ func (g *RPCGenerator) GenTypeName(t types.Type) string {
 	case *types.Named:
 		obj := u.Obj()
 		// For resource types, simply emit an ID, since that is what will have been serialized.
-		if isres, _ := IsResource(obj, u.Underlying()); isres {
+		if isres, _ := IsResource(obj, u); isres {
 			return "resource.ID"
 		}
 

pkg/tools/cidlc/types.go

@@ -27,6 +27,11 @@ var (
 // IsResource checks whether a type is a special IDL resource.  If yes, it returns true for the first boolean, and the
 // second boolean indicates whether the resource is named or not.
 func IsResource(obj *types.TypeName, t types.Type) (bool, bool) {
+	// If a named type, fetch the underlying.
+	if n, is := t.(*types.Named); is {
+		t = n.Underlying()
+	}
+
 	// If this is a resource type itself, then we're done.
 	if isres, isname := isResourceObj(obj); isres {
 		return isres, isname