fixes #184, type literals now use emitTypeName

lib/src/utils.dart

Index: lib/src/utils.dart
diff --git a/lib/src/utils.dart b/lib/src/utils.dart
index ba0e0354a79b51e80256207403339ef1a8362e05..4c7339520c673f724b77c967c1d74164a4615bbe 100644
--- a/lib/src/utils.dart
+++ b/lib/src/utils.dart
@@ -375,9 +375,12 @@ Object getConstantField(
   return (f == null || f.type != expectedType) ? null : f.value;
 }
 
-ParameterizedType fillDynamicTypeArgs(ParameterizedType t, TypeProvider types) {
-  var dyn = new List.filled(t.typeArguments.length, types.dynamicType);
-  return t.substitute2(dyn, t.typeArguments);
+DartType fillDynamicTypeArgs(DartType t, TypeProvider types) {
+  if (t is ParameterizedType) {
+    var dyn = new List.filled(t.typeArguments.length, types.dynamicType);
+    return t.substitute2(dyn, t.typeArguments);
+  }
+  return t;
 }
 
 /// Similar to [SimpleIdentifier] inGetterContext, inSetterContext, and