fixes #131, use before define from variables to classes

lib/src/utils.dart

 // Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 /// Holds a couple utility functions used at various places in the system.
 library dev_compiler.src.utils;
 
 import 'dart:io';
 
 import 'package:path/path.dart' as path;
@@ skipping 369 matching lines @@
 /// value of that field.
 ///
 /// If the field is missing or is not [expectedType], returns null.
 Object getConstantField(
     DartObjectImpl value, String fieldName, DartType expectedType) {
   if (value == null) return null;
   var f = value.fields[fieldName];
   return (f == null || f.type != expectedType) ? null : f.value;
 }
 
-InterfaceType fillDynamicTypeArgs(InterfaceType t, TypeProvider types) =>
-    t.substitute4(new List.filled(t.typeArguments.length, types.dynamicType));
+ParameterizedType fillDynamicTypeArgs(ParameterizedType t, TypeProvider types) {
+  var dyn = new List.filled(t.typeArguments.length, types.dynamicType);
+  return t.substitute2(dyn, t.typeArguments);
+}
 
 /// Similar to [SimpleIdentifier] inGetterContext, inSetterContext, and
 /// inDeclarationContext, this method returns true if [node] is used in an
 /// invocation context such as a MethodInvocation.
 bool inInvocationContext(SimpleIdentifier node) {
   var parent = node.parent;
   return parent is MethodInvocation && parent.methodName == node;
 }
 
 // TODO(vsm): Move this onto the appropriate class.  Ideally, we'd attach
@@ skipping 28 matching lines @@
 InterfaceType findSupertype(InterfaceType type, bool match(InterfaceType t)) {
   for (var m in type.mixins.reversed) {
     if (match(m)) return m;
   }
   var s = type.superclass;
   if (s == null) return null;
 
   if (match(s)) return type;
   return findSupertype(s, match);
 }