Fix for issue 1480: analyze a method even if it does not have a body, and do not try to evaluate ...

dart/frog/gen.dart

 // Copyright (c) 2012, 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.
 
 /**
  * Top level generator object for writing code and keeping track of
  * dependencies.
  *
  * Should have two compilation models, but only one implemented so far.
  *
@@ skipping 981 matching lines @@
       Value currentArg = null;
       if (i < args.bareCount) {
         currentArg = args.values[i];
       } else {
         // Handle named or missing arguments
         currentArg = args.getValue(p.name);
         if (currentArg === null) {
           // Ensure default value for param has been generated
           p.genValue(method, this);
           currentArg = p.value;
+          if (currentArg == null) {
+            // Not enough arguments, we'll get an error later.
+            return;
+          }
         }
       }
 
       if (p.isInitializer) {
         _paramCode.add(p.name);
         fieldsSet = true;
         _initField(newObject, p.name, currentArg, p.definition.span);
       } else {
         var paramValue = _scope.declareParameter(p);
         _paramCode.add(paramValue.code);
@@ skipping 1428 matching lines @@
     return true;
   }
 
 }
 
 class ReturnKind {
   static final int IGNORE = 1;
   static final int POST = 2;
   static final int PRE = 3;
 }