Allow arguments to main.

sdk/lib/_internal/compiler/implementation/compiler.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.
 
 part of dart2js;
 
 /**
  * If true, print a warning for each method that was resolved, but not
  * compiled.
  */
@@ skipping 1010 matching lines @@
         }
       } else {
         if (!main.isFunction()) {
           reportFatalError(
               main,
               MessageKind.GENERIC,
               {'text': "Error: '$MAIN' is not a function."});
         }
         FunctionElement mainMethod = main;
         FunctionSignature parameters = mainMethod.computeSignature(this);
-        parameters.forEachParameter((Element parameter) {
-          reportError(
-              parameter,
-              MessageKind.GENERIC,
-              {'text':
-                "Error: '$MAIN' cannot have parameters."});
-        });
+        if (parameters.parameterCount > 2) {
+          int argumentCount = 0;
+          parameters.forEachParameter((Element parameter) {
+            argumentCount++;
+            if (argumentCount > 2) {
+              reportError(
+                  parameter,
+                  MessageKind.GENERIC,
+                  {'text':
+                    "Error: '$MAIN' cannot have more than 2 parameters."});
+            }
+          });
+        }
+        if (parameters.parameterCount == 2) {
+          enqueuer.resolution.enableIsolateSupport(main.getLibrary());
+        }
       }
 
       mirrorUsageAnalyzerTask.analyzeUsage(mainApp);
 
       // In order to see if a library is deferred, we must compute the
       // compile-time constants that are metadata.  This means adding
       // something to the resolution queue.  So we cannot wait with
       // this until after the resolution queue is processed.
       // TODO(ahe): Clean this up, for example, by not enqueueing
       // classes only used for metadata.
@@ skipping 565 matching lines @@
 
   void close() {}
 
   toString() => name;
 
   /// Convenience method for getting an [api.CompilerOutputProvider].
   static NullSink outputProvider(String name, String extension) {
     return new NullSink('$name.$extension');
   }
 }