Include command in ProcessException.

runtime/bin/process_patch.dart

Index: runtime/bin/process_patch.dart
diff --git a/runtime/bin/process_patch.dart b/runtime/bin/process_patch.dart
index ff99345f4a2b4c75e82e628c36b5bef6f2e6f6ed..4d383b6d5e01188eb08824391c6bb939708b21ee 100644
--- a/runtime/bin/process_patch.dart
+++ b/runtime/bin/process_patch.dart
@@ -157,8 +157,11 @@ class _ProcessImpl extends NativeFieldWrapperClass1 implements Process {
         _out.close();
         _err.close();
         _exitHandler.close();
+        var arguments = Strings.join(_arguments, ' ');
         completer.completeException(
-            new ProcessException(status._errorMessage, status._errorCode));
+            new ProcessException('$_path $arguments',

[Søren Gjesse, 2012/11/16 12:45:02]

We could also place path and arguments on the Process Exception. Then have the
formatting there in toString and make path and arguments available on the
exception.

[Mads Ager (google), 2012/11/16 13:00:30]

Done.

+                                 status._errorMessage,
+                                 status._errorCode));
         return;
       }
       _started = true;
@@ -245,7 +248,8 @@ class _ProcessImpl extends NativeFieldWrapperClass1 implements Process {
 
   void set onExit(void callback(int exitCode)) {
     if (_ended) {
-      throw new ProcessException("Process killed");
+      var arguments = Strings.join(_arguments, ' ');
+      throw new ProcessException("$_path $arguments", "Process killed");
     }
     _onExit = callback;
   }