[dart2dart] Make removal of asserts and forcing type strips go under

lib/compiler/implementation/dart2js.dart

Index: lib/compiler/implementation/dart2js.dart
diff --git a/lib/compiler/implementation/dart2js.dart b/lib/compiler/implementation/dart2js.dart
index 73d397bdf7fcf9834d1f5943340cbd9d16cd7238..eb355f150bd939066ae37de2a98da36276bd24b2 100644
--- a/lib/compiler/implementation/dart2js.dart
+++ b/lib/compiler/implementation/dart2js.dart
@@ -79,6 +79,7 @@ void compile(List<String> argv) {
   bool wantHelp = false;
   bool enableColors = false;
   String outputLanguage = 'JavaScript';
+  bool stripArgumentSet = false;
 
   passThrough(String argument) => options.add(argument);
 
@@ -107,6 +108,11 @@ void compile(List<String> argv) {
     passThrough(argument);
   }
 
+  setStrip(String argument) {
+    stripArgumentSet = true;
+    passThrough(argument);
+  }
+
   handleShortOptions(String argument) {
     var shortOptions = argument.substring(1).splitChars();
     for (var shortOption in shortOptions) {
@@ -138,7 +144,7 @@ void compile(List<String> argv) {
     new OptionHandler('--out=.+|-o.+', setOutput),
     new OptionHandler('--allow-mock-compilation', passThrough),
     new OptionHandler('--minify', passThrough),
-    new OptionHandler('--force-cut-declaration-types', passThrough),
+    new OptionHandler('--force-strip=.*', setStrip),
     // TODO(ahe): Remove the --no-colors option.
     new OptionHandler('--disable-diagnostic-colors', (_) => enableColors = false),
     new OptionHandler('--enable-diagnostic-colors', (_) => enableColors = true),
@@ -156,9 +162,12 @@ void compile(List<String> argv) {
   ];
 
   parseCommandLine(handlers, argv);
-
   if (wantHelp) helpAndExit(verbose);
 
+  if (outputLanguage != 'Dart' && stripArgumentSet) {

[ahe, 2012/10/01 10:19:22]

I like this check!

+    helpAndFail('Error: --force-strip may only be used with '
+        '--output-type=dart');
+  }
   if (arguments.isEmpty()) {
     helpAndFail('Error: No Dart file specified.');
   }