Avoid reparsing metadata expressions

tests/compiler/dart2js_extra/23404_test.dart

Index: tests/compiler/dart2js_extra/23404_test.dart
diff --git a/tests/compiler/dart2js_extra/23404_test.dart b/tests/compiler/dart2js_extra/23404_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..113ee279e42c3454ae26a31189ec371d76ce9488
--- /dev/null
+++ b/tests/compiler/dart2js_extra/23404_test.dart
@@ -0,0 +1,2 @@
+foo([a="\u00a0"]) {}

[floitsch, 2015/05/07 01:14:29]

Add copyright header.

Add a comment explaining what the test does.

Create a test that actually does something. Use the expect-annotations to
confuse the type-inferrer and check that the result is correct:

/// <HEADER>
import 'package:expect/expect.dart';

// Dart2js was crashing when a default argument contained an escaped character.
foo([a='\u00a0']) => a;
bar() => '';

@NoInline
@AssumeDynamic
confuse(x) => x;

main() {
  Expect.equals('\u00a0', confuse(foo)());
  Expect.equals('', confuse(bar)());
}

[Siggi Cherem (dart-lang), 2015/05/07 16:29:23]

Done.

+main() => (foo)();