Allow binary operators on compile-time-constants.

frog/leg/tree/nodes.dart

Index: frog/leg/tree/nodes.dart
diff --git a/frog/leg/tree/nodes.dart b/frog/leg/tree/nodes.dart
index c787f1696274675d04932001f05e35d62ee9b480..05804a557d2d101f7b2c643d2cc2c04d3bacbad1 100644
--- a/frog/leg/tree/nodes.dart
+++ b/frog/leg/tree/nodes.dart
@@ -703,6 +703,20 @@ class DartString implements Iterable<int> {
   bool definitelyEquals(DartString other) => toString() == other.toString();
   abstract Iterator<int> iterator();
   abstract String toString();
+
+  bool operator ==(var other) {
+    if (other is !DartString) return false;
+    DartString otherString = other;
+    if (length != otherString.length) return false;
+    Iterator it1 = iterator();
+    Iterator it2 = otherString.iterator();
+    while (it1.hasNext()) {
+      assert(it2.hasNext());

[ngeoffray, 2012/02/21 11:22:09]

I find this assert and the one line 717 too much.

[floitsch, 2012/02/22 10:17:51]

Done.

+      if (it1.next() != it2.next()) return false;
+    }
+    assert(!it2.hasNext());
+    return true;
+  }
 }
 
 class LiteralDartString extends DartString {