Improve List implementation.

dart/frog/leg/ssa/nodes.dart

Index: dart/frog/leg/ssa/nodes.dart
diff --git a/dart/frog/leg/ssa/nodes.dart b/dart/frog/leg/ssa/nodes.dart
index 0d7b4f125531863bd126db9ae7059388157619cf..bfd87faa20f0df9ff91a135af04d93812d7b5c7c 100644
--- a/dart/frog/leg/ssa/nodes.dart
+++ b/dart/frog/leg/ssa/nodes.dart
@@ -1091,7 +1091,8 @@ class HInvokeInterceptor extends HInvokeStatic {
   accept(HVisitor visitor) => visitor.visitInvokeInterceptor(this);
 
   HType computeType() {
-    if (name == const SourceString('length') && inputs[1].isStringOrArray()) {
+    if (name == const SourceString('length') && inputs[1].isStringOrArray()
+        && inputs.length == 2) {

[ngeoffray, 2012/02/21 10:41:45]

We could have a boolean setter in this class. It's not obvious that you're
looking for a getter here.

[ahe, 2012/02/21 23:03:25]

There is a boolean "getter" which I can use.

[ngeoffray, 2012/02/22 08:52:04]

Yes, but I think you're setting it to true in the builder even for a setter.
Setting it to false, or an extra boolean, both work for me.

       builtinJsName = 'length';
       return HType.INTEGER;
     } else if (name == const SourceString('add') && inputs[1].isArray()) {