Ensure interfaces are loaded.

dart/lib/compiler/implementation/typechecker.dart

Index: dart/lib/compiler/implementation/typechecker.dart
diff --git a/dart/lib/compiler/implementation/typechecker.dart b/dart/lib/compiler/implementation/typechecker.dart
index fbf0cece90c33e08aaf529e95ae8eaeff874b575..2c259b3ce7f096e28e5549fd5f2fb0e7669813e8 100644
--- a/dart/lib/compiler/implementation/typechecker.dart
+++ b/dart/lib/compiler/implementation/typechecker.dart
@@ -93,11 +93,11 @@ class InterfaceType implements Type {
 
 class FunctionType implements Type {
   final Element element;
-  final Type returnType;
-  final Link<Type> parameterTypes;
+  Type returnType;
+  Link<Type> parameterTypes;
 
-  const FunctionType(Type this.returnType, Link<Type> this.parameterTypes,
-                     Element this.element);
+  FunctionType(Type this.returnType, Link<Type> this.parameterTypes,
+               Element this.element);
 
   toString() {
     StringBuffer sb = new StringBuffer();
@@ -115,6 +115,13 @@ class FunctionType implements Type {
     parameterTypes.forEach((_) { arity++; });
     return arity;
   }
+
+  void initializeFrom(FunctionType other) {

[Lasse Reichstein Nielsen, 2012/08/07 09:02:17]

Why is this not a constructor?
I only see one use of it, and that's on a newly created FunctionType object.
I.e., I suggest:

FunctionType.from(FunctionType other, Element this.element) : returnType =
other.returnType, parameterTypes = other.parameterTypes;

+    assert(returnType === null);
+    assert(parameterTypes === null);
+    returnType = other.returnType;
+    parameterTypes = other.parameterTypes;
+  }
 }
 
 class Types {