Handle cascade in type checker.

sdk/lib/_internal/compiler/implementation/typechecker.dart

Index: sdk/lib/_internal/compiler/implementation/typechecker.dart
diff --git a/sdk/lib/_internal/compiler/implementation/typechecker.dart b/sdk/lib/_internal/compiler/implementation/typechecker.dart
index c52c9fe1099e98ac560df201a32fb26e6779f517..f11266884cce4c87f7b69558ea5c7a7f0e9c0d96 100644
--- a/sdk/lib/_internal/compiler/implementation/typechecker.dart
+++ b/sdk/lib/_internal/compiler/implementation/typechecker.dart
@@ -511,11 +511,6 @@ class TypeCheckerVisitor extends Visitor<DartType> {
 
   DartType visitCascade(Cascade node) {
     analyze(node.expression);
-    if (node.expression.asCascadeReceiver() == null) {

[karlklose, 2014/03/31 14:13:40]

(If I remember correctly, I added this because of a crash, but it seems to work
now.)

When do we see [CascadeReceiver]s?

[Johnni Winther, 2014/04/01 06:45:05]

Never! [expression] is always a send.

-      // TODO(karlklose): bug: expressions of the form e..x = y do not have
-      // a CascadeReceiver as expression currently.
-      return types.dynamicType;
-    }
     return popCascadeType();
   }