Version 0.5.20.4.

dart/sdk/lib/_internal/compiler/implementation/types/simple_types_inferrer.dart

Index: dart/sdk/lib/_internal/compiler/implementation/types/simple_types_inferrer.dart
===================================================================
--- dart/sdk/lib/_internal/compiler/implementation/types/simple_types_inferrer.dart	(revision 24273)
+++ dart/sdk/lib/_internal/compiler/implementation/types/simple_types_inferrer.dart	(working copy)
@@ -791,6 +791,10 @@
       ContainerTypeMask mask = selector.mask;
       TypeMask elementType = mask.elementType;
       return elementType == null ? dynamicType : elementType;
+    } else if (element.isGetter()) {
+      // Closure call.
+      assert(selector.isCall());
+      return dynamicType;
     } else {
       return returnTypeOfElement(element);
     }