Version 1.6.2

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

Index: dart/sdk/lib/_internal/compiler/implementation/inferrer/simple_types_inferrer.dart
===================================================================
--- dart/sdk/lib/_internal/compiler/implementation/inferrer/simple_types_inferrer.dart	(revision 40080)
+++ dart/sdk/lib/_internal/compiler/implementation/inferrer/simple_types_inferrer.dart	(working copy)
@@ -573,6 +573,11 @@
   }
 
   T visitFunctionExpression(ast.FunctionExpression node) {
+    // We loose track of [this] in closures (see issue 20840). To be on
+    // the safe side, we mark [this] as exposed here. We could do better by
+    // analyzing the closure.
+    // TODO(herhut): Analyze whether closure exposes this.
+    isThisExposed = true;
     LocalFunctionElement element = elements.getFunctionDefinition(node);
     // We don't put the closure in the work queue of the
     // inferrer, because it will share information with its enclosing