Do not track parameter types of closures, since closure calls can be generated during the emitter.

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

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library universe;
 
 import '../closure.dart';
 import '../elements/elements.dart';
 import '../dart2jslib.dart';
 import '../tree/tree.dart';
@@ skipping 197 matching lines @@
       : this(SelectorKind.CALL, const SourceString(""), library, 0, const []);
 
   // TODO(kasperl): This belongs somewhere else.
   Selector.noSuchMethod()
       : this(SelectorKind.CALL, Compiler.NO_SUCH_METHOD, null,
              Compiler.NO_SUCH_METHOD_ARG_COUNT);
 
   bool isGetter() => identical(kind, SelectorKind.GETTER);
   bool isSetter() => identical(kind, SelectorKind.SETTER);
   bool isCall() => identical(kind, SelectorKind.CALL);
+  bool isClosureCall() {
+    SourceString callName = Compiler.CALL_OPERATOR_NAME;
+    return isCall() && name == callName;
+  }
 
   bool isIndex() => identical(kind, SelectorKind.INDEX) && argumentCount == 1;
   bool isIndexSet() => identical(kind, SelectorKind.INDEX) && argumentCount == 2;
 
   bool isOperator() => identical(kind, SelectorKind.OPERATOR);
   bool isUnaryOperator() => isOperator() && argumentCount == 0;
   bool isBinaryOperator() => isOperator() && argumentCount == 1;
 
   /** Check whether this is a call to 'assert'. */
   bool isAssert() => isCall() && identical(name.stringValue, "assert");
@@ skipping 247 matching lines @@
     ClassElement cls = self;
     if (cls.isSubclassOf(other)) {
       // Resolve an invocation of [element.name] on [self]. If it
       // is found, this selector is a candidate.
       return hasElementIn(self, element) && appliesUntyped(element, compiler);
     }
 
     return false;
   }
 }