Disallow redundant Bind calls.

base/bind_unittest.nc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This is a "No Compile Test" suite.
 // http://dev.chromium.org/developers/testing/no-compile-tests
 
+#include <utility>
+
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 
 namespace base {
 
 // Do not put everything inside an anonymous namespace.  If you do, many of the
 // helper function declarations will generate unused definition warnings.
 
@@ skipping 183 matching lines @@
   Closure callback_mismatches_bind_type = Bind(&VoidPolymorphic1<int>);
 }
 
 #elif defined(NCTEST_DISALLOW_CAPTURING_LAMBDA)  // [r"fatal error: implicit instantiation of undefined template 'base::internal::FunctorTraits<\(lambda at ../../base/bind_unittest.nc:[0-9]+:[0-9]+\), void>'"]
 
 void WontCompile() {
   int i = 0;
   Bind([i]() {});
 }
 
+#elif defined(NCTEST_DISALLOW_BINDING_ONCE_CALLBACK_WITH_NO_ARGS)  // [r"static_assert failed \"Attempting to bind a base::Callback with no additional arguments: save a heap allocation and use the original base::Callback object\""]
+
+void WontCompile() {
+  internal::OnceClosure cb = internal::BindOnce([] {});
+  internal::OnceClosure cb2 = internal::BindOnce(std::move(cb));
+}
+
+#elif defined(NCTEST_DISALLOW_BINDING_REPEATING_CALLBACK_WITH_NO_ARGS)  // [r"static_assert failed \"Attempting to bind a base::Callback with no additional arguments: save a heap allocation and use the original base::Callback object\""]
+
+void WontCompile() {
+  Closure cb = Bind([] {});
+  Closure cb2 = Bind(cb);
+}
+
 #endif
 
 }  // namespace base