Don't neglect to "return *this". git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@165860 91177308-0d34-0410-b5e6-96231b3b80d8 
diff --git a/include/functional b/include/functional index 8c166b7..ec5c5e5 100644 --- a/include/functional +++ b/include/functional 
@@ -1351,6 +1351,7 @@  __f_ = __f.__f_;  __f.__f_ = 0;  } + return *this;  }    template<class _Rp, class ..._ArgTypes> @@ -1362,6 +1363,7 @@  else if (__f_)  __f_->destroy_deallocate();  __f_ = 0; + return *this;  }    template<class _Rp, class ..._ArgTypes>