Rename uses of _ and __ because these are getting stepped on by macros from other system code. git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@167038 91177308-0d34-0410-b5e6-96231b3b80d8 
diff --git a/include/tuple b/include/tuple index 65af3eb..3fa6730 100644 --- a/include/tuple +++ b/include/tuple 
@@ -142,7 +142,7 @@  struct __has_allocator_type  {  private: - struct __two {char _; char __;}; + struct __two {char __lx; char __lxx;};  template <class _Up> static __two __test(...);  template <class _Up> static char __test(typename _Up::allocator_type* = 0);  public: