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/future b/include/future
index 39475bd..cf552a9 100644
--- a/include/future
+++ b/include/future
@@ -391,7 +391,7 @@
#ifdef _LIBCPP_HAS_NO_STRONG_ENUMS
template <>
-struct _LIBCPP_VISIBLE is_error_code_enum<future_errc::_> : public true_type { };
+struct _LIBCPP_VISIBLE is_error_code_enum<future_errc::__lx> : public true_type { };
#endif
//enum class launch