[PATCH] D27387: [libc++] Add a key function for bad_function_call

[Eric Fiselier via Phabricator via cfe-commits]

EricWF added a comment.

I wonder if we should consider this a breaking ABI change and control it using a `_LIBCPP_ABI` macro. @mclow.lists thoughts?


https://reviews.llvm.org/D27387