[d110af5ccf]

The upstream bug: https://sourceware.org/bugzilla/show_bug.cgi?id=24323

An example of a problem provided in a different bug: https://sourceware.org/bugzilla/show_bug.cgi?id=11754#c15

But I don't really understand what's going on in that example.

Aside, it only took 9 years for that patch to get conclusively rejected.