https://gcc.gnu.org/bugzilla/show_bug.cgi?id=55922
--- Comment #14 from Jonathan Wakely <redi at gcc dot gnu.org> --- The testcase in comment 1 originally made three calls to _ZN4BaseC2Ev until r238688 when it made two, and then only one call after r238689 (the fix for PR 66617). So it looks like the reason it's still wrong on gcc-6-branch is that r238689 isn't on the branch.
