I've just experienced another such case after gcc-4.9 was "removed"
(#785249, which was reported upstream, and probably a whole more,
some of which are probably lost now).
PS: It's quite ironic that a bug report in which I also complained
about so many Debian bug reports sitting idly in the bug database
for years has now itself been sitting idly in the database for
almost a year without as much as a single response (not even a
"wontfix" if you don't care about this problem). To repeat myself, I
really wonder why I should report bugs at all anymore. :(