[Bug c++/70121] [5/6/7 Regression] Spurious warning and crash when returning a reference from lambda

[ppalka at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70121

--- Comment #7 from Patrick Palka <ppalka at gcc dot gnu.org> ---
But as Jason said in comment #4, (IIUC) the test case never compiled correctly
in any gcc version.  It was marked a regression only because
-Wreturn-local-addr now deliberately returns null but arguably that's not a
regression either.