https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66487

--- Comment #1 from Jason Merrill <jason at gcc dot gnu.org> ---
Compiling with -fno-lifetime-dse should make it work again. 
-fsanitize=undefined doesn't currently catch this issue (relying on the value
of storage persisting into the lifetime of an object created there).

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