[Bug libstdc++/87787] [9 Regression][UBSAN] runtime error: null pointer passed as argument 2, which is declared to never be null

[burnus at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87787

--- Comment #4 from Tobias Burnus <burnus at gcc dot gnu.org> ---
(In reply to Marc Glisse from comment #1)
> That would be my recent commit.

Namely, the commit r265485 of 2018-10-25: "Relocation (= move+destroy)"
PR libstdc++/87106