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

[glisse at gcc dot gnu.org]

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

--- Comment #2 from Marc Glisse <glisse at gcc dot gnu.org> ---
(In reply to Marc Glisse from comment #1)
> That would be my recent commit. We will probably need to add if(size!=0) in
> front of the call to memmove...

That's what we already do in stl_algobase.h and fstream.tcc. I notice that we
do not do it in char_traits.h for the generic version (we do for each
specialization). I don't know if memcpy in locale_facets.h is safe either.