[Bug libstdc++/92267] [9 Regression] crash with a cppunit test case (built by GCC 9) and cpptest (built with GCC 8)

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92267

--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Seems to be due to r260380