[Bug libstdc++/78627] [7 Regression] r243036 causes Firefox build failure

[trippels at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78627

--- Comment #1 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
Created attachment 40211
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=40211&action=edit
unreduced testcase