[Bug c++/83372] ICE in GC within gt_ggc_mx building Mir

[nathan at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83372

--- Comment #17 from Nathan Sidwell <nathan at gcc dot gnu.org> ---
This looks like the same bug, I've. committed the 84263 patch (r257584.)

Tickling this variant try adding "--param ggc-min-expand=0 --param
ggc-min-heapsize=0" and focus on the use of 
   decltype(complex-thing) (morecomplexstuff);