[Bug c++/79296] [7 Regression] ICE in mangle_decl, at cp/mangle.c:3845

[nathan at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79296

--- Comment #2 from Nathan Sidwell <nathan at gcc dot gnu.org> ---
Created attachment 40648
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=40648&action=edit
reduced testcase

trying to mangle a lambda but asserting that it has linkage.