https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118309
--- Comment #1 from Iain Buclaw <ibuclaw at gcc dot gnu.org> ---
It looks like the cause is early debug hooks being called before types are
complete.
My sense is that almost all calls to rest_of_{type,decl}_compilation during the
codegen pass in the D frontend are too early as all forward references are not
strictly resolved until the last decl/type is generated.
So instead, either:
1. Don't call these, let the middle-end do this (via
finalize_compilation_unit?)
2. Call rest_of_decl_compilation on all known globals before/after
wrapup_global_declaration.
