https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89767
--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 7.x and earlier used to do:
/* The local structure or class can't use parameters of
the containing function anyway. */
if (DECL_CONTEXT (oldlocal) != current_function_decl)
{
cp_binding_level *scope = current_binding_level;
tree context = DECL_CONTEXT (oldlocal);
for (; scope; scope = scope->level_chain)
{
if (scope->kind == sk_function_parms
&& scope->this_entity == context)
break;
if (scope->kind == sk_class
&& !LAMBDA_TYPE_P (scope->this_entity))
{
nowarn = true;
break;
}
}
}
but r248123 after moving it to a different function changed it to:
/* The local structure or class can't use parameters of
the containing function anyway. */
if (DECL_CONTEXT (old) != current_function_decl)
{
for (cp_binding_level *scope = current_binding_level;
scope != old_scope; scope = scope->level_chain)
if (scope->kind == sk_class
&& !LAMBDA_TYPE_P (scope->this_entity))
return;
}
If old comes from a different function, such as in this case where there are
two nested instantiate_decl calls, one (the inner one) for av function above,
another one for aw, and I believe especially because the two functions aren't
lexically nested, it is just not possible to reach the old_scope (from the aw
function) from current_binding_level (in av function).
