[Bug c++/123684] [14/15/16 Regression] ICE in check_abi_tag_args (tree check: expected tree_list, have error_mark) with empty abi_tag on namespace since r14-650

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123684

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Assignee|unassigned at gcc dot gnu.org      |jakub at gcc dot gnu.org
             Status|NEW                         |ASSIGNED

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 63453
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=63453&action=edit
gcc16-pr123684.patch

Untested fix.