[Bug c++/99283] [modules] ICE in assert_definition, at cp/module.cc:4608

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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99283

--- Comment #10 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Nathan Sidwell <nathan@gcc.gnu.org>:

https://gcc.gnu.org/g:d82797420c2238e31a7a25fe6db6bd05cd37224d

commit r11-7866-gd82797420c2238e31a7a25fe6db6bd05cd37224d
Author: Nathan Sidwell <nathan@acm.org>
Date:   Fri Mar 26 10:46:31 2021 -0700

    c++: imported templates and alias-template changes [PR 99283]

    During development of modules, I had difficulty deciding whether the
    module flags of a template should live on the decl_template_result,
    the template_decl, or both.  I chose the latter, and require them to
    be consistent.  This and a few other defects show how hard that
    consistency is.  Hence this patch move to holding the flags on the
    template-decl-result decl.  That's the entity various bits of the
    parser have at the appropriate time.   Once needs STRIP_TEMPLATE in a
    bunch of places, which this patch adds.  Also a check that we never
    give a TEMPLATE_DECL to the module flag accessors.

    This left a problem with how I was handling template aliases.  These
    were in two parts -- separating the TEMPLATE_DECL from the TYPE_DECL.
    That seemed somewhat funky, but development showed it necessary.  Of
    course, that causes problems if the TEMPLATE_DECL cannot contain 'am
    imported' information.  Investigating now shows that we do not need to
    treat them separately.  By reverting a bit of template instantiation
    machinery that caused the problem, we're back on course.  I think what
    has happened is that between then and now, other typedef fixes have
    corrected the underlying problem this separation was working around.
    It allows a bunch of cleanup in the decl streamer, as we no longer
    have to handle a null TEMPLATE_DECL_RESULT.

            PR c++/99283
            gcc/cp/
            * cp-tree.h (DECL_MODULE_CHECK): Ban TEMPLATE_DECL.
            (SET_TYPE_TEMPLATE_INFO): Restore Alias template setting.
            * decl.c (duplicate_decls): Remove template_decl module flag
            propagation.
            * module.cc (merge_kind_name): Add alias tmpl spec as a thing.
            (dumper::impl::nested_name): Adjust for template-decl module flag
            change.
            (trees_in::assert_definition): Likewise.
            (trees_in::install_entity): Likewise.
            (trees_out::decl_value): Likewise.  Remove alias template
            separation of template and type_decl.
            (trees_in::decl_value): Likewise.
            (trees_out::key_mergeable): Likewise,
            (trees_in::key_mergeable): Likewise.
            (trees_out::decl_node): Adjust for template-decl module flag
            change.
            (depset::hash::make_dependency): Likewise.
            (get_originating_module, module_may_redeclare): Likewise.
            (set_instantiating_module, set_defining_module): Likewise.
            * name-lookup.c (name_lookup::search_adl): Likewise.
            (do_pushdecl): Likewise.
            * pt.c (build_template_decl): Likewise.
            (lookup_template_class_1): Remove special alias_template handling
            of DECL_TI_TEMPLATE.
            (tsubst_template_decl): Likewise.
            gcc/testsuite/
            * g++.dg/modules/pr99283-2_a.H: New.
            * g++.dg/modules/pr99283-2_b.H: New.
            * g++.dg/modules/pr99283-2_c.H: New.
            * g++.dg/modules/pr99283-3_a.H: New.
            * g++.dg/modules/pr99283-3_b.H: New.
            * g++.dg/modules/pr99283-4.H: New.
            * g++.dg/modules/tpl-alias-1_a.H: Adjust scans.
            * g++.dg/modules/tpl-alias-1_b.C: Adjust scans.