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From: "nathanieloshead at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/113405] Can't access member type alias of
 concept-constrained class template specialization in global module fragment
 via alias template in different module
Date: Fri, 19 Jan 2024 03:38:41 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D113405

Nathaniel Shead <nathanieloshead at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |nathanieloshead at gmail d=
ot com

--- Comment #4 from Nathaniel Shead <nathanieloshead at gmail dot com> ---
The issue seems to be that 'depset::hash::add_specializations' only adds the
first of a set of constrained specialisations that use the same arguments. =
This
comes down to the fact that the 'type_specializations' hashset is only hash=
ed
on the base template and the provided arguments: differently constrained
specialisations just aren't added.

Other parts of the dependency walker seem to handle this OK, by walking the
DECL_TEMPLATE_SPECIALIZATIONS list, but not the base 'specialization_add'
function.

I'm not entirely sure yet what the best way to approach solving this is.=