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From: "jason at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/98990] [10/11 Regression] ICE when two overloaded functions
 return `auto &&` and one accepts an `auto` parameter since
 r10-6571-ga6ee556c7659877b
Date: Mon, 08 Feb 2021 21:11:05 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98990

Jason Merrill <jason at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |NEW
           Assignee|jason at gcc dot gnu.org           |unassigned at gcc d=
ot gnu.org

--- Comment #3 from Jason Merrill <jason at gcc dot gnu.org> ---
(In reply to Martin Li=C5=A1ka from comment #2)
> With -fchecking, it started with a6ee556c7659877b.

i.e. r10-6571

The problem is that splice_late_return_type is changing the TREE_TYPE of a
REFERENCE_TYPE without also updating its TYPE_CANONICAL, which breaks; we n=
eed
to rebuild the type instead.  I expect that tsubst would do the trick, as in
do_auto_deduction.  Want to take this, Patrick?=