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From: "ppalka at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/105481] [9/10/11/12/13 Regression] ICE: unexpected
 expression of kind template_parm_index
Date: Thu, 05 May 2022 12:32:25 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D105481

--- Comment #5 from Patrick Palka <ppalka at gcc dot gnu.org> ---
Here's a closely related rejects-valid (rather than ICE-on-valid) testcase,
where the default argument is now T instead of uint<N> (which shouldn't aff=
ect
the outcome of partial ordering):

template<unsigned> struct uint;
template<unsigned N> uint<N> f(const uint<N> &);             // #1
template<unsigned N, typename T, typename =3D T> uint<N> f(T); // #2
using X =3D uint<1>;
X (*fp)(X const &) =3D f; // should use #1, instead diagnoses as ambiguous=