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From: "ppalka at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/105297] [12 Regression] new modules 'xtreme' test cases 
 FAILs
Date: Wed, 20 Apr 2022 17:59:18 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D105297

--- Comment #10 from Patrick Palka <ppalka at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #9)
> (In reply to Patrick Palka from comment #7)
> > (In reply to Jonathan Wakely from comment #6)
> > > Patrick, I suggest we go with Jakub's suggestion in comment 4, but PT=
AL.
> >=20
> > LGTM, it seems to be the simplest workaround.  I also tried replacing t=
he
> > NSDMI but that seems to prevent the ICE only for the reduced testcase in
> > comment #3.
>=20
> Note, the original reduced testcase didn't have the " S" part in there,
> i.e. used anonymous struct.  Is that what matters for the NSDMI?

Interestingly that doesn't seem to make a difference.  What seems to matter=
 is
whether the constexpr function modifies the CONSTRUCTOR that it returns:

constexpr auto foo() {
  struct S { int d; } t =3D {};
  t.d =3D 0; // doesn't ICE if this line is commented out
  return t;
}

template<int>
int bar() {
  constexpr auto t =3D foo();
  return 0;
}=