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From: "anlauf at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/107576] [10/11/12/13 Regression] ICE in
 gfc_conv_procedure_call, at fortran/trans-expr.cc:6193
Date: Mon, 14 Nov 2022 20:46:35 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107576

--- Comment #8 from anlauf at gcc dot gnu.org ---
(In reply to G. Steinmetz from comment #7)
> $ gfortran -c z3.f90
> z3.f90:2:10:
>=20
>     2 |    call s(null())
>       |          1
> Error: MOLD argument to NULL required at (1)

I think that error message might be fine.  It seems to be related to
16.9.144 NULL() and table 16.5: Characteristics of the result of NULL ( ).

This is why z3c/z2i give no error: there is an explicit interface,
and 16.9.144(5) explains how this is resolved.

With gfortran -fallow-argument-mismatch, we have the bad situation that the
user explicitly wants to leave the space of standard conformance, and we are
entering extension space, with all its problems...=