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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/106856] [12/13 Regression][OOP] CLASS attribute
 handling / ICE in gfc_conv_expr_present, at fortran/trans-expr.cc:1977 since
 r12-4346-geb92cd57a1ebe7cd
Date: Wed, 01 Mar 2023 21:36:48 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106856

--- Comment #4 from anlauf at gcc dot gnu.org ---
Created attachment 54567
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D54567&action=3Dedit
Updated patch

The original patches started to bit-rot, so here is an updated version.

The current situation is as follows:

- it fixes a couple of ice-on-valid, ice-on-invalid, rejects-valid cases,
  see below

- testcase interface_41.f90 turns out to be actually valid Fortran and is
  now correctly accepted (-> testsuite needs adjustment)

- testcase pr69398.f90 ICE's - as expected, see comment in new testcase
  class_75.f90.  Shall we mark this one as XFAIL for the time being and
  reopen pr69398?

- it appears that the following PRs are addressed or fixed with this patch:
  pr53951, pr101101, pr104229, pr107380

So applying the patch would be a big achievement over the current situation.

@Thomas: do you think this path should/could be followed?=