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From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/113389] ICE when explicit object parameter is not declared
 as the first parameter
Date: Thu, 18 Jan 2024 14:12:23 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D113389

--- Comment #2 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The trunk branch has been updated by Marek Polacek <mpolacek@gcc.gnu.org>:

https://gcc.gnu.org/g:9840e0be78150b0ef6e29975a6244698d5a5580c

commit r14-8239-g9840e0be78150b0ef6e29975a6244698d5a5580c
Author: Marek Polacek <polacek@redhat.com>
Date:   Wed Jan 17 19:16:32 2024 -0500

    c++: ICE when xobj is not the first parm [PR113389]

    In grokdeclarator/cdk_function the comment says that the find_xobj_parm
    lambda clears TREE_PURPOSE so that we can correctly detect an xobj that
    is not the first parameter.  That's all good, but we should also clear
    the TREE_PURPOSE once we've given the error, otherwise we crash later in
    check_default_argument because the 'this' TREE_PURPOSE lacks a type.

            PR c++/113389

    gcc/cp/ChangeLog:

            * decl.cc (grokdeclarator) <case cdk_function>: Set TREE_PURPOS=
E to
            NULL_TREE when emitting an error.

    gcc/testsuite/ChangeLog:

            * g++.dg/cpp23/explicit-obj-diagnostics10.C: New test.=