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Subject: [Bug c++/95870] [9 Regression] ICE (segmentation fault) in
 most_general_template(), in gcc/cp/pt.c
Date: Fri, 13 May 2022 17:41:13 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D95870

--- Comment #14 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-9 branch has been updated by Jason Merrill
<jason@gcc.gnu.org>:

https://gcc.gnu.org/g:cf475f6e23581b1766e508dba81171de8f81b180

commit r9-10166-gcf475f6e23581b1766e508dba81171de8f81b180
Author: Jason Merrill <jason@redhat.com>
Date:   Mon Apr 5 11:34:48 2021 -0400

    c++: lambda in DMI in class template [PR95870]

    Here enclosing_instantiation_of was failing to find a match because otc=
tx
is
    struct S<T> and current_function_decl is S<int>::S(), so the latter has
more
    function contexts, and we end up trying to compare S() to NULL_TREE.

    After spending a bit of time working on establishing the correspondence=
 in
    this case (class <=3D> constructor), it occurred to me that we could ju=
st use
    DECL_SOURCE_LOCATION, which is unique for lambdas, since they cannot be
    redeclared.  Since we're so close to release, for now I'm only doing th=
is
    for the case that was failing before.

    gcc/cp/ChangeLog:

            PR c++/95870
            * pt.c (enclosing_instantiation_of): Compare DECL_SOURCE_LOCATI=
ON
if
            there is no enclosing non-lambda function.

    gcc/testsuite/ChangeLog:

            PR c++/95870
            * g++.dg/cpp0x/lambda/lambda-nsdmi10.C: New test.=