[Bug c++/105398] [11/12 Regression][ICE] enum in array in lambda

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105398

--- Comment #7 from CVS 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:409edcca331296b53842c50d3b789e1b1ccc05e5

commit r12-8290-g409edcca331296b53842c50d3b789e1b1ccc05e5
Author: Marek Polacek <polacek@redhat.com>
Date:   Tue Apr 26 16:12:58 2022 -0400

    c++: enum in generic lambda at global scope [PR105398]

    We crash compiling this test since r11-7993 which changed
    lookup_template_class_1 so that we only call tsubst_enum when

      !uses_template_parms (current_nonlambda_scope ())

    But here current_nonlambda_scope () is the global NAMESPACE_DECL ::, which
    doesn't have a type, therefore is considered type-dependent.  So we don't
    call tsubst_enum, and crash in tsubst_copy/CONST_DECL because we didn't
    find the e1 enumerator.

    I don't think any namespace can depend on any template parameter, so
    this patch tweaks uses_template_parms.

            PR c++/105398

    gcc/cp/ChangeLog:

            * pt.cc (uses_template_parms): Return false for any NAMESPACE_DECL.

    gcc/testsuite/ChangeLog:

            * g++.dg/cpp1y/lambda-generic-enum2.C: New test.