[Bug libstdc++/80172] New: Segfault when using a constructed intializer list of tuple(int, variant) created through template pack expansion

[gcc-bugs at marehr dot dialup.fu-berlin.de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80172

            Bug ID: 80172
           Summary: Segfault when using a constructed intializer list of
                    tuple(int, variant) created through template pack
                    expansion
           Product: gcc
           Version: 7.0.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libstdc++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: gcc-bugs at marehr dot dialup.fu-berlin.de
  Target Milestone: ---

Created attachment 41044
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=41044&action=edit
example source code that triggers segfault

Hi gcc-team,

the attached source code compiles, but will terminate with a segfault when
executed.

> g++-7 -std=gnu++1z -Wall -Wextra 
> bug_gcc_tuple_of_variant_in_pack_expansion.cpp
> ./a.out
0. 4
1. 5
2. 1
A
N
-
0. A
1. N
2. -
zsh: segmentation fault (core dumped)  ./a.out

best regards
marehr