[Bug c++/111890] ICE in tsubst_friend_function with friend function declared inside a concept constrainted class inside a template class

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111890

--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Full backtrace:
```
t1.cc:8:18: internal compiler error: Segmentation fault
    8 |     friend  auto operator+(const Iterator &it, int) {}
      |                  ^~~~~~~~
0x12dabdf crash_signal
        /home/apinski/src/upstream-gcc-git/gcc/gcc/toplev.cc:314
0x7f6489454def ???
       
/usr/src/debug/glibc-2.34-60.el9.x86_64/signal/../sysdeps/unix/sysv/linux/x86_64/libc_sigaction.c:0
0xc4156c tree_check(tree_node*, char const*, int, char const*, tree_code)
        /home/apinski/src/upstream-gcc-git/gcc/gcc/tree.h:3595
0xc4156c tsubst_friend_function
        /home/apinski/src/upstream-gcc-git/gcc/gcc/cp/pt.cc:11351
0xc42536 instantiate_class_template(tree_node*)
        /home/apinski/src/upstream-gcc-git/gcc/gcc/cp/pt.cc:12543
0xc95550 complete_type(tree_node*)
        /home/apinski/src/upstream-gcc-git/gcc/gcc/cp/typeck.cc:138
0xaaee4b start_decl_1(tree_node*, bool)
        /home/apinski/src/upstream-gcc-git/gcc/gcc/cp/decl.cc:6009
0xaaee4b start_decl_1(tree_node*, bool)
        /home/apinski/src/upstream-gcc-git/gcc/gcc/cp/decl.cc:5988
0xacee2f start_decl(cp_declarator const*, cp_decl_specifier_seq*, int,
tree_node*, tree_node*, tree_node**)
        /home/apinski/src/upstream-gcc-git/gcc/gcc/cp/decl.cc:5975
0xbda5c5 cp_parser_init_declarator
        /home/apinski/src/upstream-gcc-git/gcc/gcc/cp/parser.cc:23135
0xbaddd8 cp_parser_simple_declaration
        /home/apinski/src/upstream-gcc-git/gcc/gcc/cp/parser.cc:15621
0xbe5b71 cp_parser_declaration
        /home/apinski/src/upstream-gcc-git/gcc/gcc/cp/parser.cc:15307
0xbe6a42 cp_parser_toplevel_declaration
        /home/apinski/src/upstream-gcc-git/gcc/gcc/cp/parser.cc:15328
0xbe6a42 cp_parser_translation_unit
        /home/apinski/src/upstream-gcc-git/gcc/gcc/cp/parser.cc:5192
0xbe6a42 c_parse_file()
        /home/apinski/src/upstream-gcc-git/gcc/gcc/cp/parser.cc:50534
0xd2c621 c_common_parse_file()
        /home/apinski/src/upstream-gcc-git/gcc/gcc/c-family/c-opts.cc:1278
Please submit a full bug report, with preprocessed source (by using
-freport-bug).
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.

```