[Bug c++/97103] ICE on nested requires expression template template instantiation

[mateusz.pusz at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97103

--- Comment #1 from Mateusz Pusz <mateusz.pusz at gmail dot com> ---
<source>: In instantiation of 'constexpr const bool
valid_template_arguments<template<class R, class Rep> class quantity>':

<source>:8:15:   required from here

<source>:6:32: internal compiler error: in tsubst, at cp/pt.c:15447

    6 |   requires requires { typename Q<int, int>; };                      //
two representation types

      |                       ~~~~~~~~~^~~~~~~~~~~~

0x1b755e9 internal_error(char const*, ...)

        ???:0

0x686d2b fancy_abort(char const*, int, char const*)

        ???:0

0x896a1b tsubst(tree_node*, tree_node*, int, tree_node*)

        ???:0

0x709a42 tsubst_requires_expr(tree_node*, tree_node*, int, tree_node*)

        ???:0

0x709725 tsubst_requires_expr(tree_node*, tree_node*, int, tree_node*)

        ???:0

0x89ac2f instantiate_decl(tree_node*, bool, bool)

        ???:0

0x79044e maybe_instantiate_decl(tree_node*)

        ???:0

0x7935e8 mark_used(tree_node*, int)

        ???:0

0x90bab7 finish_id_expression(tree_node*, tree_node*, tree_node*, cp_id_kind*,
bool, bool, bool*, bool, bool, bool, bool, char const**, unsigned int)

        ???:0

0x862cec c_parse_file()

        ???:0

0x9d3702 c_common_parse_file()

        ???:0

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Compiler returned: 1