https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93895
--- Comment #1 from Eric Niebler <eric.niebler at gmail dot com> --- Here is the error: repro.cpp.i: In instantiation of ‘bool bf::{anonymous}::bb<int, chunk_view_<debug_input_view<int>, false> >’: repro.cpp.i:158:67: required from ‘df<dd, de>::operator Container() [with Container = view_facade<chunk_view_<debug_input_view<int>, false>::outer_cursor::inner_view, bh>; bool dk = true; dd = chunk_view_<debug_input_view<int>, false>; bg de = bh]’ repro.cpp.i:206:1: required from ‘chunk_view_<cd, false>::outer_cursor::inner_view chunk_view_<cd, false>::outer_cursor::q() [with cd = debug_input_view<int>]’ repro.cpp.i:102:5: required from ‘auto ci::q(ck) [with ck = chunk_view_<debug_input_view<int>, false>::outer_cursor]’ repro.cpp.i:123:6: required from ‘auto cf<ck>::operator*() [with ck = chunk_view_<debug_input_view<int>, false>::outer_cursor]’ repro.cpp.i:57:1: required from ‘void cm::is_iterator(bw) requires t<bw> [with bw = cf<chunk_view_<debug_input_view<int>, false>::outer_cursor>]’ repro.cpp.i:129:12: required from ‘auto cm::cp::operator()(bx) requires co<bx> [with bx = chunk_view<debug_input_view<int> >]’ repro.cpp.i:148:49: required from here repro.cpp.i:40:50: internal compiler error: Segmentation fault: 11 40 | template <typename ah, typename... an> bool bb = __is_constructible(ah, an...); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~