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$ prog.cc: In instantiation of 'class FixPoint<main()::<lambda(auto:11, int)>&>':
prog.cc:29:40: required from 'constexpr decltype(auto) {anonymous}::makeFixPoint(F&&) [with F = main()::<lambda(auto:11, int)>&]'
prog.cc:40:34: required from here
prog.cc:7:1: error: base type 'main()::<lambda(auto:11, int)>&' fails to be a struct or class type
7 | FixPoint : private F
| ^~~~~~~~
prog.cc: In instantiation of 'constexpr decltype(auto) FixPoint<F>::operator()(Args&& ...) const [with Args = {int}; F = main()::<lambda(auto:11, int)>&]':
prog.cc:40:38: required from here
prog.cc:18:25: error: 'operator()' is not a member of 'main()::<lambda(auto:11, int)>&'
18 | return F::operator()(*this, std::forward<Args>(args)...);
| ~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
prog.cc: In instantiation of 'constexpr FixPoint<F>::FixPoint(F&&) [with F = main()::<lambda(auto:11, int)>&]':
prog.cc:29:40: required from 'constexpr decltype(auto) {anonymous}::makeFixPoint(F&&) [with F = main()::<lambda(auto:11, int)>&]'
prog.cc:40:34: required from here
prog.cc:11:27: error: type 'main()::<lambda(auto:11, int)>&' is not a direct base of 'FixPoint<main()::<lambda(auto:11, int)>&>'
11 | : F{std::forward<F>(f)}
| ^
Exit Code:
1