https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80564
--- Comment #3 from Eric Fiselier <eric at efcs dot ca> ---
Here is an example of why `_Bind::operator()(...) const` must be considered
during overload resolution even if the call wrapper itself is not const.
------------------------------
#include <functional>
struct Func {
template <class ...Args>
void operator()(Args&&...) = delete;
template <class ...Args>
void operator()(Args&&...) const {}
};
int main() {
Func f;
std::bind(f)();
}
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