[Bug c++/82254] New: std::is_nothrow_invocable is broken

[bolero.murakami at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82254

            Bug ID: 82254
           Summary: std::is_nothrow_invocable is broken
           Product: gcc
           Version: 8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: bolero.murakami at gmail dot com
  Target Milestone: ---

std::is_nothrow_invocable is broken.

example:
--------------------------------
struct X {
    X(int x) { throw x; }
};
int f(int x) noexcept { return x; }
using F = decltype(f);
--------------------------------

INVOKE<X>(F, int) throws exception,
but std::is_nothrow_invocable_r_v<X, F, int> is true.
Should actually return false.

Run code(wandbox): https://wandbox.org/permlink/WDeMGw6zbAZ7pYk1