Before: impl<T, U> UnwindSafe for (T, ...) where T: UnwindSafe, U: UnwindSafe, After: impl<T> UnwindSafe for (T, ...) where T: UnwindSafe,
Before: impl<T, U> UnwindSafe for (T, ...) where T: UnwindSafe, U: UnwindSafe, After: impl<T> UnwindSafe for (T, ...) where T: UnwindSafe,