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//@ run-fail
//@ compile-flags: -Copt-level=3 -Cdebug-assertions=no -Zub-checks=yes
//@ error-pattern: unsafe precondition(s) violated: str::get_unchecked_mut requires
//@ revisions: range range_to range_from backwards_range
fn main() {
unsafe {
let mut s: String = "💅".chars().collect();
let mut s: &mut str = &mut s;
#[cfg(range)]
s.get_unchecked_mut(4..5);
#[cfg(range_to)]
s.get_unchecked_mut(..5);
#[cfg(range_from)]
s.get_unchecked_mut(5..);
#[cfg(backwards_range)]
s.get_unchecked_mut(1..0);
}
}
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