1 // This is testing an attempt to corrupt the discriminant of the match
2 // arm in a guard, followed by an attempt to continue matching on that
3 // corrupted discriminant in the remaining match arms.
5 // Basically this is testing that our new NLL feature of emitting a
6 // fake read on each match arm is catching cases like this.
8 // This case is interesting because it includes a guard that
9 // diverges, and therefore a single final fake-read at the very end
10 // after the final match arm would not suffice.
15 let mut x = &mut Some(&2);
16 let force_fn_once = ForceFnOnce;
18 &mut None => panic!("unreachable"),
20 // ForceFnOnce needed to exploit #27282
21 (|| { *x = None; drop(force_fn_once); })();
22 //~^ ERROR cannot mutably borrow `x` in match guard [E0510]
25 &mut Some(&a) if { // this binds to garbage if we've corrupted discriminant
29 _ => panic!("unreachable"),