rust/tests/ui/nll/match-cfg-fake-edges2.rs
2024-04-03 21:02:47 +02:00

26 lines
760 B
Rust

// Test that we have enough false edges to avoid exposing the exact matching
// algorithm in borrow checking.
fn all_previous_tests_may_be_done(y: &mut (bool, bool)) {
let r = &mut y.1;
// We don't actually test y.1 to select the second arm, but we don't want
// borrowck results to be based on the order we match patterns.
match y {
//~^ ERROR cannot use `y.1` because it was mutably borrowed
(false, true) => {}
// Borrowck must not know we don't test `y.1` when `y.0` is `true`.
(true, _) => drop(r),
(false, _) => {}
};
// Fine in the other order.
let r = &mut y.1;
match y {
(true, _) => drop(r),
(false, true) => {}
(false, _) => {}
};
}
fn main() {}