rust/src/test/run-pass/borrowck-preserve-box-sometimes-needed.rs

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// exec-env:RUST_POISON_ON_FREE=1
fn switcher(x: option<@int>) {
let mut x = x;
alt x {
some(@y) { copy y; x = none; }
none { }
}
}
fn main() {
switcher(none);
switcher(some(@3));
}