rust/src/test/compile-fail/borrowck-pat-reassign-sometimes-binding.rs

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// xfail-pretty -- comments are infaithfully preserved
fn main() {
let mut x = none;
alt x { //~ NOTE loan of mutable local variable granted here
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none => {
// It is ok to reassign x here, because there is in
// fact no outstanding loan of x!
x = some(0);
}
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some(i) => {
x = some(1); //~ ERROR assigning to mutable local variable prohibited due to outstanding loan
}
}
copy x; // just to prevent liveness warnings
}