rust/src/test/compile-fail/tstate-while-break.rs

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pure fn is_even(i: int) -> bool { (i%2) == 0 }
fn even(i: int) : is_even(i) -> int { i }
fn test(cond: bool) {
let v = 4;
while cond {
check is_even(v);
break;
}
even(v); //! ERROR unsatisfied precondition
}
fn main() {
test(true);
}