rust/src/test/compile-fail/while-loop-pred-constraints.rs

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// xfail-stage0
// error-pattern: Unsatisfied precondition constraint (for example, even(y
fn print_even(int y) : even(y) {
log y;
}
pred even(int y) -> bool {
true
}
fn main() {
let int y = 42;
let int x = 1;
check even(y);
while (true) {
print_even(y);
while (true) {
while (true) {
while (true) {
y += x;
}
}
}
}
}