rust/src/test/run-pass/expr-alt-fail-all.rs

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// When all branches of an alt expression result in fail, the entire
// alt expression results in fail.
fn main() {
auto x = alt (true) {
case (true) {
10
}
case (true) {
alt (true) {
case (true) {
fail
}
case (false) {
fail
}
}
}
};
}