rust/tests/mir-opt/early_otherwise_branch_noopt.rs

//@ test-mir-pass: EarlyOtherwiseBranch
//@ compile-flags: -Zmir-enable-passes=+UnreachableEnumBranching

// must not optimize as it does not follow the pattern of
// left and right hand side being the same variant

// EMIT_MIR early_otherwise_branch_noopt.noopt1.EarlyOtherwiseBranch.diff
fn noopt1(x: Option<u32>, y: Option<u32>) -> u32 {
    // CHECK-LABEL: fn noopt1(
    // CHECK: bb0: {
    // CHECK: [[LOCAL1:_.*]] = discriminant({{.*}});
    // CHECK-NOT: Ne
    // CHECK-NOT: discriminant
    // CHECK: switchInt(move [[LOCAL1]]) -> [
    // CHECK-NEXT: }
    match (x, y) {
        (Some(a), Some(b)) => 0,
        (Some(a), None) => 1,
        (None, Some(b)) => 2,
        (None, None) => 3,
    }
}

fn main() {
    noopt1(None, Some(0));
}