test/tint/switch/switch_nested.wgsl

@compute @workgroup_size(1)
fn a() {
    var a = 0;
    switch(a) {
        case 0, 2, 4: {
            var b = 3u;
            switch(b) {
                case 0: {
                    break;
                }
                case 1, 2, 3, default: {
                    var c = 123u;
                    switch(c) {
                        case 0: {
                            break;
                        }
                        default: {
                            return;
                        }
                    }
                    return;
                }
            }
            break;
        }
        case 1, default: {
            return;
        }
    }
}