// Backtick raw identifier as the error-tag binding of `catch` and `onfail`. A
// reserved type-name spelling (`i2`, `u8`) is a value name when backticked, so
// it is accepted as the tag binding and a later reference resolves to it. A
// *bare* reserved spelling in the same position is still rejected (see
// examples/1123), so the backtick escape is the only way to spell these tags.
// Regression (issue 0089 — attempt-2 catch/onfail coverage).
#import "modules/std.sx";

E :: error { Bad, Empty }

parse :: (n: i32) -> (i32, !E) {
    if n < 0  { raise error.Bad; }
    if n == 0 { raise error.Empty; }
    return n * 2;
}

// `catch` tag binding spelled `i2`, referenced in the match body.
classify :: (n: i32) -> i32 {
    return parse(n) catch (`i2) == {
        case .Bad:   1;
        case .Empty: 2;
        else:        3
    };
}

// `onfail` tag binding spelled `u8`, referenced in the cleanup body.
cleanup :: (n: i32) -> !E {
    onfail (`u8) { if `u8 == error.Bad { print("cleanup: bad\n"); } }
    if n < 0 { raise error.Bad; }
    return;
}

main :: () -> i32 {
    print("classify(-1) = {}\n", classify(-1));
    print("classify(0)  = {}\n", classify(0));
    print("classify(5)  = {}\n", classify(5));
    c := cleanup(-1);
    print("done\n");
    return 0;
}