// Comptime type construction — channel result types: RecvResult($T) /
// TryResult($T), built ENTIRELY in sx library code as type-fns over the
// `define(declare(), ...)` primitives (no compiler machinery). A blocking recv
// yields a value or a `closed` marker; a non-blocking try-recv adds `empty` —
// three states a bool can't express. This locks that they construct and match
// like any enum, and that `RecvResult(i64)` is one nominal type across sites
// (the type-fn identity path).
#import "modules/std.sx";
#import "modules/std/meta.sx";

main :: () -> i32 {
    r := RecvResult(i64).value(42);
    if r == {
        case .value:  (v) { print("recv value {}\n", v); }
        case .closed: { print("recv closed\n"); }
    }

    rc : RecvResult(i64) = .closed;
    if rc == {
        case .value:  (v) { print("recv value {}\n", v); }
        case .closed: { print("recv closed\n"); }
    }

    t := TryResult(i64).value(7);
    if t == {
        case .value:  (v) { print("try value {}\n", v); }
        case .empty:  { print("try empty\n"); }
        case .closed: { print("try closed\n"); }
    }

    te : TryResult(i64) = .empty;
    if te == {
        case .value:  (v) { print("try value {}\n", v); }
        case .empty:  { print("try empty\n"); }
        case .closed: { print("try closed\n"); }
    }
    return 0;
}