// Empty parens `()` as a return type mean `void`: `f :: () -> () { … }` is
// exactly `f :: () -> void { … }`. The zero-parameter FUNCTION type `() -> R`
// (a callable taking no args) is unaffected — only an empty `()` in the
// return-TYPE slot folds to void.
#import "modules/std.sx";

// `-> ()` is void: no value returned.
greet :: () -> () { print("hi\n"); }

// A `-> void` spelling, for contrast — identical behavior.
greet2 :: () -> void { print("bye\n"); }

// Zero-param function-typed parameter still parses as a callable, not void.
run :: (f: () -> i64) -> i64 { return f(); }

main :: () -> i64 {
    greet();
    greet2();
    print("{}\n", run(() => 7));
    return 0;
}