// Call-site default-argument expansion (`appendDefaultArgs` / `expandCallDefaults`
// in lowerCall). A call that omits a trailing parameter with a default value
// has the default expression spliced in at the call site; an explicit argument
// overrides it. Two trailing defaults cover the "fill all remaining" path.
// Path-free IR (literal defaults) so the `.ir` snapshot is location-stable.

#import "modules/std.sx";

scale :: (n: i32, factor: i32 = 2) -> i32 { n * factor }

label :: (n: i32, prefix: string = "v", suffix: string = "!") -> i32 {
    print("{}{}{}\n", prefix, n, suffix);
    n
}

main :: () {
    print("default: {}\n", scale(5));
    print("explicit: {}\n", scale(5, 3));

    _ = label(1);                 // both defaults filled
    _ = label(2, "x");            // suffix default filled
    _ = label(3, "y", "?");       // no defaults
}