// any_to_string didn't handle optionals. A struct field of type `?T`
// printed as `<?>` (any_to_string's "no case matched" default)
// because there was no `case optional:` arm, and no dispatch table
// entry mapping `?T` TypeIds to the optional category.
//
// The variadic auto-unwrap path (packVariadicCallArgs) papered over
// this for direct `print("{}\n", opt)` calls — it stringified
// optionals to either the inner value's repr or `"null"` BEFORE
// boxing as Any. But anywhere else that boxes an optional and reads
// it back through any_to_string (struct field printing,
// `xx opt : Any`, future user code) hit the `<?>` floor.
//
// Locks in the fix: each ?T variant routes through `case optional:`
// → `optional_to_string(cast(type) val)` → either the inner value's
// `any_to_string` representation or the literal `"null"`.

#import "modules/std.sx";

S :: struct {
    a: ?i64;
    b: ?string;
    c: ?bool;
}

main :: () {
    filled := S.{ a = 42, b = "hi", c = true };
    print("{}\n", filled);
    empty := S.{ a = null, b = null, c = null };
    print("{}\n", empty);
    0;
}