// E6BR-4 (param-impl ARG, own-wins) — a parameterised-impl PROTOCOL TYPE-ARG under
// a wrapper (`impl Tagged(*Box) for Holder`) is resolved through the same
// source-aware registration helper (`resolveRegistrationSigTypeInSource` with the
// `.param_impl_arg` purpose), pinned to the impl's defining module (main). The arg
// `*Box` flows through `resolveCompound` → `resolveNominalLeaf` and selects main's
// OWN `Box { m }` rather than the flat-imported `dep.sx` `Box { a }`, so the impl
// registers and `Holder.tag` is callable. (The `param_impl_map` key is name-based,
// so own-wins registration and any later lookup agree by construction; this cell
// locks that the wrapped arg routes through the engine, not the no-author leaf.)

#import "modules/std.sx";
#import "0828-protocols-param-impl-arg-wrapped-own-wins/dep.sx";

Box :: struct { m: i32; }
Holder :: struct { n: i32; }

Tagged :: protocol(T: Type) {
    tag :: () -> i32;
}

impl Tagged(*Box) for Holder {
    tag :: (self: *Holder) -> i32 {
        self.n
    }
}

main :: () -> i32 {
    h : Holder = .{ n = 7 };
    print("tag={} dep={}\n", h.tag(), dep_box());
    0
}