// `lib.sx` imports `dep.sx`, so `Needs` is bare-visible HERE. A module that
// imports only `lib.sx` cannot see `Needs` (non-transitive). The pack fn's
// fixed-prefix param `n: Needs` must therefore resolve in this module's
// context, not the caller's.
#import "modules/std.sx";
#import "dep.sx";

make :: () -> Needs => Needs.{ v = 7 };

// Control: a plain (non-pack) fn with the same fixed param already resolves in
// its defining module — the cross-module call-arg typing path is source-pinned.
use_plain :: (n: Needs) -> s64 => n.v;

// Pack fn: the fixed-prefix param `n: Needs` is bound during pack
// monomorphization. Its type must resolve under this module's source.
use_pack :: (n: Needs, ..$args) -> s64 => n.v + args[0];