// Module B authors a DIFFERENT same-name `K :: 7` and same-name struct `Box`.
// `size_of(Box)` folds the field dimension against B's `K` (= 7), so the layout
// differs from A's — never collapsed to a global last-wins `K`.
K :: 7;
Box :: struct { arr: [K]u8; }
b_sz :: () -> s64 { return size_of(Box); }