Hojun-Cho
ed94467a0c
708 pinned param + clet + self-import-skip after #19 landed; the other 4 sites where check_module_shadow is wired (N_MLET, N_FORRANGE single, N_FORRANGE tuple, N_MCASE) had no dedicated negative-compile row. Worker-19's note that all 6 sites use identical call shape is true today but unpinned by tests; a future asymmetric edit could silently disable enforcement on one site. Adds neg_mlet (let-tuple binder shadows), neg_forrange_single (`for shadowmod of ...`), neg_forrange_tuple (`for (shadowmod, x) of pairs`), neg_mcase (`case let shadowmod:`). Each errors at the binder decl line with the canonical "<kind> '<name>' shadows imported module '<name>'" message. 708's main now runs 8/8 (param, let, mlet, forrange_single, forrange_tuple, mcase, pos_rename, pos_selfimp).