Hojun-Cho
999b110001
The TODO(#11) silent-accept of `for (let (a, a) .. xs)` rested on a stale premise -- resolvewalk has per-block scopes since #53 and IS the live w6c_ww checker pass. Bindings now install in a per-LOOP scope (the N_MCASE pattern), so a duplicate name within one pattern errs "redeclared in same scope" (cstage parity via stamptuplebinds' scopedefine-nil check) while sequential same-name loops stay legal. kwtab restores its stated alphabetical order (`import` before `is`, both stages, kinds swapped in lockstep with names).