Hojun-Cho
6b67655eca
`len(xs[i])` over a [N]str/[]str (and []T slice) element returned the element's .ptr, not its length, on BOTH stages (shared gap, not rule-10): the len() builtin had no N_INDEX arm, so it fell to the bare-cgexpr fallback, where the N_INDEX str/slice load (cgslicehdr) leaves AX=.ptr, BX=.len, CX=.cap — and len() returned AX (the ptr) as the length. Add an N_INDEX arm gated on a (TY_SLICE||TY_STR) element in both stages: cgexpr the element, then MOVQ BX,AX to shuffle the len word into the result reg — the same shape as the #14 .len pseudo-field fix. Byte-id neutral (no bootstrap source uses len(indexed-element)); regenerated w6c + wwdump combined.ww. New 802_lenidx_run pins runtime + cs==ww.