Probe-first find for the path c2 appendlit (buf.buf[lo..hi]=bs): a slice-copy-assign into a struct-field array sub-range emitted ZERO code — silent NO-OP, both stages, both-wrong-identical (#263), so runtime is the only net. N_ASSIGN gains an N_SLICE-LHS arm (cgen.c + cgenexpr.ww slicebaseesz twin) reusing the N_SLICE-read base/esz cascade and copying (hi-lo)*esz bytes from rhs.ptr via a runtime loop (len is runtime; no REP/MOVSB). esz routed through the type table (rule 13; [N]u8->1). Hare len(bs)==hi-lo assert deferred to #149.