Hojun-Cho
351abb0ab3
Reading or writing a tagged field of an indexed array element (xs[i].field) was broken on BOTH stages, byte-identically and silently (#263 gate-blind): the arr[i].field branches had arms for array/str/slice/float but no TY_TAGGED arm, so the tagged field fell to the single-word scalar path. READ loaded only the tag word (stale payload -> `xs[i].min as T` read garbage); ASSIGN stored the raw unboxed scalar into the tag slot, corrupting the box. Insert a TY_TAGGED cursor arm before each scalar fallback, both sites both stages (cgen.c read + assign; cgenexpr.ww cgdot N_INDEX-lhs read + cgassign indexed-field). READ mirrors cg_tagged_memread (payload -> DX/CX/R8, tag -> AX last). ASSIGN synthesizes the tag for the concrete variant (taggedvariantindext) and stores tag+payload via the str/slice 3-word store spine -- not the source-remap widener (concrete rhs has no source tag to remap). >32B / multi-word / float payloads are loud-stopped at all four arms (emission not yet wired; see #114). That shape is reachable today via a narrow-variant ctor, so it louds rather than silently miscompiling. Both stages get the same arm -> byte-id preserved (990-997 green; the runtime is the net for this #263 class). Pin 944_idx_tagged_field_run (read/assign runtime rows + >32B expect-loud rows).