Hojun-Cho
6f18f42a4a
The array-of-struct element store/copy family — one primitive (&(array element) for an AGGREGATE element, used as address, never deref/truncate) across three consumers. Both stages were symmetric-broken; converge on the runtime-correct full-address/full-copy (#263). (1a) `a[i].m[j] = v` (a:[N]struct) segfaulted: the `arr[i].field` arm computed &a[i] then DEREF'd it (loaded the struct's first 8 bytes as a value) for an `[N]T`-typed field → garbage base. Now an array-typed field of an array element leaves the field ADDRESS (the #135 read-side, applied to the array-element base). cgen.c arm + cgenexpr.ww cgdot N_INDEX-lhs branch. (1b) `a[i] = aggregateval` truncated the copy to an 8B MOVQ. New aggregate (struct/array/tuple >8B) element-store branch word-copies the element from the rhs source address (ident / N_DOT field / `*p` deref) — the WRITE-twin of the #268 let-init loop. cgen.c N_INDEX store + cgenexpr.ww cgassign. (3a) `let c = x.arr[i]` (N_DOT base) / `let c = a[i][j]` (nested) dropped the copy: the #268 let-init N_INDEX source-addr arm was N_IDENT-base- gated. Now computes &base[idx] via cg_dotbase_addr (N_DOT field) or the &abase[bidx] spine (nested N_IDENT-array base). cgen.c N_LET + cgenstmt.ww cglet. 949 rows: elemfield_store, elem_struct_store, elem_arr_store, letcopy_{dot,nest}_prim, letcopy_subarr (byteid=1); letcopy_{dot,nest}_ struct (byteid=0 — run-correct, byte-id blocked by the orthogonal value-nested-struct frame divergence #254). All 94 pass; test-unit 241 green.