B_AT_TUPLE
| '(' vargs ',' expr ')'{ $$ = ba_new(ba_append($2, $4), B_AT_TUPLE); }
if (mkey->ba_type == B_AT_TUPLE)
case B_AT_TUPLE:
case B_AT_TUPLE:
ba = ba_new(bh, B_AT_TUPLE);
case B_AT_TUPLE:
assert(ba->ba_type == B_AT_TUPLE);
assert(ba->ba_type != B_AT_TUPLE);
else if (ba->ba_type == B_AT_TUPLE) {
case B_AT_TUPLE: