EQNPOS_SQRT
cur->pos == EQNPOS_SQRT ||
parent->pos = EQNPOS_SQRT;
case EQNPOS_SQRT:
if (bp->pos == EQNPOS_SQRT) {
(bp->parent != NULL && (bp->parent->pos == EQNPOS_SQRT ||
(bp->type == EQN_SUBEXPR && bp->pos != EQNPOS_SQRT &&
bp->pos != EQNPOS_SQRT)))))) {