expr_unary
$$ = expr_unary(ITM_EXPR_IN_VECTOR, $3);
$$ = expr_unary(ITM_EXPR_IN_EQ, $3);
$$ = expr_unary(ITM_EXPR_IN_EQ, $1);
$$ = expr_unary(ITM_EXPR_NOT, $2);
$$ = expr_unary(ITM_EXPR_NEG, $2);
$$ = expr_unary(ITM_EXPR_UMINUS, $2);
itm_expr_t *expr_unary(itm_expr_type_t, itm_expr_t *);