CONCAT
%left CONCAT
| expr CONCAT expr {
$$ = node(CONCAT, $1, $3);
%token <node> PARM ARRAY UFUNC FIELD IN INDEX CONCAT
c = CONCAT;
c = CONCAT;
c = CONCAT;
case CONCAT:
if (lnp->n_type == CONCAT) {
%left CONCAT.
expr(A) ::= expr(X) CONCAT expr(Y). {A = sqliteExpr(TK_CONCAT, X, Y, 0);}