protected function parseExpr_ShellExec(Expr\ShellExec $expr)
{
$this->block->children[] = $arg = new Op\Expr\ConcatList($this->parseExprList($expr->parts, self::MODE_READ), $this->mapAttributes($expr));
return new Op\Expr\FuncCall(new Operand\Literal('shell_exec'), [$arg->result], $this->mapAttributes($expr));
}