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Instead of changing the code of the snippet, consider creating another Pascal implementation.

Other implementations
import "io/ioutil"
dir, err := ioutil.TempDir("", "")
string mkTmpDir()
    import std.uuid, std.file, std.path;
    string d = buildPath(tempDir, randomUUID.toString);
    if (!d.exists)
        return d;
    else return null;

string s;
while (!s.length)
  s = mkTmpDir;
require 'tmpdir' 
td = Dir.mktmpdir
import tempfile	
td = tempfile.TemporaryDirectory()
extern crate tempdir;
use tempdir::TempDir;
let tmp = TempDir::new("prefix")?;
function createTempDir(): ?string
    $path = rtrim(sys_get_temp_dir(), DIRECTORY_SEPARATOR) . DIRECTORY_SEPARATOR . mt_rand() . microtime(true);
    if (mkdir($path)) {
        return $path;
    return null;
import System.IO.Temp
withTempDirectory $ \d -> do
  -- do something with d
use Path::Tiny qw(tempdir);
my $path = tempdir;
using System.IO;
string newDir = Path.GetTempPath() + Guid.NewGuid();