Implementation
Haskell

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Other implementations
import "os"
import "path/filepath"
programPath := os.Args[0]
absolutePath, err := filepath.Abs(programPath)
if err != nil {
	return err
}
dir := filepath.Dir(absolutePath)
import std.path;
void main(string[] args) {
    string dir = args[0].dirName;
}
dir := extractfilepath(paramstr(0));
$dir = realpath(dirname(__FILE__));
dir = __dir__
import System.Environment (getExecutablePath)
import System.FilePath.Windows
import System.IO.Unsafe (unsafePerformIO)
dir = unsafePerformIO (takeDirectory `fmap` getExecutablePath)
import os
dir = os.path.dirname(os.path.abspath(__file__))
let dir = ::std::env::current_dir()?;