>>>
#!/usr/bin/env dart

import 'dart:io';
// More code...
<<<
#!/usr/bin/env dart

import 'dart:io';
// More code...
>>>
#!/usr/bin/env dart

void main() {}
<<<
#!/usr/bin/env dart

void main() {}
>>>
#!/usr/bin/env dart

/// dartdoc comment.
<<<
#!/usr/bin/env dart

/// dartdoc comment.
>>>
#!/usr/bin/env dart

var someGlobal = 0;
<<<
#!/usr/bin/env dart

var someGlobal = 0;
>>>
#!/usr/bin/env dart
import 'dart:io';
<<<
#!/usr/bin/env dart

import 'dart:io';
>>>
#!/usr/bin/env dart
// Normal comment.
<<<
#!/usr/bin/env dart

// Normal comment.