Programmer - How read a file into a seq of lines in F#

Programmer Question

This is C# version:

public static IEnumerable<string> ReadLinesEnumerable(string path) {
  using ( var reader = new StreamReader(path) ) {
    var line = reader.ReadLine();
    while ( line != null ) {
      yield return line;
      line = reader.ReadLine();
    }
  }
}

But directly translating needs a mutable variable.

Find the answer here