Memory leak in `CountOccurences` snippet in Mathematics category

[delphidabbler]

The following code in the private SortResult function of CountOccurences causes a memory leak:

  procedure SortResult(
    var A: array of Generics.Collections.TPair<Integer,Cardinal>);
  begin
    Generics.Collections.TArray.Sort<
      Generics.Collections.TPair<Integer,Cardinal>
    >(
      A,
      Generics.Defaults.TDelegatedComparer<
        Generics.Collections.TPair<Integer,Cardinal>
      >.Create(
        function (
          const Left, Right: Generics.Collections.TPair<Integer,Cardinal>):
          Integer
        begin
          Result := Left.Key - Right.Key;
        end
      )
    );
  end;

The fix is to create the comparer outside the method call:

  procedure SortResult(
    var A: array of Generics.Collections.TPair<Integer,Cardinal>);
  var
    Comparer: Generics.Defaults.IComparer<
      Generics.Collections.TPair<Integer,Cardinal>
    >;
  begin
    Comparer := Generics.Defaults.TDelegatedComparer<
        Generics.Collections.TPair<Integer,Cardinal>
      >.Create(
        function (
          const Left, Right: Generics.Collections.TPair<Integer,Cardinal>):
          Integer
        begin
          Result := Left.Key - Right.Key;
        end
      );
    Generics.Collections.TArray.Sort<
      Generics.Collections.TPair<Integer,Cardinal>
    >(A, Comparer);
  end;

[delphidabbler]

Implemented at commit d5a2efb