semi-automatic test case generation

[expipiplus1]

Given an existing test case:

• Split each line into haskell lexemes
• Change the whitespace willy-nilly between lexemes, maintaining
  • The indentation of the initial lexeme
  • The minimum indentation of any lexeme should be greater than the initial one (for the case when newlines are inserted before a lexeme)
  • Not more than one newline before each lexeme

This generates a new testcase which should vary in formatting from the initial one.