old_contents: from parglare import Grammar
  
  
  grammar = Grammar.from_string("""
      start: ab EOF;
      ab: "a" ab "b" | EMPTY;
  """)
  
  start_symbol = 'start'
  
new_contents: from parglare import Grammar
  
  
  grammar = Grammar.from_string("""
      start: ab;
      ab: "a" ab "b" | EMPTY;
  """)
  
  start_symbol = 'start'
  
subject: Remove `EOF` -- update examples