anchor.diff:  
       // It's just so much faster
       // to use mutable values 
  -    // then creating a new T
  +    // then creating a new State
       // object for each token consumed
       mutable Token : Token
       mutable EndExpression : bool
  
positive.code:     member x.TokenColumn = 
        let _, _, _, c = x.Token in c
      #endif
  
    (*
      Creates a string error snippet 
  
negative.code: 
  module Parser =
  
  
    type State = {
      Env : Env
  