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