anchor.diff:  %  '{' '}' '&' '^' '||' '|' '||='
     .
   
  -Rootsymbol Program.
  +Rootsymbol Grammar.
   
  -%% Number
  -Number -> float : '$1'.
  -Number -> integer : '$1'.
  -
  -%% Primary Expressions 
  -PrimaryExpression -> SimpleExpression : '$1'.
  -SimpleExpression -> nil : '$1'.
  -SimpleExpression -> true : '$1'.
  -SimpleExpression -> false : '$1'.
  -SimpleExpression -> Number : '$1'.
  -SimpleExpression -> ParenthesizedExpression : '$1'.
  -ParenthesizedExpression -> '(' Expression ')' : '$2'.
  -
  -%% Unary Operators
  -UnaryExpression -> PrimaryExpression : '$1'.
  -UnaryExpression -> '+' UnaryExpression : {op, '$1', '$2'}.
  -UnaryExpression -> '-' UnaryExpression : {op, '$1', '$2'}.
  -UnaryExpression -> '~' UnaryExpression : {op, '$1', '$2'}.
  -UnaryExpression -> 'not' UnaryExpression : {op, '$1', '$2'}.
  -
  -%% Exponential Operators
  -ExponentialExpression -> UnaryExpression : '$1'.
  -ExponentialExpression -> ExponentialExpression '**' UnaryExpression : {op, '$2', '$1', '$3'}.
  -
  -%% Multiplicative Operators
  -MultiplicativeExpression -> ExponentialExpression : '$1'.
  -MultiplicativeExpression -> MultiplicativeExpression '*' ExponentialExpression : {op, '$2', '$1', '$3'}.
  -MultiplicativeExpression -> MultiplicativeExpression '/' ExponentialExpression : {op, '$2', '$1', '$3'}.
  -MultiplicativeExpression -> MultiplicativeExpression '%' ExponentialExpression : {op, '$2', '$1', '$3'}.
  -
  -%% Additive Operators
  -AdditiveExpression -> MultiplicativeExpression : '$1'.
  -AdditiveExpression -> AdditiveExpression '+' MultiplicativeExpression : {op, '$2', '$1', '$3'}.
  -AdditiveExpression -> AdditiveExpression '-' MultiplicativeExpression : {op, '$2', '$1', '$3'}.
  -
  -%% Expressions
  -Expression -> AdditiveExpression : '$1'.
  +Grammar -> Statements : '$1'.
  +Statements -> '$empty' : [].
  +Statements -> Statements Statement: '$1' ++ ['$2'].
   
   %% Statements
   Statement -> EmptyStatement : '$1'.
  
positive.code: %% Expression Statement 
  ExpressionStatement -> Expression : '$1'.
  
  %% Programs
  
  Program -> Statements : '$1'.
  Statements -> '$empty' : [].
  Statements -> Statements Statement: '$1' ++ ['$2'].
negative.code: Nonterminals
    Grammar
    Statements
    Statement
    StatementEnding
    EmptyStatement
    ExpressionStatement
    Expression
    AdditiveExpression
    MultiplicativeExpression
    ExponentialExpression
    UnaryExpression
    PrimaryExpression
    SimpleExpression
    ParenthesizedExpression
    Number
    .
    
  Terminals
  