anchor.diff:      ;
   
   doIterator
  -    :   
  -    localDeclaration
  +    : localDeclaration
       ;
   
   tryCatchFinally
  
positive.code:     ;
      
  resource
      :   
      localDeclaration | expression
      ;
  
  // Lexer
  
negative.code:     ;
      
  caseExprs
      : expression (',' expression)* | 'is' type
      ;
      
  caseElse
  