anchor.diff:  script
   	:	functionDeclaration*
   	;
  +	
  +localVariableDeclaration
  +	:	VAR Identifier ASSIGN expression
  +	;
   
   functionDeclaration
   	:	FUNCTION Identifier formalParameters functionBody
  
positive.code: 
  forUpdate
  	:	expressionList
  	;
  	
  blockStatement
  	:	localVariableDeclarationStatement
  	|	statement
  	; 
  
  // expressions
  parExpression
  
negative.code: 	;
  
  block
  	:	LBRACE statement* RBRACE
  	;
  	
  formalParameter
  