anchor.diff:  	:	fieldModifier* unannType variableDeclaratorList ';'
   	;
   
  -fieldModifier returns [ Modifier m]
  +fieldModifier returns [Modifier m]
   	:	a = annotation {$m = $a;}
   	|	'public' {$m = Modifier.PUBLIC;}
   	|	'protected' {$m = Modifier.PROTECTED;}
  
positive.code: 	;
  
  enumConstantName returns [String s]
  	:	id = Identifier {$s = $id;}
  	;
  
  whileStatement returns [WhileStatement st]
  
negative.code: 	;
  
  simpleTypeName returns [String s]
  	:	id = Identifier {$s = $id.getText();}
  	;
  
  constructorBody
  