anchor.diff:  
   @header {
     package lpn.parser.properties;
  -  
  - // package antlrPackage;
  +  //import lpn.parser.LhpnFile;
  +  //package antlrPackage;
   }
   
   @lexer::header { 
  
positive.code: :ASSERT_UNTIL^ LPARA! expression COMMA! expression RPARA! SEMICOL!
  ;
  
  edge_expression
  : POSEDGE^ ID
  ;
  assertStable_statement
  :ASSERT_STABLE^ LPARA! expression COMMA! expression RPARA! SEMICOL!
  ;
  
  statement
  	:wait_statement
  
negative.code: 	|assertUntil_statement
  	|always_statement
  	|assertStable_statement
  	|edge_statement
  	; 
  	
  
  