anchor.diff:          TOKENDCASE
   
       rule let_statement:
  -        TOKLET
  -        ( VAR
  -        | LBRACE VAR (COMMA VAR)* RBRACE
  -        )
  -        assign_opvalue SEMICOLON
  +        TOKLET ( VAR | LBRACE VAR (COMMA VAR)* RBRACE) assign_opvalue SEMICOLON
   
       rule rule_statement:
           TOKRULE VAR [paren_expression] SEMICOLON
  
positive.code:         | TOKPAR statement_list TOKENDPAR
          | return_statement
          | rule_statement
          | TOKWHILE paren_expression
              (    group_statement
              |    VAR SEMICOLON
              )
          | builtin_type declared_item ( COMMA declared_item )* SEMICOLON
          | expr<<[]>>
              [   ( declared_item ( COMMA declared_item )*
  
negative.code: ############################################################################
  
      rule method_declaration:
          TOKMETHOD type_decl [ VAR ] [ formal_list [VAR] ]
          ( ( TOKIF | TOKCLOCKED_BY | TOKRESET_BY | TOKENABLE | TOKREADY) paren_expression )*
          [ equal_value ]
          [ provisos_clause ] SEMICOLON
  