anchor.diff:  constraintState
       : notDeferrable 
       | initiallyClause 
  -    | RELY 
  -    | NORELY 
  +    | RELY | NORELY 
       | usingIndexClause 
  -    | ENABLE 
  -    | DISABLE 
  -    | VALIDATE 
  -    | NOVALIDATE 
  +    | ENABLE | DISABLE 
  +    | VALIDATE | NOVALIDATE 
       | exceptionsClause
       ;
   
  
positive.code:     ;
  
  exceptionsClause
      : EXCEPTIONS INTO
      ;
  
  usingIndexClause
  
negative.code: 
  outOfLineConstraint
      : (CONSTRAINT ignoredIdentifier_)?
      (UNIQUE columnNames
      | primaryKey columnNames 
      | FOREIGN KEY columnNames referencesClause
      | CHECK LP_ expr RP_
      ) constraintState*
      ;
  
  outOfLineRefConstraint
  