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