anchor.diff:      ;
   
   createDefinition_
  -    : columnDefinition | constraintDefinition | indexDefinition_ | checkExpr_
  +    : columnDefinition | constraintDefinition | indexDefinition_ | checkConstraintDefinition_
       ;
   
   columnDefinition
  
positive.code:     : columnName (LP_ NUMBER_ RP_)? (ASC | DESC)?
      ;
  
  checkExpr_
      : CHECK expr
      ;
  
  createLike_
  
negative.code:     : RESTRICT | CASCADE | SET NULL | NO ACTION | SET DEFAULT
      ;
  
  constraintDefinition
      : (CONSTRAINT ignoredIdentifier_?)? (primaryKeyOption_ | uniqueOption_ | foreignKeyOption_)
      ;
  