anchor.diff:  
   foreignKeyOption_
       : FOREIGN KEY indexName? columnNames referenceDefinition_
  +    ;
  +
  +createLikeClause_
  +    : LP_? LIKE tableName RP_?
       ;
   
   alterSpecifications_
  
positive.code:     : LP_ createDefinitions_ RP_
      ;
  
  createLikeClause_
      : LP_? LIKE tableName RP_?
      ;
  
  createDefinitions_
      : createDefinition_ (COMMA_ createDefinition_)*
      ;
  
negative.code: 
  constraintDefinition_
      : (CONSTRAINT ignoredIdentifier_?)? (primaryKeyOption_ | uniqueOption_ | foreignKeyOption_)
      ;
  
  inlineDataType_
  