anchor.diff:      ;
   
   subquery
  -    : matchNone
  +    : 'Default does not match anything'
       ;
   
   orderByClause
  
positive.code: ignoredIdentifiers_
      : ignoredIdentifier_ (COMMA_ ignoredIdentifier_)*
      ;
  
  matchNone
      : 'Default does not match anything'
      ;
  
negative.code:     //| match_expr
      | caseExpr
      | intervalExpr
      ;
  
  functionCall
  