anchor.diff:      ;
   
   // https://docs.microsoft.com/en-us/sql/t-sql/language-elements/raiserror-transact-sql
  -raiseerror_statementb
  +raiseerror_statement
       : RAISERROR '(' msg=(DECIMAL | STRING | LOCAL_ID) ',' severity=constant_LOCAL_ID ','
       state=constant_LOCAL_ID (',' constant_LOCAL_ID)* ')' (WITH (LOG | SETERROR))? ';'?
       ;
  
positive.code:     | waitfor_statement
      | while_statement
      | print_statement
      | raiseerror_statementb
      ;
  
  // https://docs.microsoft.com/en-us/sql/t-sql/language-elements/begin-end-transact-sql
  
negative.code: unary_operator_expression
      : '~' expression
      | op=('+' | '-') expression
      ;
  
  bracket_expression
  