code: func (n *NamedStmt) MustExecContext(ctx context.Context, arg interface{}) sql.Result {
  	res, err := n.ExecContext(ctx, arg)
  	if err != nil {
  		panic(err)
  	}
  	return res
  }
docs: // MustExecContext execs a NamedStmt, panicing on error
  // Any named placeholder parameters are replaced with fields from arg.