code: func (tx *Tx) NamedStmt(stmt *NamedStmt) *NamedStmt {
  	return &NamedStmt{
  		QueryString: stmt.QueryString,
  		Params:      stmt.Params,
  		Stmt:        tx.Stmtx(stmt.Stmt),
  	}
  }
docs: // NamedStmt returns a version of the prepared statement which runs within a transaction.