package main

import (
	"database/sql"
	"database/sql/driver"
	"fmt"
	"os"

	_ "github.com/lib/pq"
)

var _ driver.Valuer = customData{}

type customData struct{}

func (customData) Value() (driver.Value, error) {
	panic("oh no!")
}

func main() {
	db, err := sql.Open("postgres", "dbname=test_bug sslmode=disable")
	if err != nil {
		fmt.Printf("opening database: %v\n", err)
		os.Exit(1)
	}
	defer db.Close()

	tx, err := db.Begin()
	if err != nil {
		fmt.Printf("beginning transaction: %v\n", err)
		os.Exit(1)
	}
	defer tx.Rollback()

	var flag bool
	err = tx.QueryRow("SELECT TRUE WHERE $1", customData{}).Scan(&flag)
	if err != nil {
		fmt.Printf("executing query: %v\n", err)
		os.Exit(1)
	}

	fmt.Printf("we got a %v\n", flag)
	os.Exit(0)
}

res, err = func() (res Result, err error) {
	defer func() {
		p := recover()
		if p != nil {
			releaseConn(fmt.Errorf("panic: %v", p))
			panic(p)
		}
		releaseConn(err)
	}()

	return resultFromStatement(ctx, dc.ci, ds, args...)
}()

if err != driver.ErrBadConn {
	return res, err
}