db.mu.Lock()
	if n > 0 {
		db.maxIdleCount = n
	} else {
		// No idle connections.
		db.maxIdleCount = -1
	}
	// Make sure maxIdle doesn't exceed maxOpen
	if db.maxOpen > 0 && db.maxIdleConnsLocked() > db.maxOpen {
		db.maxIdleCount = db.maxOpen
	}
	var closing []*driverConn
	idleCount := len(db.freeConn)
	maxIdle := db.maxIdleConnsLocked()
	if idleCount > maxIdle {
		closing = db.freeConn[maxIdle:]

		t.Errorf("free conns = %d; want %d", g, w)
	}
}

// Issue 10886: tests that all connection attempts return when more than
// DB.maxOpen connections are in flight and the first DB.maxOpen fail.
func TestPendingConnsAfterErr(t *testing.T) {
	const (
		maxOpen = 2
		tryOpen = maxOpen*2 + 2
	)

	// No queries will be run.
	db, err := Open("test", fakeDBName)
	if err != nil {
		t.Fatalf("Open: %v", err)

	IN_MOVED_TO                                 = 0x80
	IN_MOVE_SELF                                = 0x800
	IN_ONESHOT                                  = 0x80000000
	IN_ONLYDIR                                  = 0x1000000
	IN_OPEN                                     = 0x20
	IN_Q_OVERFLOW                               = 0x4000
	IN_UNMOUNT                                  = 0x2000
	IPPROTO_AH                                  = 0x33