return &Stmt{stickyErr: err}
			}
			si = ds.si
		}
		parentStmt = stmt
	}

	txs := &Stmt{
		db: tx.db,
		cg: tx,
		cgds: &driverStmt{
			Locker: dc,
			si:     si,
		},
		parentStmt: parentStmt,
		query:      stmt.query,
	}
	if parentStmt != nil {
		tx.db.addDep(parentStmt, txs)
	}
	tx.stmts.Lock()
	tx.stmts.v = append(tx.stmts.v, txs)

	}
	// tx.Stmt increments numPrepares because stmt is closed.
	txs := tx.Stmt(stmt)
	if txs.stickyErr != nil {
		t.Fatal(txs.stickyErr)
	}
	if txs.parentStmt != nil {
		t.Fatal("expected nil parentStmt")
	}
	_, err = txs.Exec(`Eric`, 82)
	if err != nil {
		t.Fatalf("txs.Exec = %v", err)
	}

	err = txs.Close()
	if err != nil {
		t.Fatalf("txs.Close = %v", err)