try {
                func();

                // commitTransaction() calls assert.commandWorked(), which may fail with a
                // WriteConflict error response. We therefore suppress its doassert() output.
                quietly(() => session.commitTransaction());
            } catch (e) {
                if (!e.hasOwnProperty('errorLabels') ||
                    !e.errorLabels.includes('TransientTransactionError')) {
                    throw e;
                }
            ...
            }