# X_TEST_SHARD_FAILED

## Means

a test shard exited non-zero

## Typical cause

**registered, thrown by nothing since `x test --worker` was deleted.** It was that flag's failure; one CI job's share of the suite is `x verify --only unit --shard i/n`, and a red test there or in `x test` is `X_TEST_FAILED`

## Fix

delete any branch matching this code, because it never runs. Match `X_TEST_FAILED`, whose `fix` is the rerun

[CLI and verify](/error-codes#cli-and-verify)