# `Lockstep.ReplayDivergence`
[🔗](https://github.com/b-erdem/lockstep/blob/v0.1.0/lib/lockstep/replay_divergence.ex#L1)

Raised by `Lockstep.Replay.run/2` when the replayed schedule cannot be
faithfully reproduced from the recorded trace. Almost always means the
user code under test depends on uncontrolled nondeterminism — raw RNG,
system time, ETS interleavings inside non-yielding handlers, NIFs, or
real I/O.

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*Consult [api-reference.md](api-reference.md) for complete listing*