Function diff 

pub fn diff(
    reference: &Run,
    observed: &Run,
    cost_model: &impl CostModel,
    params: &DiffParams,
) -> Result<DiffResult, ParamError>

Diff observed against reference: align, locate the fork, assemble the result.

Errors

ParamError::StepsExceedMax when either run is longer than the size guard (AlignParams::max_steps) — see crate::align.