Return only the raw evaluation error message without prefix #1726
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At the moment we store any evaluation error as
string(err)
which isgreat for its simplicity and allows us to unwrap the error and test it
with
errors.Is
orerrors.As
, but the string representation alsoincludes the string representation of the error itself.
In order to both support unwrapping but also be able to extract only the
raw message from the evaluator, let's add a
EvaluationError
structurethat implements the error interface so it can be tested for with
As
,unwraps into base which is
ErrEvaluationFailed
through the usualNewErrEvaluationFailed
.The user-visible result is that the errors are no longer stored with the
evaluation failure
prefix, but raw, which will be useful for storingJSON in the result.