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Petr Pudlak authored
`orElse` works just as `mplus` of ResultT, but it only requires `MonadError` and doesn't accumulate the errors, it just returns the second one, if both actions fail. Signed-off-by: Petr Pudlak <pudlak@google.com> Reviewed-by: Klaus Aehlig <aehlig@google.com>
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