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Petr Pudlak authored
This allows to use Alternative specific combinators, namely `optional`. Signed-off-by: Petr Pudlak <pudlak@google.com> Reviewed-by: Klaus Aehlig <aehlig@google.com> Cherry-pick of 78209a84 Signed-off-by: Klaus Aehlig <aehlig@google.com> Reviewed-by: Petr Pudlak <pudlak@google.com>
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