pub trait OnExchangeRateChange<CurrencyId> {
    // Required method
    fn on_exchange_rate_change(currency_id: &CurrencyId);
}

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impl<CurrencyId, TupleElement0: OnExchangeRateChange<CurrencyId>, TupleElement1: OnExchangeRateChange<CurrencyId>> OnExchangeRateChange<CurrencyId> for (TupleElement0, TupleElement1)

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impl<CurrencyId, TupleElement0: OnExchangeRateChange<CurrencyId>, TupleElement1: OnExchangeRateChange<CurrencyId>, TupleElement2: OnExchangeRateChange<CurrencyId>> OnExchangeRateChange<CurrencyId> for (TupleElement0, TupleElement1, TupleElement2)

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impl<CurrencyId, TupleElement0: OnExchangeRateChange<CurrencyId>> OnExchangeRateChange<CurrencyId> for (TupleElement0,)

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impl<CurrencyId> OnExchangeRateChange<CurrencyId> for ()

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