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/// Convenience macro for emitting multiple events.
///
/// # Example
///
/// ```rust,ignore
/// fn handle(self, input: Input) -> Result<Emit, CommandError> {
/// Ok(emit![
/// SentFunds {
/// account_id: input.source_account,
/// amount: input.amount,
/// recipient_id: Some(input.dest_account.clone()),
/// },
/// ReceivedFunds {
/// account_id: input.dest_account,
/// amount: input.amount,
/// sender_id: Some(input.source_account),
/// },
/// ])
/// }
/// ```
///
/// Expands to:
///
/// ```rust,ignore
/// Emit::new()
/// .event(SentFunds { ... })
/// .event(ReceivedFunds { ... })
/// ```