web3 0.11.0

Ethereum JSON-RPC client.
Documentation 
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use crate::types::{BlockId, Index, H256};

/// Transaction Identifier
#[derive(Clone, Debug, PartialEq)]
pub enum TransactionId {
    /// By hash
    Hash(H256),
    /// By block and index
    Block(BlockId, Index),
}

impl From<H256> for TransactionId {
    fn from(hash: H256) -> Self {
        TransactionId::Hash(hash)
    }
}