solana-rpc 3.1.10

Solana RPC
Documentation 
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use {
    solana_account::AccountSharedData, solana_pubkey::Pubkey, solana_runtime::bank::Bank,
    std::collections::HashMap,
};

pub(crate) fn get_account_from_overwrites_or_bank(
    pubkey: &Pubkey,
    bank: &Bank,
    overwrite_accounts: Option<&HashMap<Pubkey, AccountSharedData>>,
) -> Option<AccountSharedData> {
    overwrite_accounts
        .and_then(|accounts| accounts.get(pubkey).cloned())
        .or_else(|| bank.get_account(pubkey))
}