pub fn mock_process_instruction(
    loader_id: &Pubkey, 
    program_indices: Vec<usize>, 
    instruction_data: &[u8], 
    transaction_accounts: Vec<TransactionAccount>, 
    instruction_accounts: Vec<AccountMeta>, 
    expected_result: Result<(), InstructionError>, 
    process_instruction: ProcessInstructionWithContext
) -> Vec<AccountSharedData>ⓘNotable traits for Vec<u8, A>impl<A> Write for Vec<u8, A> where
    A: Allocator,