Function create_tape_block 

fn create_tape_block(
    address: Address,
    code: &[Unsigned36Bit],
    last: bool,
) -> Result<Vec<Unsigned36Bit>, AssemblerFailure>

Create (and return) a block of data ready to be punched to tape such that the standard reader leader can load it.

See ../readerleader.rs for documentation on the format of a block.