Panic because of unwrap in rw.rs

Here the stacktrace:

thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: LazyBsm { inner: UnsafeCell }', C:\Users\ccgauche\.cargo\git\checkouts\coffer-00a025115db79fbc\50f5e5d\bytecode\src\rw.rs:91:57
stack backtrace:
   0: std::panicking::begin_panic_handler
             at /rustc/803c60218ffac3384b0063c1b87ae7944163bba7\/library\std\src\panicking.rs:493
   1: core::panicking::panic_fmt
             at /rustc/803c60218ffac3384b0063c1b87ae7944163bba7\/library\core\src\panicking.rs:92
   2: core::option::expect_none_failed
             at /rustc/803c60218ffac3384b0063c1b87ae7944163bba7\/library\core\src\option.rs:1268
   3: core::result::Result<coffer::dynamic::LazyBsm, alloc::rc::Rc<coffer::dynamic::LazyBsm>>::unwrap<coffer::dynamic::LazyBsm,alloc::rc::Rc<coffer::dynamic::LazyBsm>>
             at C:\Users\ccgauche\.rustup\toolchains\nightly-x86_64-pc-windows-msvc\lib\rustlib\src\rust\library\core\src\result.rs:973
   4: coffer::rw::ConstantPoolWriter::insert_dynamic<coffer::cp::VecCp>
             at C:\Users\ccgauche\.cargo\git\checkouts\coffer-00a025115db79fbc\50f5e5d\bytecode\src\rw.rs:91
   5: coffer::code::{{impl}}::write_to<coffer::cp::VecCp,std::io::cursor::Cursor<mut alloc::vec::Vec<u8, alloc::alloc::Global>*>>
             at C:\Users\ccgauche\.cargo\git\checkouts\coffer-00a025115db79fbc\50f5e5d\bytecode\src\code.rs:1122
   6: coffer::member::{{impl}}::write_to<coffer::cp::VecCp,alloc::vec::Vec<u8, alloc::alloc::Global>>
             at C:\Users\ccgauche\.cargo\git\checkouts\coffer-00a025115db79fbc\50f5e5d\bytecode\src\member.rs:87
   7: coffer::member::{{impl}}::write_to<coffer::cp::VecCp,alloc::vec::Vec<u8, alloc::alloc::Global>>
             at C:\Users\ccgauche\.cargo\git\checkouts\coffer-00a025115db79fbc\50f5e5d\bytecode\src\member.rs:107
   8: coffer::{{impl}}::write_to<std::fs::File>
             at C:\Users\ccgauche\.cargo\git\checkouts\coffer-00a025115db79fbc\50f5e5d\bytecode\src\lib.rs:161
   9: CObJava::main
             at .\src\main.rs:18
  10: core::ops::function::FnOnce::call_once<fn(),tuple<>>
             at C:\Users\ccgauche\.rustup\toolchains\nightly-x86_64-pc-windows-msvc\lib\rustlib\src\rust\library\core\src\ops\function.rs:227
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
error: process didn't exit successfully: `target\debug\CObJava.exe` (exit code: 101)

Steps to reproduce:

fn main() {
    let f = File::open("GameEndRequest.class").unwrap();
    let mut reader = BufReader::new(f);
    let class: Class = ReadWrite::read_from(&mut reader).unwrap();
    let mut f1 = OpenOptions::new()
        .write(true)
        .append(false)
        .create(true)
        .open("GameEndRequest_1.class")
        .unwrap();
    class.write_to(&mut f1).unwrap();
}

Here the class file: GameEndRequest.class Here the source if you want to search for the problem: GameEndRequest.java

closed with commit 7540f5ad

Just fixed the error that caused the panic. It still errors when doing Read -> Write -> Read, which will be fixed later for the 1.1.0 release.

mentioned in issue #3