Unexpected int too large error

[patiences]

print(10000000000000000000)

results in a struct.error:

Traceback (most recent call last):
  File "/Users/Patience/Desktop/gsoc/voc/env/bin/voc", line 11, in <module>
    load_entry_point('voc', 'console_scripts', 'voc')()
  File "/Users/Patience/Desktop/gsoc/voc/voc/__main__.py", line 52, in main
    verbosity=args.verbosity
  File "/Users/Patience/Desktop/gsoc/voc/voc/transpiler.py", line 33, in transpile
    transpiler.write(outdir)
  File "/Users/Patience/Desktop/gsoc/voc/voc/transpiler.py", line 62, in write
    javaclassfile.write(out)
  File "/Users/Patience/Desktop/gsoc/voc/voc/java/klass.py", line 422, in write
    constant_pool.write(writer)
  File "/Users/Patience/Desktop/gsoc/voc/voc/java/constants.py", line 151, in write
    constant.write(writer)
  File "/Users/Patience/Desktop/gsoc/voc/voc/java/constants.py", line 211, in write
    self.write_info(writer)
  File "/Users/Patience/Desktop/gsoc/voc/voc/java/constants.py", line 697, in write_info
    writer.write_s8(self.value)
  File "/Users/Patience/Desktop/gsoc/voc/voc/java/klass.py", line 85, in write_s8
    self._outfile.write(struct.pack('>q', u8))
struct.error: int too large to convert

(Calling voc from the command line)