Updated interesting examples requring double twists.

1 job for master in 11 minutes and 6 seconds (queued for 13 minutes and 54 seconds)
Status Job ID Name Coverage
  Test
failed #186119335
python2.7

00:11:06

 
Name Stage Failure
failed
python2.7 Test
       ^~~~~~~~~~~~~~~~
surface_dynamics/interval_exchanges/integer_iet.c:6777:3: warning: statement with no effect [-Wunused-value]
print_backtrace;
^~~~~~~~~~~~~~~
error: command 'x86_64-linux-gnu-gcc' failed with exit status 1

----------------------------------------
Command "/usr/bin/python -u -c "import setuptools, tokenize;__file__='/tmp/pip-build-qaFqHs/surface-dynamics/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" install --record /tmp/pip-IppG1a-record/install-record.txt --single-version-externally-managed --compile" failed with error code 1 in /tmp/pip-build-qaFqHs/surface-dynamics/
ERROR: Job failed: exit code 1