Now that we're testing the curry/autoreturn/continuations combo, figure out the broken test case (marked with error[...]) in test_conts.py.

The test itself works fine, and would pass... but integration with the test framework is lacking. A with show_expanded and some poking shows that the unpythonic_assert becomes a curried function that is never called, so if the test uses test[...] instead of assert, the test assertion never runs.

Also, in that particular with block, print fails if running on PyPy3. Investigate this, too.