Improve reporting in transducers generative test.
If the transducers generative test breaks, you get output like this:
This has a few problems:
when clojure functions are given as arguments, they're full object printouts, with classnames and memory addresses, this is kind of hard to read
the combination of the first problem found with the shrunk version means there's a lot of content to read
lack of pretty printing makes that content very hard to read
the traceback isn't actually that helpful – we know what failed already.
Approach: The attached patch encodes more descriptive info in the actions and does a better job of reporting the difference in an understandable manner:
Screened by: Alex Miller