Typecheck: Do more substitution on reduced preds #680
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Add a test case that fails to typecheck without the substitution. It's unclear if this is the most efficient fix -- for example, if the substitution is just covering for an issue earlier where the predicates are created -- but this doesn't seem to increase the run time of the testsuite, so it's probably ok.
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This fixes #678 and adds its example as a test case in the test suite.