If I could somehow trigger pytest_assertrepr_compare() so it would receive op=None, left=myresult, right=None (or something similar), then I could handle failing cases by getting the needed information from a property of a Falsy return value.
I'm also wondering: might it be possible to use pytest_addhooks() to add a hook to modify the AST or even modify the pre-parsed source? If I could automatically re-write "assert myfunc(myobj)" but leave other cases unchanged, this would clean things up for me. Although as I mentioned earlier, I don't see a way to interact with the AST or the AssertionRewriter within pytest's plugin system.
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