Given a situation like this, exercising an fspec will fail:

Problem: exercise will generate a function that validates the args and returns a gen int. When exercise then conforms that generated fspec function, it calls conform on the fspec-impl. fspec-impl conform* calls validate-function. validate-function runs quick-check on the generated function but conform* and validate-function do not have access to the generator overrides specified in exercise. This same problem also happens if you run stest/check on anything using the fspec (like an fdef with an fspec arg).