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[spec] clojure.spec.alpha/exercise-fn should emit a bettor error message when no implementation is found for a symbol

Description

Here we get a NullPointerException because although we do have a spec for foo, we don't have an implementation for it, a more descriptive error message would help.

Proposed: Check for a nil function and throw.

Patch: clj-2190.patch

Environment

Clojure 1.9.0-alpha17
test.check 0.10.0-alpha2

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Alex Miller June 22, 2018 at 9:49 PM

The sym-or-f arg is resolved to nil before exercise-fn is invoked, so we have no symbol to report by that point.

Stuart Halloway June 22, 2018 at 9:20 PM

If we are going to handle this case, can we also include the name of the offending symbol in the error message?

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Created June 27, 2017 at 4:17 PM
Updated October 2, 2019 at 1:32 PM