Consider the following macro:
(defmacro f [x] {:pre [(number? x)]} `(+ ~x 5))
=> (f 3)
8
=> (f true)
Unexpected error (AssertionError) macroexpanding f at
(test:localhost:62048(clj)*:265:28).
Assert failed: (number? x)
So, as expected it throws an AssertionError if passed a non-number.
However, the following test (using is from clojure.test) used to work prior
to 1.10, but now fails:
=> (is (thrown? AssertionError (f true)))
Unexpected error (AssertionError) macroexpanding f at
(test:localhost:62048(clj)*:268:56).
Assert failed: (number? x)
What's odd is that the macro still throws an AssertionError, but the
`thrown?` inside the `is` is no longer intercepting the AssertionError, so
the test doesn't pass -- instead the error causes a failure in the test
suite.
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