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kotlinlang

I'm getting an `IncompatibleClassChangeError` on JDK 9 that I'm not expecting.
<https://travis-ci.org/junit-team/junit5/jobs/270169944#L1267-L1268>

I'm not sure why but I seem to be getting it from this test.
Any thoughts on why this might occur on JDK 9 but not JDK 8?
<https://github.com/junit-team/junit5/pull/1001/files#diff-140541d5d08c428c13588c5f777f9218R49>

Fixed by setting the compiler options to target 1.8
<https://github.com/junit-team/junit5/pull/1001/files#diff-c197962302397baf3a4cc36463dce5eaR172>