IllegalAccessError when using Raise

[CLOVIS-AI]

Arrow version: 1.2.1

I'm trying to integrate Raise into my test library, Prepared. Since raising usually represents an error, I want to be able to declare that a test fails if an error is raised. To help with debugging, I'd like to enable tracing in those cases (since this is only for testing, I don't mind the performance implications).

I want to be able to declare something like:

test("Some test") {
    failOnRaise {
        raise(5)
    }
}

For now, here's the implementation I have:

@ExperimentalTraceApi
inline fun <Failure, Success> failOnRaise(block: Raise<Failure>.() -> Success): Success {
	val result = either {
		traced(block) { trace, error ->
			throw AssertionError("An operation raised $error\n${trace.stackTraceToString()}")
				.apply {
					for (suppressed in trace.suppressedExceptions())
						addSuppressed(suppressed)
				}
		}
	}

	check(result is Either.Right) { "Impossible situation: we throw an error when the passed block raises, but it still gave us a failed either: $result" }
	return result.value
}

However, when I execute it, I get:

java.lang.AssertionError: Expected exception java.lang.AssertionError but a IllegalAccessError was thrown instead.

The stack trace is unhelpful (it doesn't go further than the test function).

Do you know what could cause this?

---

The entire code is available here.

As an aside, would it be possible to expose the underlying exception in traced? It would be easier to simply mark it as the cause of the AssertionError.

[nomisRev]

Hey @CLOVIS-AI,

Your code doesn't compile for me 🤯 Removing () from suppressedExceptions, and works for me

for (suppressed in trace.suppressedExceptions)
  addSuppressed(suppressed)

But I think it's actually related somehow to how suppressedExceptions works, it uses reflection to get access to getSuppressed. https://github.com/JetBrains/kotlin/blob/f98451e38169a833f60b87618db4602133e02cf2/libraries/stdlib/jvm/src/kotlin/internal/PlatformImplementations.kt#L37
Calling Method::invoke from java.lang.reflect throws IllegalAccessError .

[CLOVIS-AI]

I don't understand it, then. The Arrow documentation does say it is a function… It doesn't compile on my side if I try to access it any other way.

[kyay10]

Debugging, I think it has something to do with RaiseCancellationException being private, yet being used inside the inline method traced. I'm surprised that the compiler even allowed that. I think Kotlin doesn't allow that occurring with methods, but lets it happen with types, which results in client code trying to catch an exception of type RaiseCancellationException. I'm not sure how to reproduce this, but the fix is very simple. Testing locally, it seems to work. See #3316

[CLOVIS-AI]

Can confirm this is fixed for me with Arrow 1.2.3.