And what's the total length? Are you on windows? W...

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[karelpeeters]

And what's the total length? Are you on windows? What's the actual exception thrown?

[Toby]

Anything over 255 triggers it. Not on windows. Actual exception is FileNotFoundException (file name too long).

Example code:

class NameTooLongTestCase {
    fun `this is a very long function name used to illustrate the problem I'm hitting - an issue involving anonymous class compilation and I'm wondering if anyone knows a workaround - the file path of the anonymous class kotlinc produces is too long and the FileOutputStream used to write the classes to disk throws an exception`() {
        function_that_takes_a_lambda { }
    }

    fun function_that_takes_a_lambda(lambda: () -> Unit) {}
}

[Toby]

There's an existing issue for this problem here, I'm hoping someone has a workaround in the meantime https://youtrack.jetbrains.net/issue/KT-17433