I think I've found a compiler bug wrt inline class...

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[redrield]

I think I've found a compiler bug wrt inline classes, could someone confirm that my suspicion is correct?

I'm trying to convert an existing units library that I use to use inline classes rather than boxing every entity. Once I'd completed, some of the tests for this project were failing with ClassCastException errors. I looked into it with a decompiler, and found that in one of the cases where I'd used the inline class, the decompiler shows a cast to Double from Length, and I assume that's what's causing the exception.

https://0x0.st/zj-H.png▾

The source version of that is this:

operator fun contains(p: Translation2d) = p.x in x..(x + w) && p.y in y..(y + h)

where all of the fields in use are Length, the inline class wrapping Double

[kunalsheth]

I ran into the same issue with http://units.kunalsheth.info. What kotlin version are you using?

[Shawn]

subtle

[kunalsheth]

I saw that a lot in the 1.3 Release Candidates. Eventually I gave up and explicitly boxed wherever the exceptions were thrown:

[kunalsheth]

fun <Q : Quan<Q>> box(x: Q) = x as Quan<Q>

[kunalsheth]

This is the issue I had: https://youtrack.jetbrains.com/issue/KT-29075
but there are plenty more ClassCastExceptions with inline classes: https://youtrack.jetbrains.com/issues/KT?q=inline%20class%20ClassCastException

[redrield]

I'm using 1.3.30

[ilya.gorbunov]

@redrield Could you file an issue with the code to reproduce it?