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. 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

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

subtle

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

I'm using 1.3.30

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