Interesting: Scala 2.13's singleton types seem to be preserved in string/int addition.pic.twitter.com/o70LU6Avio
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That's not new, though. It certainly worked in Scala 2.10, and probably all the way back to 2.0...
(I don't have a pre-Java-8 JVM lying around any more, so I can't test before 2.10...)
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whaat, isn't the JVM supposed to be able to run code compiled for older versions?
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Yeah. I'm not sure why it doesn't work, but the REPL does compilation, and uses classloaders, and I can easily believe there's at least one broken link in the chain which stops it working...
End of conversation
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