Scala 2 overrides a return type to an inferred type; Scala 3 does not about scala-3-migration-guide HOT 4 CLOSED

isn't a compiler error, it's a runtime error

fair. in any case, it's a potential migration concern.

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Yes, it happened here: scala/scala-parser-combinators#370

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scala/scala-parser-combinators#370 isn't a compiler error, it's a runtime error. And I still don't really think either compiler's at fault, as it's just some crazy class casting code

      def apply(in: Input) = {
        /*
         * transformed reader
         */
        val inMem = in.asInstanceOf[PackratReader[Elem]]

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Thanks for reporting!

Do you think this pattern could cause a compiler error when porting a valid piece of Scala 2.13 code to Scala 3?

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