val List(a, b, c, rest*) = ...
val List(a, b, c, rest @ _*) = ...
Both seem to work, but I've had situations where the former raises the error "bad simple pattern". Only occasionally though.
Why is this?
`rest*` vs `rest @ _*` when pattern matching in Scala
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This is difference between Scala 2 and Scala 3 syntax. Just Scala 2 syntax is still working so far in Scala 3
Scala 2:
https://scastie.scala-lang.org/SJbD2tTBQgiI4kF6Lun1rQ
https://scastie.scala-lang.org/lCVAKK2WTlG99n6bBh4Tcw
Scala 3:
https://scastie.scala-lang.org/rV7UCBDaRzWyXLFNeRxxsg
Docs:
https://docs.scala-lang.org/scala3/reference/changed-features/vararg-splices.html
https://dotty.epfl.ch/docs/reference/changed-features/vararg-splices.html