Created
October 15, 2023 21:40
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Scala 3 inlines before tailrec analysis
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| // compiles | |
| //> using scala "3.3.1" | |
| import scala.annotation.tailrec | |
| case class Opt[A](value: A | Null) { | |
| inline def flatMap[B](inline f: A => Opt[B]): Opt[B] = | |
| if (value == null) | |
| Opt(null) | |
| else | |
| f(value.asInstanceOf[A]) | |
| } | |
| @tailrec | |
| final def unwrap(s: Int, calls: Int): Opt[Int] = | |
| if calls > 0 then Opt(42).flatMap(unwrap(_, calls - 1)) | |
| else Opt(42) | |
| // doesn't compile | |
| //> using scala "3.3.1" | |
| import scala.annotation.tailrec | |
| case class Opt[A](value: A | Null) { | |
| def flatMap[B](f: A => Opt[B]): Opt[B] = | |
| if (value == null) | |
| Opt(null) | |
| else | |
| f(value.asInstanceOf[A]) | |
| } | |
| @tailrec | |
| final def unwrap(s: Int, calls: Int): Opt[Int] = | |
| if calls > 0 then Opt(42).flatMap(unwrap(_, calls - 1)) | |
| else Opt(42) |
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