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Test that no into on enums and current mirror behavior for into #23473

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Jul 4, 2025
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Test that no into on enums and current mirror behavior for into #23473

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27 changes: 27 additions & 0 deletions tests/neg/i23400.scala
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import scala.language.experimental.into
import Conversion.into

import scala.deriving.Mirror

object Opaques:
opaque into type MyInto[+A] >: A = A

import Opaques.MyInto

case class Foo(x: Int)
case class Bar(foo: into[Foo])
case class Baz(foo: MyInto[Foo])

given Conversion[Int, Foo] = Foo(_)

into enum Color: // error
case Red, Green

def test =
val barMirror = summon[Mirror.Of[Bar]]
summon[barMirror.MirroredElemTypes =:= (into[Foo] *: EmptyTuple.type)] // error
summon[barMirror.MirroredElemTypes =:= (Foo *: EmptyTuple.type)] // ok

val bazMirror = summon[Mirror.Of[Baz]]
summon[bazMirror.MirroredElemTypes =:= (MyInto[Foo] *: EmptyTuple.type)] // ok
summon[bazMirror.MirroredElemTypes =:= (Foo *: EmptyTuple.type)] // error
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