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Nov 19, 2025
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chore: add regression test for #24460 #24480

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18 changes: 18 additions & 0 deletions tests/neg/i24460.check
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-- Error: tests/neg/i24460.scala:12:20 ---------------------------------------------------------------------------------
12 | val _ = singletons[A, (A.A1.type, A.A2.type, A.A3.type)] // error
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
| cannot reduce summonFrom with
| patterns : case given ev @ _:ValueOf[(test.A.A1 : test.A) & test.A]
|-------------------------------------------------------------------------------------------------------------------
|Inline stack trace
|- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
|This location contains code that was inlined from Predef.scala:156
156 | inline def valueOf[T]: T = summonFrom {
| ^
157 | case ev: ValueOf[T] => ev.value
158 | }
|- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
|This location contains code that was inlined from Predef.scala:156
7 | case _: (h *: t) => valueOf[`h` & T] +: singletons[T, t]
| ^^^^^^^^^^^^^^^^
-------------------------------------------------------------------------------------------------------------------
13 changes: 13 additions & 0 deletions tests/neg/i24460.scala
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import scala.compiletime.{erasedValue, summonFrom}

object test {
private inline def singletons[T, Elem <: Tuple]: Seq[T] =
inline erasedValue[Elem] match {
case _: EmptyTuple => Seq.empty
case _: (h *: t) => valueOf[`h` & T] +: singletons[T, t]
}

enum A { case A1, A2, A3 }

val _ = singletons[A, (A.A1.type, A.A2.type, A.A3.type)] // error
}