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Add regression test #12923

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Jun 25, 2021
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27 changes: 27 additions & 0 deletions tests/pos/i12910.scala
Original file line number Diff line number Diff line change
@@ -0,0 +1,27 @@
trait Type[T]:
type Out

type varchar

given Type[varchar] with
type Out = String

class Placeholder[T, U]

object Placeholder:
def apply[T](using t: Type[T]): Placeholder[T, t.Out] = new Placeholder

trait Encoder[P, X]:
def encode(x: X): String

object Encoder:
def apply[P, X](placeholder: P)(using e: Encoder[P, X]): X => String = e.encode

given [T, X]: Encoder[Placeholder[T, X], X] with
def encode(x: X): String = ???

def Test =
// the following compiles just fine
Encoder(new Placeholder[varchar, String])("hello")
// the following fails
Encoder(Placeholder[varchar])("hello")