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Don't constrain type variables in normalize #15223

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May 19, 2022
Merged

Don't constrain type variables in normalize #15223

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2 changes: 1 addition & 1 deletion compiler/src/dotty/tools/dotc/typer/ProtoTypes.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -793,7 +793,7 @@ object ProtoTypes {
else mt.derivedLambdaType(mt.paramNames, mt.paramInfos, rt)
case _ =>
val ft = defn.FunctionOf(mt.paramInfos, rt)
if (mt.paramInfos.nonEmpty || ft <:< pt) ft else rt
if mt.paramInfos.nonEmpty || (ft frozen_<:< pt) then ft else rt
}
}
case et: ExprType =>
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13 changes: 13 additions & 0 deletions tests/pos/i15171.scala
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Original file line number Diff line number Diff line change
@@ -0,0 +1,13 @@
case class Expr[+T](get: T)
trait Ctx[F[_]]
sealed trait Selector[F[_]]:
def appended(base: Expr[SelectLoop[F]]): Expr[SelectLoop[F]]

// Without Ctx[F] argument it would compile correctly
class SelectLoop[F[_]](using Ctx[F])
object SelectLoop:
def loopImpl[F[_]](ctx: Ctx[F])(caseDefs: List[Selector[F]]): Expr[Unit] =
// Adding explicit type :Expr[SelectLoop[F]] satifies the compiler
val s0 = Expr(new SelectLoop[F](using ctx))
val g = caseDefs.foldRight(s0)(_.appended(_))
Expr(())