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Make anonymous mirrors serializable #15391

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merged 3 commits into from
Jun 8, 2022
Merged

Make anonymous mirrors serializable #15391

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2365308
Make anonymous mirrors serializable
TimWSpence Jun 7, 2022
e5826ab
Test to assert that anonymous mirrors are Serializable
TimWSpence Jun 7, 2022
6ad5987
move test
bishabosha Jun 8, 2022
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2 changes: 1 addition & 1 deletion compiler/src/dotty/tools/dotc/typer/Synthesizer.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -228,7 +228,7 @@ class Synthesizer(typer: Typer)(using @constructorOnly c: Context):
val monoTypeDef = untpd.TypeDef(tpnme.MirroredMonoType, untpd.TypeTree(monoType))
val newImpl = untpd.Template(
constr = untpd.emptyConstructor,
parents = untpd.TypeTree(defn.ObjectType) :: Nil,
parents = untpd.TypeTree(defn.ObjectType) :: untpd.TypeTree(defn.JavaSerializableClass.typeRef) :: Nil,
derived = Nil,
self = EmptyValDef,
body = monoTypeDef :: Nil
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9 changes: 9 additions & 0 deletions tests/run/serialize.scala
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Expand Up @@ -27,6 +27,10 @@ object Test {
}
}

// No Companion defined - therefore anonmymous mirror is generated
sealed trait NoCompanion
case class Value(value: String) extends NoCompanion

def main(args: Array[String]): Unit = {
val x: PartialFunction[Int, Int] = { case x => x + 1 }
val adder = serializeDeserialize(x)
Expand All @@ -41,5 +45,10 @@ object Test {
val bar = new a.Bar
val bar1 = serializeDeserialize(bar)
assert(bar.x eq bar1.x)

val mirror = summon[scala.deriving.Mirror.Of[NoCompanion]]
val mirror1 = serializeDeserialize(mirror)
assert(mirror ne mirror1) // update if we start caching anonymous mirrors
assert(mirror1.ordinal(Value("")) == 0) // check API
}
}