Fix ClassCastException for lowercase objects in Scala 3

chimney-macro-commons/src/main/scala-3/io/scalaland/chimney/internal/compiletime/ExprPromisesPlatform.scala

@@ -140,10 +140,6 @@ private[compiletime] trait ExprPromisesPlatform extends ExprPromises { this: Def
  // Scala 3's enums' parameterless cases are vals with type erased, so w have to match them by value
  // case arg @ Enum.Value => ...
  CaseDef(Bind(bindName, Ident(sym.termRef)), None, body)
- else if sym.flags.is(Flags.Module) then
- // case objects are also matched by value but the tree for them is generated in a slightly different way
- // case arg @ Enum.Value => ...
- CaseDef(Bind(bindName, Ident(sym.companionModule.termRef)), None, body)
  else
  // case arg : Enum.Value => ...
  CaseDef(Bind(bindName, Typed(Wildcard(), TypeTree.of[SomeFrom])), None, body)

chimney/src/test/scala/io/scalaland/chimney/IssuesSpec.scala

@@ -769,4 +769,23 @@ class IssuesSpec extends ChimneySpec {
  .withFieldConst(_.bar.matchingSome.baz.everyItem.b, "new")
  .transform ==> Foo(Some(Bar(List(Baz(a = 10, b = "new", c = 10.0), Baz(a = 10, b = "new", c = 20.0)))))
  }
+
+ test("fix-issue #479") {
+ import Issue479.*
+ val orangeTarget = Target.Impl("orange")
+ val pinkTarget = Target.Impl("pink")
+ val yellowTarget = Target.Impl("yellow")
+
+ val writer: Transformer[color, Target] = Transformer
+ .define[color, Target]
+ .withCoproductInstance[color.orange.type](_ => orangeTarget)
+ .withCoproductInstance[color.pink.type](_ => pinkTarget)
+ .withCoproductInstance[color.yellow.type](_ => yellowTarget)
+ .enableMacrosLogging
+ .buildTransformer
+
+ assert(writer.transform(color.pink) == pinkTarget)
+ assert(writer.transform(color.yellow) == yellowTarget)
+ assert(writer.transform(color.orange) == orangeTarget)
+ }
 }

chimney/src/test/scala/io/scalaland/chimney/fixtures/Issues.scala

@@ -214,3 +214,17 @@ object Issue579 {
  case class Bar(baz: List[Baz])
  case class Baz(a: Int, b: String, c: Double)
 }
+
+object Issue479 {
+ sealed trait color
+ object color {
+ case object orange extends color
+ case object pink extends color
+ case object yellow extends color
+ }
+
+ sealed trait Target
+ object Target {
+ case class Impl(value: String) extends Target
+ }
+}