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scala> class C
defined class C
scala> def f = { object o extends C; o}
f: ewo.type forSome { val o: o; type o <: C with ScalaObject }
scala> val x = f
<console>:6: error: type mismatch;
found : o.type(in object $iw) where type o.type(in object $iw) <: o with Singleton
required: o.type(in value x) forSome { type o.type(in value x) <: o with Singleton; type o <: C with ScalaObject }
val x = f
^
scala> val x : C = f
x: C = o$2$@111985e
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