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Add tests for wrong uses of java.lang.Enum
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enum E extends java.lang.Enum[E]("name", 0) { // error
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case A, B
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}

tests/neg/extend-java-enum.scala

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import java.{lang => jl}
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class C1 extends jl.Enum[C1] // error: class C1 cannot extend java.lang.Enum
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class C2(name: String, ordinal: Int) extends jl.Enum[C2](name, ordinal) // error: class C2 cannot extend java.lang.Enum
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trait T extends jl.Enum[T] // error: trait T cannot extend java.lang.Enum

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