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t5093.scala:2: error: illegal cyclic reference involving type C
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def f[C[X] <: C[X]](l: C[_]) = l.x
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t5093.scala:2: error: cyclic aliasing or subtyping involving type C
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def f[C[X] <: C[X]](l: C[_]) = l.x
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t5093.scala:2: error: C does not take type parameters
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def f[C[X] <: C[X]](l: C[_]) = l.x