Make comment about dummy type a bit more clear
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@ -600,7 +600,8 @@ impl<'tcx> rustc_serialize::UseSpecializedDecodable for Ty<'tcx> {}
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pub type CanonicalTy<'tcx> = Canonical<'tcx, Ty<'tcx>>;
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extern {
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/// A dummy type used to force `List` to by unsized without requiring fat pointers.
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/// A dummy type used to force List to be unsized while not requiring references to it be wide
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/// pointers.
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type OpaqueListContents;
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}
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