Add missing feature gate in multiple_supertrait_upcastable doc
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@ -10,6 +10,7 @@ declare_lint! {
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/// ### Example
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/// ### Example
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///
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///
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/// ```rust
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/// ```rust
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/// #![feature(multiple_supertrait_upcastable)]
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/// trait A {}
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/// trait A {}
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/// trait B {}
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/// trait B {}
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///
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///
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