Fix doctest
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@@ -13,6 +13,7 @@ declare_lint! {
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///
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///
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/// ```rust
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/// ```rust
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/// # #![allow(unused)]
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/// # #![allow(unused)]
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/// # use std::ffi::CString;
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/// let c_str = CString::new("foo").unwrap().as_ptr();
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/// let c_str = CString::new("foo").unwrap().as_ptr();
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/// ```
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/// ```
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///
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///
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