enable unstable open_options_ext_as_flags feature in doc comments
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@ -357,6 +357,7 @@ pub trait OpenOptionsExt {
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///
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/// ```no_run
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/// # #![feature(rustc_private)]
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/// #![feature(open_options_ext_as_flags)]
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/// extern crate libc;
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/// use std::ffi::CString;
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/// use std::fs::OpenOptions;
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