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+//! Types which are documented locally in the Tokio crate, but does not actually
+//! live here.
+//!
+//! **Note** this module is only visible on docs.rs, you cannot use it directly
+//! in your own code.
+
+/// The name of a type which is not defined here.
+///
+/// This is typically used as an alias for another type, like so:
+///
+/// ```rust,ignore
+/// /// See [some::other::location](https://example.com).
+/// type DEFINED_ELSEWHERE = crate::doc::NotDefinedHere;
+/// ```
+///
+/// This type is uninhabitable like the [`never` type] to ensure that no one
+/// will ever accidentally use it.
+///
+/// [`never` type]: https://doc.rust-lang.org/std/primitive.never.html
+pub enum NotDefinedHere {}
+
+pub mod os;
+pub mod winapi;