Delete MappedOwnedMutexGuard in preference for tokio::sync::MappedMut…

…exGuard MappedOwnedMutexGuard had an (as of yet unused) undefined behaviour case in its implementation of map_mut. This has been superceded by tokio's tokio-rs/tokio#2472 which used a better implementation without undefined behaviour (using UnsafeCell instead).
microsoft · Jul 13, 2021 · 2e15285 · 2e15285
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diff --git a/snocat/src/util/mapped_owned_async_mutex.rs b/snocat/src/util/mapped_owned_async_mutex.rs
diff --git a/snocat/src/util/mod.rs b/snocat/src/util/mod.rs
@@ -20,12 +20,10 @@ use tokio::net::TcpStream;
 pub mod cancellation;
 pub mod dropkick;
 pub mod framed;
-mod mapped_owned_async_mutex;
 pub(crate) mod merge_streams;
 pub mod tunnel_stream;
 pub mod validators;
 pub(crate) mod vtdroppable;
-pub use mapped_owned_async_mutex::MappedOwnedMutexGuard;
 
 // HTTP protocol constant from quinn/examples/common
 pub const ALPN_QUIC_HTTP: &[&[u8]] = &[b"hq-29"];