chore(core): remove deprecated upgrades

Related #3647.

Pull-Request: #3867.

core/CHANGELOG.md

@@ -3,7 +3,11 @@
 - Raise MSRV to 1.65.
   See [PR 3715].
 
+- Remove deprecated symbols related to upgrades.
+  See [PR 3867].
+
 [PR 3715]: https://github.com/libp2p/rust-libp2p/pull/3715
+[PR 3867]: https://github.com/libp2p/rust-libp2p/pull/3867
 
 ## 0.39.2
 

core/src/upgrade.rs

@@ -61,18 +61,13 @@ mod apply;
 mod denied;
 mod either;
 mod error;
-mod from_fn;
-mod map;
-mod optional;
 mod pending;
 mod ready;
 mod select;
 mod transfer;
 
 use futures::future::Future;
 
-#[allow(deprecated)]
-pub use self::from_fn::{from_fn, FromFnUpgrade};
 pub use self::{
     apply::{apply, apply_inbound, apply_outbound, InboundUpgradeApply, OutboundUpgradeApply},
     denied::DeniedUpgrade,
@@ -83,11 +78,7 @@ pub use self::{
     transfer::{read_length_prefixed, read_varint, write_length_prefixed, write_varint},
 };
 pub use crate::Negotiated;
-#[allow(deprecated)]
-pub use map::{MapInboundUpgrade, MapInboundUpgradeErr, MapOutboundUpgrade, MapOutboundUpgradeErr};
 pub use multistream_select::{NegotiatedComplete, NegotiationError, ProtocolError, Version};
-#[allow(deprecated)]
-pub use optional::OptionalUpgrade;
 
 /// Types serving as protocol names.
 ///
@@ -164,35 +155,6 @@ pub trait InboundUpgrade<C>: UpgradeInfo {
     fn upgrade_inbound(self, socket: C, info: Self::Info) -> Self::Future;
 }
 
-/// Extension trait for `InboundUpgrade`. Automatically implemented on all types that implement
-/// `InboundUpgrade`.
-#[deprecated(
-    note = "Will be removed without replacement because it is not used within rust-libp2p."
-)]
-#[allow(deprecated)]
-pub trait InboundUpgradeExt<C>: InboundUpgrade<C> {
-    /// Returns a new object that wraps around `Self` and applies a closure to the `Output`.
-    fn map_inbound<F, T>(self, f: F) -> MapInboundUpgrade<Self, F>
-    where
-        Self: Sized,
-        F: FnOnce(Self::Output) -> T,
-    {
-        MapInboundUpgrade::new(self, f)
-    }
-
-    /// Returns a new object that wraps around `Self` and applies a closure to the `Error`.
-    fn map_inbound_err<F, T>(self, f: F) -> MapInboundUpgradeErr<Self, F>
-    where
-        Self: Sized,
-        F: FnOnce(Self::Error) -> T,
-    {
-        MapInboundUpgradeErr::new(self, f)
-    }
-}
-
-#[allow(deprecated)]
-impl<C, U: InboundUpgrade<C>> InboundUpgradeExt<C> for U {}
-
 /// Possible upgrade on an outbound connection or substream.
 pub trait OutboundUpgrade<C>: UpgradeInfo {
     /// Output after the upgrade has been successfully negotiated and the handshake performed.
@@ -208,32 +170,3 @@ pub trait OutboundUpgrade<C>: UpgradeInfo {
     /// The `info` is the identifier of the protocol, as produced by `protocol_info`.
     fn upgrade_outbound(self, socket: C, info: Self::Info) -> Self::Future;
 }
-
-/// Extention trait for `OutboundUpgrade`. Automatically implemented on all types that implement
-/// `OutboundUpgrade`.
-#[deprecated(
-    note = "Will be removed without replacement because it is not used within rust-libp2p."
-)]
-#[allow(deprecated)]
-pub trait OutboundUpgradeExt<C>: OutboundUpgrade<C> {
-    /// Returns a new object that wraps around `Self` and applies a closure to the `Output`.
-    fn map_outbound<F, T>(self, f: F) -> MapOutboundUpgrade<Self, F>
-    where
-        Self: Sized,
-        F: FnOnce(Self::Output) -> T,
-    {
-        MapOutboundUpgrade::new(self, f)
-    }
-
-    /// Returns a new object that wraps around `Self` and applies a closure to the `Error`.
-    fn map_outbound_err<F, T>(self, f: F) -> MapOutboundUpgradeErr<Self, F>
-    where
-        Self: Sized,
-        F: FnOnce(Self::Error) -> T,
-    {
-        MapOutboundUpgradeErr::new(self, f)
-    }
-}
-
-#[allow(deprecated)]
-impl<C, U: OutboundUpgrade<C>> OutboundUpgradeExt<C> for U {}