Adjust the protobuf prelude.

Export the traits with a `Proto` prefix on them to minimize collisions (especially the high risk of confusing collision with the std prelude's AsMut).

Remove Message, MessageMut and MessageView from the prelude.

PiperOrigin-RevId: 691388401

conformance/conformance_rust.rs

@@ -8,7 +8,7 @@ use conformance_rust_proto::{ConformanceRequest, ConformanceResponse, WireFormat
 
 use protobuf::prelude::*;
 use protobuf::Optional::{Set, Unset};
-use protobuf::ParseError;
+use protobuf::{Message, ParseError};
 
 use std::io::{self, ErrorKind, Read, Write};
 use test_messages_edition2023_rust_proto::TestAllTypesEdition2023;

rust/prelude.rs

@@ -6,11 +6,18 @@
 // https://developers.google.com/open-source/licenses/bsd
 
 //! Prelude for the Protobuf Rust API.
-//! This module contains only non-struct items that are needed for extremely
-//! common usages of the generated types from application code. Any struct
-//! or less common items should be imported normally.
+//!
+//! This module contains only the proto! macro and traits which define very
+//! common fns that on messages (fns that would be methods on a base class in
+//! other languages).
+//!
+//! All traits here have `Proto` prefixed on them, as the intent of this prelude
+//! is to make the methods callable on message instances: if the traits are
+//! named for generic reasons, they should be explicitly imported from the
+//! `protobuf::` crate instead.
 
 pub use crate::{
-    proto, AsMut, AsView, Clear, ClearAndParse, IntoMut, IntoView, MergeFrom, Message, MessageMut,
-    MessageView, Parse, Serialize,
+    proto, AsMut as ProtoAsMut, AsView as ProtoAsView, Clear as ProtoClear,
+    ClearAndParse as ProtoClearAndParse, IntoMut as ProtoIntoMut, IntoView as ProtoIntoView,
+    MergeFrom as ProtoMergeFrom, Parse as ProtoParse, Serialize as ProtoSerialize,
 };