Add a trivial 2023 edition test case for Rust.

PiperOrigin-RevId: 588874094

rust/test/BUILD

@@ -180,6 +180,32 @@ rust_upb_proto_library(
     deps = [":dots_in_package_proto"],
 )
 
+proto_library(
+    name = "edition2023_proto",
+    testonly = True,
+    srcs = ["edition2023.proto"],
+)
+
+cc_proto_library(
+    name = "edition2023_cc_proto",
+    testonly = True,
+    deps = [":edition2023_proto"],
+)
+
+rust_cc_proto_library(
+    name = "edition2023_cc_rust_proto",
+    testonly = True,
+    visibility = ["//rust/test/shared:__subpackages__"],
+    deps = [":edition2023_cc_proto"],
+)
+
+rust_upb_proto_library(
+    name = "edition2023_upb_rust_proto",
+    testonly = True,
+    visibility = ["//rust/test/shared:__subpackages__"],
+    deps = [":edition2023_proto"],
+)
+
 proto_library(
     name = "no_package_import_proto",
     testonly = True,

rust/test/edition2023.proto

@@ -0,0 +1,8 @@
+edition = "2023";
+
+package test;
+
+message EditionsMessage {
+  int32 plain_field = 1;
+  int32 implicit_presence_field = 2 [features.field_presence = IMPLICIT];
+}

rust/test/shared/BUILD

@@ -68,6 +68,32 @@ rust_test(
     ],
 )
 
+rust_test(
+    name = "edition2023_cpp_test",
+    srcs = ["edition2023_test.rs"],
+    tags = [
+        # TODO: Enable testing on arm once we support sanitizers for Rust on Arm.
+        "not_build:arm",
+    ],
+    deps = [
+        "@crate_index//:googletest",
+        "//rust/test:edition2023_cc_rust_proto",
+    ],
+)
+
+rust_test(
+    name = "edition2023_upb_test",
+    srcs = ["edition2023_test.rs"],
+    tags = [
+        # TODO: Enable testing on arm once we support sanitizers for Rust on Arm.
+        "not_build:arm",
+    ],
+    deps = [
+        "@crate_index//:googletest",
+        "//rust/test:edition2023_upb_rust_proto",
+    ],
+)
+
 rust_test(
     name = "package_cpp_test",
     srcs = ["package_test.rs"],

rust/test/shared/edition2023_test.rs

@@ -0,0 +1,23 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2023 Google LLC.  All rights reserved.
+//
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file or at
+// https://developers.google.com/open-source/licenses/bsd
+
+use googletest::prelude::*;
+
+// Tests that an proto file that declares edition="2023" works. Note that this
+// is _not_ a test for Rust Edition 2023 (which doesn't exist) but instead
+// Protobuf Edition 2023 (which exists).
+
+#[test]
+fn check_edition2023_works() {
+    let mut msg = edition2023_proto::test::EditionsMessage::new();
+
+    // plain_field supports presence.
+    assert_that!(msg.plain_field_mut().or_default().get(), eq(0));
+
+    // implicit presence fields' _mut() skips FieldEntry.
+    assert_that!(msg.implicit_presence_field_mut().get(), eq(0));
+}