Add test that ensures rust protos build with reserved keywords

Also confirmed that this fails to build without the `r#` inside singular_scalar.cc

PiperOrigin-RevId: 546906226

rust/test/BUILD

@@ -175,3 +175,35 @@ rust_upb_proto_library(
     ],
     deps = [":no_package_proto"],
 )
+
+proto_library(
+    name = "reserved_proto",
+    testonly = True,
+    srcs = ["reserved.proto"],
+)
+
+cc_proto_library(
+    name = "reserved_cc_proto",
+    testonly = True,
+    deps = [":reserved_proto"],
+)
+
+rust_cc_proto_library(
+    name = "reserved_cc_rust_proto",
+    testonly = True,
+    visibility = [
+        "//rust/test/cpp:__subpackages__",
+        "//rust/test/shared:__subpackages__",
+    ],
+    deps = [":reserved_cc_proto"],
+)
+
+rust_upb_proto_library(
+    name = "reserved_upb_rust_proto",
+    testonly = True,
+    visibility = [
+        "//rust/test/shared:__subpackages__",
+        "//rust/test/upb:__subpackages__",
+    ],
+    deps = [":reserved_proto"],
+)

rust/test/reserved.proto

@@ -0,0 +1,37 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2023 Google LLC.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google LLC. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+syntax = "proto2";
+
+package naming;
+
+message Reserved {
+  optional int32 for = 1; // for is a reserved word in rust, let's make sure we can compile it
+}

rust/test/shared/BUILD

@@ -54,6 +54,24 @@ rust_test(
     ],
 )
 
+rust_test(
+    name = "reserved_cpp_test",
+    srcs = ["reserved_test.rs"],
+    deps = [
+        "//rust/test:reserved_cc_rust_proto",
+        "//rust/test:unittest_cc_rust_proto",
+    ],
+)
+
+rust_test(
+    name = "reserved_upb_test",
+    srcs = ["reserved_test.rs"],
+    deps = [
+        "//rust/test:reserved_upb_rust_proto",
+        "//rust/test:unittest_upb_rust_proto",
+    ],
+)
+
 rust_test(
     name = "nested_messages_cpp_test",
     srcs = ["nested_messages_test.rs"],

rust/test/shared/reserved_test.rs

@@ -0,0 +1,39 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2023 Google LLC.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google LLC. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+/// Test covering proto compilation with reserved words.
+use reserved_proto::naming::Reserved;
+
+#[test]
+fn test_reserved_keyword_in_accessors() {
+    let msg = Reserved::new();
+    let res = msg.r#for();
+    assert_eq!(res, 0);
+}