Upgrade rules_rust to 0.63.0 so that we can build with Bazel 9 prereleases

acozzette · copybara-github · commit 141ccd67d933 · 2025-08-07T14:26:26.000-07:00
I tried building `//rust/...` with the most recent Bazel 9 prerelease and found
that it succeeds once we upgrade rules_rust. This is not critically important,
but it seems nice to be able to try out Bazel 9 in advance.

Unfortunately we can't upgrade rules_rust in WORKSPACE without breaking
workspace builds, but I think this is probably fine since that is already
deprecated anyway. It's also broken on Bazel 8, so presumably we will drop
support for Rust WORKSPACE builds entirely once we drop Bazel 7.

PiperOrigin-RevId: 792307568
diff --git a/MODULE.bazel b/MODULE.bazel
@@ -54,7 +54,7 @@ bazel_dep(name = "rules_python", version = "1.4.1")
 # rules_proto is needed for @com_google_protobuf_v25 used in //compatibility/... tests
 bazel_dep(name = "rules_proto", version = "7.1.0")
 
-bazel_dep(name = "rules_rust", version = "0.56.0", dev_dependency = True)
+bazel_dep(name = "rules_rust", version = "0.63.0", dev_dependency = True)
 bazel_dep(name = "rules_ruby", version = "0.17.3", dev_dependency = True)
 
 # Workaround for https://github.com/bazelbuild/bazel-central-registry/issues/4230
diff --git a/WORKSPACE b/WORKSPACE
@@ -249,6 +249,8 @@ load("@fuzzing_py_deps//:requirements.bzl", fuzzing_py_deps_install_deps = "inst
 
 fuzzing_py_deps_install_deps()
 
+# This version of rules_rust is older than the one in MODULE.bazel, but we
+# cannot upgrade any further without breaking the WORKSPACE-based build.
 http_archive(
     name = "rules_rust",
     integrity = "sha256-8TBqrAsli3kN8BrZq8arsN8LZUFsdLTvJ/Sqsph4CmQ=",
