From c616b4becd58b9e85bbb3488d38be0d31ab5447f Mon Sep 17 00:00:00 2001
From: Fabian Wolff <fwolff@google.com>
Date: Tue, 12 May 2026 04:39:19 -0700
Subject: [PATCH] Pass `allowed_unstable_rust_features` to
 `rustc_compile_action`.

PiperOrigin-RevId: 914211132
---
 rust/bazel/aspects.bzl | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/rust/bazel/aspects.bzl b/rust/bazel/aspects.bzl
index b7f233faca..3bb0cd1ef7 100644
--- a/rust/bazel/aspects.bzl
+++ b/rust/bazel/aspects.bzl
@@ -300,6 +300,9 @@ def _compile_rust(ctx, attr, src, extra_srcs, deps, aliases, runtime):
         srcs = depset([src] + extra_srcs)
 
     # TODO: Use higher level rules_rust API once available.
+    rustc_compile_action_extra_args = {}
+    if _rust_version_ge("0.70"):
+        rustc_compile_action_extra_args["allowed_unstable_rust_features"] = ["register_tool"]
     providers = rustc_compile_action(
         ctx = ctx,
         attr = attr,
@@ -326,6 +329,7 @@ def _compile_rust(ctx, attr, src, extra_srcs, deps, aliases, runtime):
             owner = ctx.label,
         ),
         output_hash = output_hash,
+        **rustc_compile_action_extra_args
     )
 
     return DepVariantInfo(