Minor cleanup (#2357)

ffi/BUILD.bazel

diff --git a/ffi/BUILD.bazel b/ffi/BUILD.bazel
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/ffi/BUILD.bazel

rust/private/rust.bzl

diff --git a/rust/private/rust.bzl b/rust/private/rust.bzl
index 30c24fd..3e89d50 100644
--- a/rust/private/rust.bzl
+++ b/rust/private/rust.bzl
@@ -963,7 +963,9 @@
     # https://docs.bazel.build/versions/main/skylark/config.html#user-defined-transitions.
     attrs = dict(
         _common_attrs.items(),
-        _allowlist_function_transition = attr.label(default = Label("//tools/allowlists/function_transition_allowlist")),
+        _allowlist_function_transition = attr.label(
+            default = Label("//tools/allowlists/function_transition_allowlist"),
+        ),
         deps = attr.label_list(
             doc = dedent("""\
                 List of other libraries to be linked to this library target.

test/cc_common_link/unit/cc_common_link_test.bzl

diff --git a/test/cc_common_link/unit/cc_common_link_test.bzl b/test/cc_common_link/unit/cc_common_link_test.bzl
index 8b3c551..89b62bf 100644
--- a/test/cc_common_link/unit/cc_common_link_test.bzl
+++ b/test/cc_common_link/unit/cc_common_link_test.bzl
@@ -36,8 +36,13 @@
 use_cc_common_link_on_target = rule(
     implementation = _use_cc_common_link_on_target_impl,
     attrs = {
-        "target": attr.label(cfg = use_cc_common_link_transition, aspects = [collect_dep_actions_aspect]),
-        "_allowlist_function_transition": attr.label(default = "@bazel_tools//tools/allowlists/function_transition_allowlist"),
+        "target": attr.label(
+            cfg = use_cc_common_link_transition,
+            aspects = [collect_dep_actions_aspect],
+        ),
+        "_allowlist_function_transition": attr.label(
+            default = Label("@bazel_tools//tools/allowlists/function_transition_allowlist"),
+        ),
     },
 )
 

test/unit/force_all_deps_direct/generator.bzl

diff --git a/test/unit/force_all_deps_direct/generator.bzl b/test/unit/force_all_deps_direct/generator.bzl
index 6501b36..7286b64 100644
--- a/test/unit/force_all_deps_direct/generator.bzl
+++ b/test/unit/force_all_deps_direct/generator.bzl
@@ -6,21 +6,21 @@
 # buildifier: disable=bzl-visibility
 load("//rust/private:rustc.bzl", "rustc_compile_action")
 
-def _generator_impl(ctx):
-    rs_file = ctx.actions.declare_file(ctx.label.name + "_generated.rs")
-    ctx.actions.run_shell(
-        outputs = [rs_file],
-        command = """cat <<EOF > {}
+_TEMPLATE = """\
 use direct::direct_fn;
 use transitive::transitive_fn;
 
-pub fn call_both() {}
+pub fn call_both() {
     direct_fn();
     transitive_fn();
-{}
-EOF
-""".format(rs_file.path, "{", "}"),
-        mnemonic = "WriteRsFile",
+}
+"""
+
+def _generator_impl(ctx):
+    rs_file = ctx.actions.declare_file(ctx.label.name + "_generated.rs")
+    ctx.actions.write(
+        output = rs_file,
+        content = _TEMPLATE,
     )
 
     toolchain = ctx.toolchains[Label("//rust:toolchain_type")]
@@ -72,7 +72,10 @@
 generator = rule(
     implementation = _generator_impl,
     attrs = {
-        "deps": attr.label_list(),
+        "deps": attr.label_list(
+            doc = "List of other libraries to be linked to this library target.",
+            providers = [CrateInfo],
+        ),
         "_cc_toolchain": attr.label(
             default = Label("@bazel_tools//tools/cpp:current_cc_toolchain"),
         ),