Move raw_cargo into private package

MODULE.bazel

@@ -9,7 +9,7 @@ bazel_dep(name = "bazel_skylib", version = "1.2.0")
 bazel_dep(name = "apple_support", version = "0.13.0")
 
 # Load tinyjson without using the process wrapper
-raw_cargo = use_extension("//:extensions.bzl", "raw_cargo")
+raw_cargo = use_extension("//rust/private:extensions.bzl", "raw_cargo")
 
 raw_cargo.crate(
     name = "tinyjson",

extensions.bzl

@@ -1,7 +1,6 @@
 "Module extensions for using rules_rust with bzlmod"
 
 load("//rust:repositories.bzl", "rust_register_toolchains")
-load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
 
 def _toolchains_impl(ctx):
     mod = ctx.modules[0]
@@ -13,33 +12,3 @@ toolchains = module_extension(
     implementation = _toolchains_impl,
     tag_classes = {"toolchain": toolchains_toolchain},
 )
-
-def _create_build_file_content(name):
-    return """
-load("@rules_rust//rust/private:rust.bzl", "rust_library_without_process_wrapper")
-
-rust_library_without_process_wrapper(
-    name = "{}",
-    srcs = glob(["src/*.rs"]),
-    edition = "2018",
-    visibility = ["@rules_rust//util/process_wrapper:__pkg__"],
-)
-""".format(name)
-
-def _raw_cargo_impl(ctx):
-    for mod in ctx.modules:
-        for crate in mod.tags.crate:
-            http_archive(
-                name = "raw_cargo_{}_{}".format(crate.name, crate.version.replace(".", "_")),
-                sha256 = crate.sha256,
-                url = "https://crates.io/api/v1/crates/{}/{}/download".format(crate.name, crate.version),
-                strip_prefix = "{}-{}".format(crate.name, crate.version),
-                type = "tar.gz",
-                build_file_content = _create_build_file_content(crate.name),
-            )
-
-raw_cargo_crate = tag_class(attrs = {"name": attr.string(), "version": attr.string(), "sha256": attr.string()})
-raw_cargo = module_extension(
-    implementation = _raw_cargo_impl,
-    tag_classes = {"crate": raw_cargo_crate},
-)

rust/private/extensions.bzl

@@ -0,0 +1,31 @@
+load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
+
+def _create_build_file_content(name):
+    return """
+load("@rules_rust//rust/private:rust.bzl", "rust_library_without_process_wrapper")
+
+rust_library_without_process_wrapper(
+    name = "{}",
+    srcs = glob(["src/*.rs"]),
+    edition = "2018",
+    visibility = ["@rules_rust//util/process_wrapper:__pkg__"],
+)
+""".format(name)
+
+def _raw_cargo_impl(ctx):
+    for mod in ctx.modules:
+        for crate in mod.tags.crate:
+            http_archive(
+                name = "raw_cargo_{}_{}".format(crate.name, crate.version.replace(".", "_")),
+                sha256 = crate.sha256,
+                url = "https://crates.io/api/v1/crates/{}/{}/download".format(crate.name, crate.version),
+                strip_prefix = "{}-{}".format(crate.name, crate.version),
+                type = "tar.gz",
+                build_file_content = _create_build_file_content(crate.name),
+            )
+
+raw_cargo_crate = tag_class(attrs = {"name": attr.string(), "version": attr.string(), "sha256": attr.string()})
+raw_cargo = module_extension(
+    implementation = _raw_cargo_impl,
+    tag_classes = {"crate": raw_cargo_crate},
+)