Re-sync with internal repository (#16)

Co-authored-by: Facebook Community Bot <[email protected]>

Author: facebook-github-bot

shim/BUCK

@@ -0,0 +1,33 @@
+"""Copied from prelude since we need to put this file under shim/
+"""
+
+load("@prelude//toolchains:cxx.bzl", "system_cxx_toolchain")
+load("@prelude//toolchains:genrule.bzl", "system_genrule_toolchain")
+load("@prelude//toolchains:python.bzl", "system_python_bootstrap_toolchain", "system_python_toolchain")
+load("@prelude//toolchains:rust.bzl", "system_rust_toolchain")
+
+system_cxx_toolchain(
+    name = "cxx",
+    visibility = ["PUBLIC"],
+)
+
+system_genrule_toolchain(
+    name = "genrule",
+    visibility = ["PUBLIC"],
+)
+
+system_rust_toolchain(
+    name = "rust",
+    default_edition = "2021",
+    visibility = ["PUBLIC"],
+)
+
+system_python_toolchain(
+    name = "python",
+    visibility = ["PUBLIC"],
+)
+
+system_python_bootstrap_toolchain(
+    name = "python_bootstrap",
+    visibility = ["PUBLIC"],
+)