diff --git a/bazel/rust_toolchain.bzl b/bazel/rust_toolchain.bzl
index 794f89b..97c7314 100644
--- a/bazel/rust_toolchain.bzl
+++ b/bazel/rust_toolchain.bzl
@@ -1,7 +1,7 @@
-def _required_path(repository_ctx, command):
-    path = repository_ctx.which(command)
+def _require(repository_ctx, executable):
+    path = repository_ctx.which(executable)
     if path == None:
-        fail("{} must be available in PATH. Enter the rust dev shell first.".format(command))
+        fail("{} must be available in PATH.".format(executable))
     return path
 
 
@@ -13,13 +13,13 @@ def _execute(repository_ctx, arguments):
 
 
 def _rust_repository_impl(repository_ctx):
-    rustc = _required_path(repository_ctx, "rustc")
-    rustdoc = _required_path(repository_ctx, "rustdoc")
-    cargo = _required_path(repository_ctx, "cargo")
-    cargo_clippy = _required_path(repository_ctx, "cargo-clippy")
-    clippy_driver = _required_path(repository_ctx, "clippy-driver")
-    rustfmt = _required_path(repository_ctx, "rustfmt")
-    cc = _required_path(repository_ctx, "cc")
+    rustc = _require(repository_ctx, "rustc")
+    rustdoc = _require(repository_ctx, "rustdoc")
+    cargo = _require(repository_ctx, "cargo")
+    cargo_clippy = _require(repository_ctx, "cargo-clippy")
+    clippy_driver = _require(repository_ctx, "clippy-driver")
+    rustfmt = _require(repository_ctx, "rustfmt")
+    cc = _require(repository_ctx, "cc")
 
     sysroot = _execute(repository_ctx, [str(rustc), "--print", "sysroot"])
     verbose_version = _execute(repository_ctx, [str(rustc), "-vV"])