From 3026c32ea38bc5942d72b23b7640deff0a2f6042 Mon Sep 17 00:00:00 2001
From: vitalyd <vitalyd@gmail.com>
Date: Tue, 23 Jul 2019 11:06:31 -0400
Subject: [PATCH] Use empty dictionary instead of None for kwargs

Fixes https://github.com/bazelbuild/rules_rust/issues/243
---
 rust/private/rustc.bzl | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/rust/private/rustc.bzl b/rust/private/rustc.bzl
index 6b44e2f02d..7856ab8356 100644
--- a/rust/private/rustc.bzl
+++ b/rust/private/rustc.bzl
@@ -146,7 +146,7 @@ def _get_linker_and_args(ctx, rpaths):
         "ctx": ctx,
     } if len(BAZEL_VERSION) == 0 or versions.is_at_least(
         "0.25.0", BAZEL_VERSION
-    ) else None
+    ) else {}
     feature_configuration = cc_common.configure_features(
         cc_toolchain = cc_toolchain,
         requested_features = ctx.features,