From 5776967a2a9986d52a34e2c3604ed662ed47e21f Mon Sep 17 00:00:00 2001
From: Daniel Wagner-Hall <dwagnerhall@apple.com>
Date: Tue, 1 Feb 2022 15:29:42 -0500
Subject: [PATCH] Deduplicate input to ctx.expand_location (#1118)

Works around https://github.com/bazelbuild/bazel/issues/14681
---
 rust/private/rustc.bzl | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/rust/private/rustc.bzl b/rust/private/rustc.bzl
index 3e2f38e355..c3b3247031 100644
--- a/rust/private/rustc.bzl
+++ b/rust/private/rustc.bzl
@@ -628,7 +628,9 @@ def construct_arguments(
     rustc_flags.add_all(rust_std_paths, before_each = "-L", format_each = "%s")
     rustc_flags.add_all(rust_flags)
 
-    data_paths = getattr(attr, "data", []) + getattr(attr, "compile_data", [])
+    # Deduplicate data paths due to https://github.com/bazelbuild/bazel/issues/14681
+    data_paths = depset(direct = getattr(attr, "data", []) + getattr(attr, "compile_data", [])).to_list()
+
     rustc_flags.add_all(
         expand_list_element_locations(
             ctx,