From a5af6e8ef4c7e1705a723bdeead6b802d4aedfdc Mon Sep 17 00:00:00 2001
From: commitay <commitay@users.noreply.github.com>
Date: Mon, 3 Sep 2018 18:59:53 +1000
Subject: [PATCH] formula: set `CARGO_HOME` to enable cache

---
 Library/Homebrew/formula.rb | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Library/Homebrew/formula.rb b/Library/Homebrew/formula.rb
index af2c449d7e..e1e5262fe0 100644
--- a/Library/Homebrew/formula.rb
+++ b/Library/Homebrew/formula.rb
@@ -1680,6 +1680,7 @@ class Formula
       HOMEBREW_PATH: nil,
       _JAVA_OPTIONS: "#{ENV["_JAVA_OPTIONS"]} -Duser.home=#{HOMEBREW_CACHE}/java_cache",
       GOCACHE: "#{HOMEBREW_CACHE}/go_cache",
+      CARGO_HOME: "#{HOMEBREW_CACHE}/cargo_cache",
     }
 
     ENV.clear_sensitive_environment!
@@ -2034,6 +2035,7 @@ class Formula
         stage_env[:_JAVA_OPTIONS] =
           "#{ENV["_JAVA_OPTIONS"]} -Duser.home=#{HOMEBREW_CACHE}/java_cache"
         stage_env[:GOCACHE] = "#{HOMEBREW_CACHE}/go_cache"
+        stage_env[:CARGO_HOME] = "#{HOMEBREW_CACHE}/cargo_cache"
         stage_env[:CURL_HOME] = ENV["CURL_HOME"] || ENV["HOME"]
       end