https://git.ruby-lang.org/ruby.git/commit/?id=dea600046a

From dea600046aa5895e745a8d655ff90616705e11a6 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Wed, 9 Dec 2020 13:10:28 +0900
Subject: Ad-hoc fix of test-bundler


diff --git a/spec/bundler/bundler/cli_spec.rb b/spec/bundler/bundler/cli_spec.rb
index 8e4f9e6..dc7d4a5 100644
--- a/spec/bundler/bundler/cli_spec.rb
+++ b/spec/bundler/bundler/cli_spec.rb
@@ -2,6 +2,16 @@ https://github.com/ruby/ruby/blob/trunk/spec/bundler/bundler/cli_spec.rb#L2
 
 require "bundler/cli"
 
+using Module.new {
+  # Some `man` (e.g., on macOS) always highlights the output even to
+  # non-tty.
+  refine Spec::Helpers do
+    def out
+      super.gsub(/.[\b]/, '')
+    end
+  end
+}
+
 RSpec.describe "bundle executable" do
   it "returns non-zero exit status when passed unrecognized options" do
     bundle "--invalid_argument", :raise_on_error => false
-- 
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