From 418973b0fd03a5b792f7a0a39f4999e6461d40a2 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Andreas=20B=C3=BChmann?= <dev@uuml.de>
Date: Tue, 22 Oct 2019 09:42:06 +0200
Subject: [PATCH] Work around JRuby bug

---
 lib/rubocop/config_validator.rb | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lib/rubocop/config_validator.rb b/lib/rubocop/config_validator.rb
index 5a28ee6ec2b..8f0aece3fab 100644
--- a/lib/rubocop/config_validator.rb
+++ b/lib/rubocop/config_validator.rb
@@ -131,7 +131,9 @@ def validate_parameter_names(valid_cop_names)
           next if COMMON_PARAMS.include?(param) || default_config.key?(param)
 
           supported_params = default_config.keys - INTERNAL_PARAMS
-          warn Rainbow(<<~MESSAGE).yellow
+          # FIXME: Remove .to_s, which works around a JRuby bug:
+          #   https://github.com/jruby/jruby/issues/5935
+          warn Rainbow(<<~MESSAGE).yellow.to_s
             Warning: #{name} does not support #{param} parameter.
 
             Supported parameters are: