From c1c527c290727b3a5d9565f69f1fe3496cbd401b Mon Sep 17 00:00:00 2001
From: knu <knu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Sat, 21 Oct 2017 16:28:52 +0000
Subject: [PATCH] Fix comparison methods of Set to check if `@hash` is actually
 comparable

This should fix comparison of rbtree backed SortedSet instances.
[Bug #12072]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@60312 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 lib/set.rb | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/lib/set.rb b/lib/set.rb
index caf80aa930..05eb3ffb2a 100644
--- a/lib/set.rb
+++ b/lib/set.rb
@@ -237,7 +237,7 @@ class Set
   # Returns true if the set is a superset of the given set.
   def superset?(set)
     case
-    when set.instance_of?(self.class)
+    when set.instance_of?(self.class) && @hash.respond_to?(:>=)
       @hash >= set.instance_variable_get(:@hash)
     when set.is_a?(Set)
       size >= set.size && set.all? { |o| include?(o) }
@@ -250,7 +250,7 @@ class Set
   # Returns true if the set is a proper superset of the given set.
   def proper_superset?(set)
     case
-    when set.instance_of?(self.class)
+    when set.instance_of?(self.class) && @hash.respond_to?(:>)
       @hash > set.instance_variable_get(:@hash)
     when set.is_a?(Set)
       size > set.size && set.all? { |o| include?(o) }
@@ -263,7 +263,7 @@ class Set
   # Returns true if the set is a subset of the given set.
   def subset?(set)
     case
-    when set.instance_of?(self.class)
+    when set.instance_of?(self.class) && @hash.respond_to?(:<=)
       @hash <= set.instance_variable_get(:@hash)
     when set.is_a?(Set)
       size <= set.size && all? { |o| set.include?(o) }
@@ -276,7 +276,7 @@ class Set
   # Returns true if the set is a proper subset of the given set.
   def proper_subset?(set)
     case
-    when set.instance_of?(self.class)
+    when set.instance_of?(self.class) && @hash.respond_to?(:<)
       @hash < set.instance_variable_get(:@hash)
     when set.is_a?(Set)
       size < set.size && all? { |o| set.include?(o) }