Delegate to `eql?` [Fix GH-1564]

* lib/delegate.rb (eql?): Delegate to `eql?` of the inner object.
  based on the patch by giginet <giginet.net@gmail.com>.
  [ruby-core:76950] [Bug #12684]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@59167 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 9 insertions, 1 deletions

diff --git a/lib/delegate.rb b/lib/delegate.rb
index fa70848134..c5a94a5d31 100644
--- a/lib/delegate.rb
+++ b/lib/delegate.rb
@@ -40,7 +40,7 @@ class Delegator < BasicObject
   kernel = ::Kernel.dup
   kernel.class_eval do
     alias __raise__ raise
-    [:to_s, :inspect, :=~, :!~, :===, :<=>, :eql?, :hash].each do |m|
+    [:to_s, :inspect, :=~, :!~, :===, :<=>, :hash].each do |m|
       undef_method m
     end
     private_instance_methods.each do |m|
@@ -146,6 +146,14 @@ class Delegator < BasicObject
   end
 
   #
+  # Returns true if two objects are considered of equal value.
+  #
+  def eql?(obj)
+    return true if obj.equal?(self)
+    obj.eql?(__getobj__)
+  end
+
+  #
   # Delegates ! to the \_\_getobj\_\_
   #
   def !