From ba81bc24e62d03cc0f4c05cf4e2b378696631568 Mon Sep 17 00:00:00 2001
From: Masataka Pocke Kuwabara <kuwabara@pocke.me>
Date: Fri, 10 Jul 2020 07:01:10 +0900
Subject: Add instance_methods to class generated by DelegateClass

Also, make DelegateClass.instance_method fallback to superclass.

Fixes [Bug #16982]
---
 lib/delegate.rb | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

(limited to 'lib')

diff --git a/lib/delegate.rb b/lib/delegate.rb
index d6fb90bdbf..a1fded6425 100644
--- a/lib/delegate.rb
+++ b/lib/delegate.rb
@@ -422,6 +422,21 @@ def DelegateClass(superclass, &block)
   klass.define_singleton_method :protected_instance_methods do |all=true|
     super(all) | superclass.protected_instance_methods
   end
+  klass.define_singleton_method :instance_methods do |all=true|
+    super(all) | superclass.instance_methods
+  end
+  klass.define_singleton_method :public_instance_method do |name|
+    super(name)
+  rescue NameError
+    raise unless self.public_instance_methods.include?(name)
+    superclass.public_instance_method(name)
+  end
+  klass.define_singleton_method :instance_method do |name|
+    super(name)
+  rescue NameError
+    raise unless self.instance_methods.include?(name)
+    superclass.instance_method(name)
+  end
   klass.module_eval(&block) if block
   return klass
 end
-- 
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