From b548784b4a31b49026b69849430a9ec9072ae94a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=8D=9C=E9=83=A8=E6=98=8C=E5=B9=B3?=
 <shyouhei@ruby-lang.org>
Date: Thu, 6 Aug 2020 22:21:10 +0900
Subject: do not undef =~ unless defined (#2149)

Undefining a nonexistent definition is an error in Ruby.  This has not been a problem because there always was `Object#=~` predefined.  But we are planning to delete that useless method.  This would become an error unless properly guarded.
---
 lib/pry/code.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'lib')

diff --git a/lib/pry/code.rb b/lib/pry/code.rb
index ad38b4f2..1fb206c4 100644
--- a/lib/pry/code.rb
+++ b/lib/pry/code.rb
@@ -339,7 +339,7 @@ class Pry
         super
       end
     end
-    undef =~
+    undef =~ if method_defined?(:=~)
 
     # Check whether String responds to missing methods.
     def respond_to_missing?(method_name, include_private = false)
-- 
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