https://git.ruby-lang.org/ruby.git/commit/?id=16cf2ef6f2

From 16cf2ef6f2ad61fbbf613f87c9038f3a6af4fc15 Mon Sep 17 00:00:00 2001
From: aycabta <aycabta@g...>
Date: Tue, 31 Aug 2021 04:26:41 +0900
Subject: [ruby/irb] Don't show doc when pointer is negative

https://github.com/ruby/irb/commit/48af34bfc2
---
 lib/irb/input-method.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/irb/input-method.rb b/lib/irb/input-method.rb
index 725d142..5fe248d 100644
--- a/lib/irb/input-method.rb
+++ b/lib/irb/input-method.rb
@@ -323,7 +323,7 @@ module IRB https://github.com/ruby/ruby/blob/trunk/lib/irb/input-method.rb#L323
         return nil
       end
       cursor_pos_to_render, result, pointer = context.pop(3)
-      return nil if result.nil? or pointer.nil?
+      return nil if result.nil? or pointer.nil? or pointer < 0
       name = result[pointer]
       name = IRB::InputCompletor.retrieve_completion_data(name, doc_namespace: true)
 
-- 
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