https://git.ruby-lang.org/ruby.git/commit/?id=cde84a5baa

From cde84a5baac7d854190d09a72bc8c4f40a6eb1ea Mon Sep 17 00:00:00 2001
From: aycabta <aycabta@g...>
Date: Sun, 29 Aug 2021 20:05:57 +0900
Subject: [ruby/irb] Rescue NotFoundError of RDoc::RI::Driver#expand_name

https://github.com/ruby/irb/commit/c5f13b23d7
---
 lib/irb/input-method.rb | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/lib/irb/input-method.rb b/lib/irb/input-method.rb
index 1e4132c..4d55e4e 100644
--- a/lib/irb/input-method.rb
+++ b/lib/irb/input-method.rb
@@ -323,7 +323,11 @@ module IRB https://github.com/ruby/ruby/blob/trunk/lib/irb/input-method.rb#L323
       name = result[pointer]
 
       driver = RDoc::RI::Driver.new
-      name = driver.expand_name(name)
+      begin
+        name = driver.expand_name(name)
+      rescue RDoc::RI::Driver::NotFoundError
+        return nil
+      end
       doc = nil
       used_for_class = false
       if not name =~ /#|\./
-- 
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