https://git.ruby-lang.org/ruby.git/commit/?id=91440ff13f

From 91440ff13fbf3b14dc6ac6c1e0a33bc5a1e3237c Mon Sep 17 00:00:00 2001
From: aycabta <aycabta@g...>
Date: Tue, 3 Mar 2020 14:40:45 +0900
Subject: Convert incompatible encoding symbol names


diff --git a/lib/irb/completion.rb b/lib/irb/completion.rb
index 7236747..10533c5 100644
--- a/lib/irb/completion.rb
+++ b/lib/irb/completion.rb
@@ -99,7 +99,9 @@ module IRB https://github.com/ruby/ruby/blob/trunk/lib/irb/completion.rb#L99
         return nil if doc_namespace
         if Symbol.respond_to?(:all_symbols)
           sym = $1
-          candidates = Symbol.all_symbols.collect{|s| ":" + s.id2name}
+          candidates = Symbol.all_symbols.collect do |s|
+            ":" + s.id2name.encode(Encoding.default_external)
+          end
           candidates.grep(/^#{Regexp.quote(sym)}/)
         else
           []
-- 
cgit v0.10.2


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