https://git.ruby-lang.org/ruby.git/commit/?id=aa9a38c0ed

From aa9a38c0ed114edded28a2a26e8dd507f7e1547f Mon Sep 17 00:00:00 2001
From: Koichi Sasada <ko1@a...>
Date: Tue, 3 Mar 2020 15:27:23 +0900
Subject: Ignore incompatible convert of symbols


diff --git a/lib/irb/completion.rb b/lib/irb/completion.rb
index 10533c5..7277bf5 100644
--- a/lib/irb/completion.rb
+++ b/lib/irb/completion.rb
@@ -101,6 +101,8 @@ module IRB https://github.com/ruby/ruby/blob/trunk/lib/irb/completion.rb#L101
           sym = $1
           candidates = Symbol.all_symbols.collect do |s|
             ":" + s.id2name.encode(Encoding.default_external)
+          rescue Encoding::UndefinedConversionError
+            # ignore
           end
           candidates.grep(/^#{Regexp.quote(sym)}/)
         else
-- 
cgit v0.10.2


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