https://git.ruby-lang.org/ruby.git/commit/?id=6a7af800db

From 6a7af800dbd45946caaadfc4a1212fc523afe58b Mon Sep 17 00:00:00 2001
From: aycabta <aycabta@g...>
Date: Wed, 11 Dec 2019 11:36:21 +0900
Subject: Add a message for CompatibilityError


diff --git a/lib/reline/line_editor.rb b/lib/reline/line_editor.rb
index 2abe659..928b043 100644
--- a/lib/reline/line_editor.rb
+++ b/lib/reline/line_editor.rb
@@ -550,7 +550,7 @@ class Reline::LineEditor https://github.com/ruby/ruby/blob/trunk/lib/reline/line_editor.rb#L550
     preposing, target, postposing = retrieve_completion_block
     list = list.select { |i|
       if i and not Encoding.compatible?(target.encoding, i.encoding)
-        raise Encoding::CompatibilityError
+        raise Encoding::CompatibilityError, "#{target.encoding.name} is not comaptible with #{i.encoding.name}"
       end
       if @config.completion_ignore_case
         i&.downcase.start_with?(target.downcase)
-- 
cgit v0.10.2


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