https://git.ruby-lang.org/ruby.git/commit/?id=095e9f57af

From 095e9f57af30fc286ba66557d86f080003ab6d5a Mon Sep 17 00:00:00 2001
From: Yusuke Endoh <mame@r...>
Date: Sun, 22 Mar 2020 22:34:49 +0900
Subject: test/ruby/test_m17n.rb: Add a temporal code for debugging

http://ci.rvm.jp/logfiles/brlog.trunk-test-random.20200322-221411
```
I, [2020-03-22T22:15:50.761950 #23076]  INFO -- :   1) Error:
I, [2020-03-22T22:15:50.761963 #23076]  INFO -- : TestM17N#test_object_inspect_external:
I, [2020-03-22T22:15:50.761974 #23076]  INFO -- : Encoding::CompatibilityError: incompatible character encodings: UTF-8 and UTF-16BE
```

diff --git a/test/ruby/test_m17n.rb b/test/ruby/test_m17n.rb
index 6c7d0e6..c21f411 100644
--- a/test/ruby/test_m17n.rb
+++ b/test/ruby/test_m17n.rb
@@ -310,6 +310,36 @@ class TestM17N < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/ruby/test_m17n.rb#L310
     def o.inspect
       "abc".encode(Encoding.default_external)
     end
+
+    # debugging code for http://ci.rvm.jp/logfiles/brlog.trunk-test-random.20200322-221411
+    begin
+      "abc".encode(Encoding.default_external)
+    rescue Encoding::CompatibilityError
+      p :debug_1
+      p $!
+      p *$!.backtrace
+      p "abc".encoding
+      p Encoding.default_external
+    end
+    begin
+      [o].inspect
+    rescue Encoding::CompatibilityError
+      p :debug_2
+      p $!
+      p *$!.backtrace
+      p "abc".encoding
+      p Encoding.default_external
+      begin
+        p o.inspect
+        p :debug_3
+      rescue Encoding::CompatibilityError
+        p :debug_4
+        p $!
+        p *$!.backtrace
+      end
+    end
+    # debugging code end
+
     assert_equal '[abc]', [o].inspect
 
     Encoding.default_external = Encoding::US_ASCII
-- 
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