https://git.ruby-lang.org/ruby.git/commit/?id=bf8d7d9c1d

From bf8d7d9c1d89a62537566ea6dd43db175a892dbd Mon Sep 17 00:00:00 2001
From: Koichi Sasada <ko1@a...>
Date: Mon, 30 Sep 2019 15:35:22 +0900
Subject: show RUBY_ISEQ_DUMP_DEBUG envval if given.


diff --git a/tool/lib/iseq_loader_checker.rb b/tool/lib/iseq_loader_checker.rb
index 1a1a694..e7cfc79 100644
--- a/tool/lib/iseq_loader_checker.rb
+++ b/tool/lib/iseq_loader_checker.rb
@@ -38,8 +38,10 @@ class RubyVM::InstructionSequence https://github.com/ruby/ruby/blob/trunk/tool/lib/iseq_loader_checker.rb#L38
     i2
   end
 
-  CHECK_TO_A      = ENV['RUBY_ISEQ_DUMP_DEBUG'] == 'to_a'
-  CHECK_TO_BINARY = ENV['RUBY_ISEQ_DUMP_DEBUG'] == 'to_binary'
+  opt = ENV['RUBY_ISEQ_DUMP_DEBUG']
+  puts "RUBY_ISEQ_DUMP_DEBUG = #{opt}" if opt
+  CHECK_TO_A      = 'to_a'      == opt
+  CHECK_TO_BINARY = 'to_binary' == opt
 
   def self.translate i1
     # check to_a/load_iseq
-- 
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