debug.rb: Fix debug listing
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@40450 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
debug.rb: Fix debug listing
same file it has been required. patch by Dario Bertini [Bug #8318] [fix GH-280]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@40450 b2dd03c8-39d4-4d8f-98ff-823fe69b080e