merge revision(s) 57137: [Backport #13043]
eval.c: fix circular cause * eval.c (exc_setup_cause): always set cause of cause to get rid
of circular references. [ruby-core:78688] [Bug #13043]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_2@57222 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
merge revision(s) 57137: [Backport #13043]
of circular references. [ruby-core:78688] [Bug #13043]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_2@57222 b2dd03c8-39d4-4d8f-98ff-823fe69b080e