merge revision(s) 579645d9: [Backport #17033]
Fixed infinite loop at error in printing cause [Bug #17033]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_6@67913 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
merge revision(s) 579645d9: [Backport #17033]
Fixed infinite loop at error in printing cause [Bug #17033]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_6@67913 b2dd03c8-39d4-4d8f-98ff-823fe69b080e