merge revision(s) 59202: [Backport #13690]
compile.c: disallow next in once * compile.c (iseq_compile_each0): turned dregx context in "once" into "guarded" type from "block" type, to disallow `next`, `break`, `redo` as well as outside "once". [ruby-core:81805] [Bug #13690]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_4@59492 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
merge revision(s) 59202: [Backport #13690]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_4@59492 b2dd03c8-39d4-4d8f-98ff-823fe69b080e