Ruby » Ruby master

merge revision(s) 57194: [Backport #13074]

    vm_eval.c: Symbol#to_proc and instance_exec

    * vm_eval.c (yield_under): should evaluate the proc on the first
      argument.  [ruby-core:78839] [Bug #13074]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_4@57834 b2dd03c8-39d4-4d8f-98ff-823fe69b080e