merge revision(s) 59644: [Backport #13836]
parse.y: primary should not be 0 * parse.y (primary): should not be 0, since it can be a receiver. [ruby-core:82447] [Bug #13836]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_3@59881 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
merge revision(s) 59644: [Backport #13836]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_3@59881 b2dd03c8-39d4-4d8f-98ff-823fe69b080e