dbbc042786
See http://www.open-std.org/jtc1/sc22/WG14/www/docs/n1256.pdf 6.4.6§3. Note: This is not exactly the upstream Universal CTags commit because it depends on another change for adding the `enter` label, which was then included here. X-Universal-CTags-Commit-ID: 3b3b60c7664a321a31ec87de336fc6bda90c405e