Also worthwhile mentioning is functionalC [0]. The blog mentioned on the Github page is down but the relevant URLs can be accessed from the wayback machine at

Also worthwhile mentioning is functionalC [0]. The blog mentioned on the Github page is down but the relevant URLs can be accessed from the wayback machine at [1] and [2]. GCC also supports nested functions [3] (as a GNU C extension). Unrelated, but [4] specifies a pure C implementation of Go channels and libmill [5] is a library that introduces Go-style concurrency to C. [0] https://github.com/cioc/functionalC https://github.com/cioc/functionalC [1] https://web.archive.org/web/20160406001106/http://blog.charlescary.com/?p=95 https://web.archive.org/web/20160406001106/http://blog.charl... [2] https://web.archive.org/web/20160304120857/http://blog.charlescary.com/?p=150 https://web.archive.org/web/20160304120857/http://blog.charl... [3] http://gcc.gnu.org/onlinedocs/gcc/Nested-Functions.html http://gcc.gnu.org/onlinedocs/gcc/Nested-Functions.html [4] https://github.com/tylertreat/chan https://github.com/tylertreat/chan [5] https://github.com/sustrik/libmill https://github.com/sustrik/libmill