Implement function pointers.

doc/src/about/features.md

@@ -35,6 +35,8 @@ Dynamic
 
 * Organize code base with dynamically-loadable [modules].
 
+* [Function pointers].
+
 Safe
 ----
 

doc/src/about/non-design.md

@@ -11,10 +11,13 @@ It doesn't attempt to be a new language. For example:
 * No traits...  so it is also not Rust. Do your Rusty stuff in Rust.
 
 * No structures/records - define your types in Rust instead; Rhai can seamlessly work with _any Rust type_.
+
   There is, however, a built-in [object map] type which is adequate for most uses.
 
 * No first-class functions - Code your functions in Rust instead, and register them with Rhai.
 
+  There is, however, support for simple [function pointers] allowing runtime dispatch by function name.
+
 * No garbage collection - this should be expected, so...
 
 * No closures - do your closure magic in Rust instead; [turn a Rhai scripted function into a Rust closure]({{rootUrl}}/engine/call-fn.md).