Add new &Module parameter to native functions.

doc/src/engine/call-fn.md

@@ -56,19 +56,20 @@ let result: () = engine.call_fn(&mut scope, &ast, "hidden", ())?;
 ```
 
 
-`Engine::call_fn_dynamic`
-------------------------
+Low-Level API - `Engine::call_fn_dynamic`
+----------------------------------------
 
 For more control, construct all arguments as `Dynamic` values and use `Engine::call_fn_dynamic`, passing it
-anything that implements `IntoIterator<Item = Dynamic>` (such as a simple `Vec<Dynamic>`):
+anything that implements `AsMut<Dynamic>` (such as a simple array or a `Vec<Dynamic>`):
 
 ```rust
-let result: Dynamic = engine.call_fn_dynamic(
-                            &mut scope,     // scope to use
-                            &ast,           // AST to use
-                            "hello",        // function entry-point
-                            None,           // 'this' pointer, if any
-                            [ String::from("abc").into(), 123_i64.into() ])?;   // arguments
+let result = engine.call_fn_dynamic(
+                        &mut scope,         // scope to use
+                        ast.into(),         // get 'Module' from 'AST'
+                        "hello",            // function entry-point
+                        None,               // 'this' pointer, if any
+                        [ String::from("abc").into(), 123_i64.into() ]      // arguments
+             )?;
 ```
 
 
@@ -82,8 +83,13 @@ let ast = engine.compile("fn action(x) { this += x; }")?;
 
 let mut value: Dynamic = 1_i64.into();
 
-let result = engine.call_fn_dynamic(&mut scope, &ast, "action", Some(&mut value), [ 41_i64.into() ])?;
-//                                                              ^^^^^^^^^^^^^^^^ binding the 'this' pointer
+let result = engine.call_fn_dynamic(
+                        &mut scope,
+                        ast.into(),
+                        "action",
+                        Some(&mut value),   // binding the 'this' pointer
+                        [ 41_i64.into() ]
+             )?;
 
 assert_eq!(value.as_int().unwrap(), 42);
 ```