Add return type to function metadata.

src/ast.rs

@@ -89,7 +89,7 @@ impl fmt::Display for ScriptFnDef {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         write!(
             f,
-            "{}{}({})",
+            "{}{}({}) -> Dynamic",
             if self.access.is_private() {
                 "private "
             } else {
@@ -151,6 +151,7 @@ impl AST {
         &mut self.0
     }
     /// Get the internal shared [`Module`] containing all script-defined functions.
+    #[cfg(not(feature = "no_function"))]
     #[inline(always)]
     pub(crate) fn shared_lib(&self) -> Shared<Module> {
         self.1.clone()