Add internals feature.

src/parser.rs

@@ -65,20 +65,34 @@ impl AST {
     }
 
     /// Get the statements.
+    #[cfg(not(feature = "internals"))]
     pub(crate) fn statements(&self) -> &Vec<Stmt> {
         &self.0
     }
 
+    /// Get the statements.
+    #[cfg(feature = "internals")]
+    pub fn statements(&self) -> &Vec<Stmt> {
+        &self.0
+    }
+
     /// Get a mutable reference to the statements.
     pub(crate) fn statements_mut(&mut self) -> &mut Vec<Stmt> {
         &mut self.0
     }
 
-    /// Get the script-defined functions.
+    /// Get the internal `Module` containing all script-defined functions.
+    #[cfg(not(feature = "internals"))]
     pub(crate) fn lib(&self) -> &Module {
         &self.1
     }
 
+    /// Get the internal `Module` containing all script-defined functions.
+    #[cfg(feature = "internals")]
+    pub fn lib(&self) -> &Module {
+        &self.1
+    }
+
     /// Merge two `AST` into one.  Both `AST`'s are untouched and a new, merged, version
     /// is returned.
     ///