don't emit overwriting warnings for term_expansion/2 or goal_expansion/2

src/prolog/machine/mod.rs

@@ -150,8 +150,16 @@ impl SubModuleUser for IndexStore {
     fn insert_dir_entry(&mut self, name: ClauseName, arity: usize, idx: CodeIndex) {
         if let Some(ref code_idx) = self.code_dir.get(&(name.clone(), arity)) {
             if !code_idx.is_undefined() {
+                match (name.as_str(), arity) {
+                    ("term_expansion", 2) => {
+                    }
+                    ("goal_expansion", 2) => {
+                    }
+                    _ => {
                         println!("Warning: overwriting {}/{}", &name, arity);
                     }
+                }
+            }
 
             let (p, module_name) = idx.0.borrow().clone();
             set_code_index!(code_idx, p, module_name);

src/prolog/machine/term_expansion.rs

@@ -380,7 +380,7 @@ impl MachineState {
 
             self.reset_with_heap_preservation();
 
-            Some(output.result()))
+            Some(output.result())
         }
     }
 }