Better function parameter names.

src/fn_call.rs

@@ -611,7 +611,7 @@ impl Engine {
         hashes: FnCallHashes,
         args: &mut FnCallArgs,
         is_ref_mut: bool,
-        _is_method_call: bool,
+        is_method_call: bool,
         pos: Position,
         _capture_scope: Option<Scope>,
         _level: usize,
@@ -625,6 +625,8 @@ impl Engine {
         #[cfg(not(feature = "no_closure"))]
         ensure_no_data_race(fn_name, args, is_ref_mut)?;
 
+        let _is_method_call = is_method_call;
+
         // These may be redirected from method style calls.
         match fn_name {
             // Handle type_of()