Fix no_index build.

src/engine.rs

@@ -338,6 +338,7 @@ impl ChainArgument {
     /// Return the [position][Position].
     #[inline(always)]
     #[must_use]
+    #[allow(dead_code)]
     pub const fn position(&self) -> Position {
         match self {
             #[cfg(not(feature = "no_object"))]

tests/get_set.rs

@@ -224,8 +224,10 @@ fn test_get_set_chain_without_write_back() -> Result<(), Box<EvalAltResult>> {
             "inner",
             |t: &mut Outer| t.inner.clone(),
             |_: &mut Outer, new: Inner| panic!("Outer::inner setter called with {:?}", new),
-        )
-        .register_indexer_get_set(
+        );
+
+    #[cfg(not(feature = "no_index"))]
+    engine.register_indexer_get_set(
         |t: &mut Outer, n: INT| Inner {
             value: t.inner.value * n,
         },
@@ -238,11 +240,16 @@ fn test_get_set_chain_without_write_back() -> Result<(), Box<EvalAltResult>> {
         engine.eval_with_scope::<INT>(&mut scope, "outer.inner.value")?,
         42
     );
+
+    #[cfg(not(feature = "no_index"))]
     assert_eq!(
         engine.eval_with_scope::<INT>(&mut scope, "outer[2].value")?,
         84
     );
+
     engine.consume_with_scope(&mut scope, "print(outer.inner.value)")?;
+
+    #[cfg(not(feature = "no_index"))]
     engine.consume_with_scope(&mut scope, "print(outer[0].value)")?;
 
     Ok(())