Add test for constants to Scope::get_mut.
@@ -397,6 +397,9 @@ impl<'a> Scope<'a> {
/// *ptr = 123_i64.into();
///
/// assert_eq!(my_scope.get_value::<i64>("x").unwrap(), 123);
+ ///
+ /// my_scope.push_constant("Z", 1_i64);
+ /// assert!(my_scope.get_mut("Z").is_none());
/// ```
#[inline]
#[must_use]
