Fix tests.

src/eval/target.rs

@@ -239,6 +239,17 @@ impl<'a> Target<'a> {
             _ => None,
         }
     }
+    /// Convert a shared or reference [`Target`] into a target with an owned value.
+    #[inline(always)]
+    #[must_use]
+    pub fn into_owned(self) -> Self {
+        match self {
+            Self::RefMut(r) => Self::TempValue(r.clone()),
+            #[cfg(not(feature = "no_closure"))]
+            Self::SharedValue { value, .. } => Self::TempValue(value),
+            _ => self,
+        }
+    }
     /// Get the source [`Dynamic`] of the [`Target`].
     #[allow(dead_code)]
     #[inline]

src/func/call.rs

@@ -1234,9 +1234,13 @@ impl Engine {
                         .map(|(value, ..)| arg_values.push(value.flatten()))
                 })?;
 
-                let (target, _pos) =
+                let (mut target, _pos) =
                     self.search_namespace(scope, global, lib, this_ptr, first_expr, level)?;
 
+                if target.is_read_only() {
+                    target = target.into_owned();
+                }
+
                 self.track_operation(global, _pos)?;
 
                 #[cfg(not(feature = "no_closure"))]