Fix sync build.

src/dynamic.rs

@@ -1195,18 +1195,24 @@ impl Dynamic {
         match self.0 {
             Union::Shared(_, _) => match crate::stdlib::mem::take(self).0 {
                 Union::Shared(cell, _) => {
-                    let value = crate::fn_native::shared_take_or_clone(cell);
+                    *self = crate::fn_native::shared_try_take(cell).map_or_else(
-
+                        |cell| {
                             #[cfg(not(feature = "sync"))]
-                    {
+                            let value = cell.borrow();
-                        *self = value.into_inner();
-                    }
                             #[cfg(feature = "sync")]
-                    {
+                            let value = cell.read().unwrap();
-                        *self = value.into_inner().unwrap();
+
+                            value.clone()
+                        },
+                        |value| {
+                            #[cfg(not(feature = "sync"))]
+                            return value.into_inner();
+                            #[cfg(feature = "sync")]
+                            return value.into_inner().unwrap();
+                        },
+                    )
                 }
-                }
+                _ => unreachable!("self should be Shared"),
-                _ => unreachable!(),
             },
             _ => (),
         }

src/engine.rs

@@ -405,8 +405,8 @@ impl<'a> Target<'a> {
             Self::LockGuard((r, _)) => **r = new_val,
             Self::Value(_) => panic!("cannot update a value"),
             #[cfg(not(feature = "no_index"))]
-            Self::StringChar(string, index, _) if string.is::<ImmutableString>() => {
+            Self::StringChar(s, index, _) if s.is::<ImmutableString>() => {
-                let mut s = string.write_lock::<ImmutableString>().unwrap();
+                let mut s = s.write_lock::<ImmutableString>().unwrap();
 
                 // Replace the character at the specified index position
                 let new_ch = new_val.as_char().map_err(|err| {
@@ -426,7 +426,10 @@ impl<'a> Target<'a> {
                 }
             }
             #[cfg(not(feature = "no_index"))]
-            Self::StringChar(_, _, _) => unreachable!(),
+            Self::StringChar(s, _, _) => unreachable!(
+                "Target::StringChar should contain only a string, not {}",
+                s.type_name()
+            ),
         }
 
         Ok(())

src/serde/metadata.rs

@@ -147,7 +147,7 @@ impl From<&crate::module::FuncInfo> for FnMetadata {
             doc_comments: if info.func.is_script() {
                 #[cfg(feature = "no_function")]
                 {
-                    unreachable!()
+                    unreachable!("scripted functions should not exist under no_function")
                 }
                 #[cfg(not(feature = "no_function"))]
                 {