fix: usestate modify panic

packages/hooks/src/usestate.rs

@@ -39,6 +39,7 @@ pub fn use_state<'a, T: 'static>(
         let setter = Rc::new({
             crate::to_owned![update_callback, slot];
             move |new| {
+                {
                     let mut slot = slot.borrow_mut();
 
                     // if there's only one reference (weak or otherwise), we can just swap the values
@@ -48,7 +49,7 @@ pub fn use_state<'a, T: 'static>(
                     } else {
                         *slot = Rc::new(new);
                     }
-
+                }
                 update_callback();
             }
         });
@@ -153,8 +154,10 @@ impl<T: 'static> UseState<T> {
     /// }
     /// ```
     pub fn modify(&self, f: impl FnOnce(&T) -> T) {
+        let new_val = {
             let current = self.slot.borrow();
-        let new_val = f(current.as_ref());
+            f(current.as_ref())
+        };
         (self.setter)(new_val);
     }