fix: usestate modify panic

packages/hooks/src/usestate.rs

@@ -39,16 +39,17 @@ 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();
+                {
+                    let mut slot = slot.borrow_mut();
 
-                // if there's only one reference (weak or otherwise), we can just swap the values
+                    // if there's only one reference (weak or otherwise), we can just swap the values
-                // Typically happens when the state is set multiple times - we don't want to create a new Rc for each new value
+                    // Typically happens when the state is set multiple times - we don't want to create a new Rc for each new value
-                if let Some(val) = Rc::get_mut(&mut slot) {
+                    if let Some(val) = Rc::get_mut(&mut slot) {
-                    *val = new;
+                        *val = new;
-                } else {
+                    } else {
-                    *slot = Rc::new(new);
+                        *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 current = self.slot.borrow();
+        let new_val = {
-        let new_val = f(current.as_ref());
+            let current = self.slot.borrow();
+            f(current.as_ref())
+        };
         (self.setter)(new_val);
     }