refactor: use unsafe for get_mut from ref

y-octo/src/doc/common/somr.rs

@@ -132,7 +132,7 @@ impl<T> Somr<T> {
         inner.data.as_mut().map(|x| x.get_mut())
     }
 
-    pub fn get_mut_from_ref(&self) -> Option<InnerRefMut<T>> {
+    pub unsafe fn get_mut_from_ref(&self) -> Option<InnerRefMut<T>> {
         if !self.is_owned() || self.dangling() {
             return None;
         }
@@ -141,7 +141,6 @@ impl<T> Somr<T> {
         inner.data_mut()
     }
 
-    #[allow(clippy::mut_from_ref)]
     pub unsafe fn get_mut_unchecked(&self) -> InnerRefMut<'_, T> {
         if self.dangling() {
             panic!("Try to visit Somr data that has already been dropped.")
@@ -417,7 +416,7 @@ mod tests {
 
             // only owner can mut ref
             assert!(five_ref.get().is_some());
-            assert!(five_ref.get_mut_from_ref().is_none());
+            assert!(unsafe { five_ref.get_mut_from_ref() }.is_none());
 
             drop(five);
         });
@@ -490,7 +489,9 @@ mod tests {
     fn test_inner_mut() {
         let five = Somr::new(5);
         fn add(a: &Somr<i32>, b: &Somr<i32>) {
-            a.get_mut_from_ref().map(|mut x| *x += *b.get().unwrap()).unwrap();
+            unsafe { a.get_mut_from_ref() }
+                .map(|mut x| *x += *b.get().unwrap())
+                .unwrap();
         }
 
         add(&five, &five);