fix

Author: ShrigmaDev

Diff for: library/std/src/sync/poison/rwlock.rs

@@ -921,11 +921,11 @@ impl<'a, T: ?Sized> RwLockReadGuard<'a, T> {
         }
     }
 
-    pub fn try_upgrade<T>(orig: Self) -> Result<RwLockWriteGuard<'a, T>, RwLockReadGuard<'a, T>> {
-        read_lock = orig.inner_lock;
+    pub fn try_upgrade(orig: Self) -> Result<RwLockWriteGuard<'a, T>, RwLockReadGuard<'a, T>> {
+        let read_lock = orig.inner_lock;
 
         // don't call the destructor
-        forget(read_lock);
+        forget(orig);
 
         // SAFETY: We have ownership of the read guard, so it must be in read mode already
         match unsafe { read_lock.try_upgrade() } {

Diff for: library/std/src/sys/sync/rwlock/futex.rs

@@ -1,5 +1,3 @@
-use std::sync::atomic::Ordering::{Acquire, Relaxed};
-
 use crate::sync::atomic::Ordering::{Acquire, Relaxed, Release};
 use crate::sys::futex::{Futex, Primitive, futex_wait, futex_wake, futex_wake_all};