fix position of enabling feature

Author: Aandreba

library/std/src/lib.rs

@@ -409,9 +409,9 @@
 #![feature(edition_panic)]
 #![feature(format_args_nl)]
 #![feature(log_syntax)]
+#![feature(nonpoison_mutex)]
 #![feature(test)]
 #![feature(trace_macros)]
-#![feature(nonpoison_mutex)]
 // tidy-alphabetical-end
 //
 // Only used in tests/benchmarks:

library/std/src/sync/nonpoison/mutex.rs

@@ -219,13 +219,7 @@ impl<T: ?Sized> Mutex<T> {
     /// ```
     #[unstable(feature = "nonpoison_mutex", issue = "134645")]
     pub fn try_lock(&self) -> Option<MutexGuard<'_, T>> {
-        unsafe {
-            if self.inner.try_lock() {
-                Some(MutexGuard::new(self))
-            } else {
-                None
-            }
-        }
+        unsafe { if self.inner.try_lock() { Some(MutexGuard::new(self)) } else { None } }
     }
 
     /// Consumes this mutex, returning the underlying data.