Rollup merge of #121224 - hi-rustin:rustin-patch-unit-binding, r=Mark-Simulacrum

Remove unnecessary unit binding

It appears that the unit binding is not necessary at this time. However, I am unsure of its importance in the past. Please let me know if it is unsafe to remove.

library/alloc/src/raw_vec.rs

@@ -261,7 +261,7 @@ fn current_memory(&self) -> Option<(NonNull<u8>, Layout)> {
             // and could hypothetically handle differences between stride and size, but this memory
             // has already been allocated so we know it can't overflow and currently rust does not
             // support such types. So we can do better by skipping some checks and avoid an unwrap.
-            let _: () = const { assert!(mem::size_of::<T>() % mem::align_of::<T>() == 0) };
+            const { assert!(mem::size_of::<T>() % mem::align_of::<T>() == 0) };
             unsafe {
                 let align = mem::align_of::<T>();
                 let size = mem::size_of::<T>().unchecked_mul(self.cap.0);
@@ -465,7 +465,7 @@ fn shrink(&mut self, cap: usize) -> Result<(), TryReserveError> {
 
         let (ptr, layout) = if let Some(mem) = self.current_memory() { mem } else { return Ok(()) };
         // See current_memory() why this assert is here
-        let _: () = const { assert!(mem::size_of::<T>() % mem::align_of::<T>() == 0) };
+        const { assert!(mem::size_of::<T>() % mem::align_of::<T>() == 0) };
 
         // If shrinking to 0, deallocate the buffer. We don't reach this point
         // for the T::IS_ZST case since current_memory() will have returned