test: fix the one `loom` model that still uses `with`

oops

Signed-off-by: Eliza Weisman <eliza@buoyant.io>

src/mpsc.rs

@@ -223,12 +223,12 @@ impl<T, N: Notify> core::ops::DerefMut for SendRefInner<'_, T, N> {
 
 impl<T, N: Notify> SendRefInner<'_, T, N> {
     #[inline]
-    pub fn with<U>(&self, f: impl FnOnce(&T) -> U) -> U {
+    pub(crate) fn with<U>(&self, f: impl FnOnce(&T) -> U) -> U {
         self.slot.with(f)
     }
 
     #[inline]
-    pub fn with_mut<U>(&mut self, f: impl FnOnce(&mut T) -> U) -> U {
+    pub(crate) fn with_mut<U>(&mut self, f: impl FnOnce(&mut T) -> U) -> U {
         self.slot.with_mut(f)
     }
 }

src/mpsc/tests/mpsc_sync.rs

@@ -29,7 +29,7 @@ fn mpsc_try_send_recv() {
         let mut vals = Vec::new();
 
         for val in &rx {
-            val.with(|val| vals.push(*val));
+            vals.push(*val);
         }
 
         vals.sort_unstable();