Cleanup.

src/eval/cache.rs

@@ -44,44 +44,39 @@ impl FnResolutionCache {
 /// The following caches are contained inside this type:
 /// * A stack of [function resolution caches][FnResolutionCache]
 #[derive(Debug, Clone)]
-pub struct Caches {
-    /// Stack of [function resolution caches][FnResolutionCache].
-    stack: StaticVec<FnResolutionCache>,
-}
+pub struct Caches(StaticVec<FnResolutionCache>);
 
 impl Caches {
     /// Create an empty [`Caches`].
     #[inline(always)]
     #[must_use]
     pub const fn new() -> Self {
-        Self {
-            stack: StaticVec::new_const(),
-        }
+        Self(StaticVec::new_const())
     }
     /// Get the number of function resolution cache(s) in the stack.
     #[inline(always)]
     #[must_use]
     pub fn fn_resolution_caches_len(&self) -> usize {
-        self.stack.len()
+        self.0.len()
     }
     /// Get a mutable reference to the current function resolution cache.
     #[inline]
     #[must_use]
     pub fn fn_resolution_cache_mut(&mut self) -> &mut FnResolutionCache {
-        if self.stack.is_empty() {
+        if self.0.is_empty() {
             // Push a new function resolution cache if the stack is empty
             self.push_fn_resolution_cache();
         }
-        self.stack.last_mut().unwrap()
+        self.0.last_mut().unwrap()
     }
     /// Push an empty function resolution cache onto the stack and make it current.
     #[inline(always)]
     pub fn push_fn_resolution_cache(&mut self) {
-        self.stack.push(Default::default());
+        self.0.push(Default::default());
     }
     /// Rewind the function resolution caches stack to a particular size.
     #[inline(always)]
     pub fn rewind_fn_resolution_caches(&mut self, len: usize) {
-        self.stack.truncate(len);
+        self.0.truncate(len);
     }
 }