Refine function call parameters size.

src/scope.rs

@@ -420,7 +420,7 @@ impl<'a> Scope<'a> {
     /// Clone the Scope, keeping only the last instances of each variable name.
     /// Shadowed variables are omitted in the copy.
     #[inline]
-    pub(crate) fn flatten_clone(&self) -> Self {
+    pub(crate) fn clone_visible(&self) -> Self {
         let mut entries: Vec<Entry> = Default::default();
 
         self.0.iter().rev().for_each(|entry| {
@@ -488,6 +488,12 @@ impl<'a> Scope<'a> {
              }| { (name.as_ref(), typ.is_constant(), value) },
         )
     }
+
+    /// Get a mutable iterator to entries in the Scope.
+    #[inline(always)]
+    pub(crate) fn iter_mut(&mut self) -> impl Iterator<Item = &mut Entry<'a>> {
+        self.0.iter_mut()
+    }
 }
 
 impl<'a, K: Into<Cow<'a, str>>> iter::Extend<(K, EntryType, Dynamic)> for Scope<'a> {