Made a change in context to the way arrays are resized. Slight change to the logic but resize_with should be slightly more efficient

src/context/context.rs

@@ -330,16 +330,15 @@ impl Context {
     /// Return the file descriptor number or None if the slot was not empty, or i was invalid
     pub fn insert_file(&self, i: FileHandle, file: FileDescriptor) -> Option<FileHandle> {
         let mut files = self.files.write();
-        if i.get() < super::CONTEXT_MAX_FILES {
-            while i.get() >= files.len() {
-                files.push(None);
-            }
-            if files[i.get()].is_none() {
-                files[i.get()] = Some(file);
-                Some(i)
-            } else {
-                None
-            }
+        if i.get() >= super::CONTEXT_MAX_FILES {
+            return None;
+        }
+        if i.get() >= files.len() {
+            files.resize_with(i.get() + 1, || None);
+        }
+        if files[i.get()].is_none() {
+            files[i.get()] = Some(file);
+            Some(i)
         } else {
             None
         }