# System.Collections.Immutable

``` diff
 namespace System.Collections.Immutable {
     public static class ImmutableSortedDictionary {
-        public static ImmutableSortedDictionary<TKey, TValue> ToImmutableSortedDictionary<TKey, TValue>(this ImmutableSortedDictionary<TKey, TValue>.Builder source);
+        public static ImmutableSortedDictionary<TKey, TValue> ToImmutableSortedDictionary<TKey, TValue>(this ImmutableSortedDictionary<TKey, TValue>.Builder builder);
     }
 }
```

