Merge pull request #2589 from MDoerner/ReworkParseCoordinatorPart1

Rework parse coordinator part1

Author: retailcoder

Rubberduck.Parsing/VBA/EnumerableExtensions.cs

@@ -20,5 +20,10 @@ public static IEnumerable<T> DistinctBy<T, TKey>(this IEnumerable<T> source, Fun
             var hashSet = new HashSet<TKey>();
             return source.Where(item => hashSet.Add(keySelector(item)));
         }
+
+        public static HashSet<T> ToHashSet<T>(this IEnumerable<T> source)
+        {
+            return new HashSet<T>(source);
+        }
     }
 }