Symbol: fixed equality test.

Author: ForNeVeR

Naggum.Runtime/Symbol.cs

@@ -16,15 +16,36 @@ public Symbol(String aName)
 
         bool IEquatable<Symbol>.Equals(Symbol other)
         {
-            return Name.Equals(other.Name);
+			return AreEqual(this, other);
         }
 
+		public override bool Equals(object obj)
+		{
+			var symbol = obj as Symbol;
+			if (symbol != null)
+			{
+				return AreEqual(this, symbol);
+			}
+
+			return false;
+		}
+
+		public override int GetHashCode()
+		{
+			return Name.GetHashCode();
+		}
+
         /// <summary>
         /// </summary>
         /// <returns>Returns symbol's name as string.</returns>
         public override string ToString()
         {
             return Name;
         }
+
+		private static bool AreEqual(Symbol one, Symbol other)
+		{
+			return one.Name.Equals(other.Name);
+		}
     }
 }