Fix C# Pair.cs, #1634.

runtime/CSharp/runtime/CSharp/Antlr4.Runtime/Misc/Pair.cs

@@ -2,48 +2,48 @@
  * Use of this file is governed by the BSD 3-clause license that
  * can be found in the LICENSE.txt file in the project root.
  */
-
 using System;
+
 namespace Antlr4.Runtime.Misc
 {
-
 	public class Pair<A, B>
 	{
-	public readonly A a;
-	public readonly B b;
+		public readonly A a;
+		public readonly B b;
 
-	public Pair(A a, B b)
-	{
-		this.a = a;
-		this.b = b;
-	}
-
-	public override bool Equals(Object obj)
-	{
-		if (obj == this)
+		public Pair(A a, B b)
 		{
-			return true;
-		}
-		else if (!(obj is Pair<A, B>)) {
-			return false;
+			this.a = a;
+			this.b = b;
 		}
 
-		Pair <A, B> other = (Pair <A, B>)obj;
-			return a==null ? other.a==null : a.Equals(other.b);
-	}
+		public override bool Equals(Object obj)
+		{
+			if (obj == this)
+			{
+				return true;
+			}
+			else if (!(obj is Pair<A, B>))
+			{
+				return false;
+			}
 
-	public override int GetHashCode()
-	{
-		int hash = MurmurHash.Initialize();
-		hash = MurmurHash.Update(hash, a);
-		hash = MurmurHash.Update(hash, b);
-		return MurmurHash.Finish(hash, 2);
-	}
+			Pair<A, B> other = (Pair<A, B>)obj;
+			return (a == null ? other.a == null : a.Equals(other.a)) &&
+				   (b == null ? other.b == null : b.Equals(other.b));
+		}
 
-	public override String ToString()
-	{
-		return String.Format("(%s, %s)", a, b);
-	}
-}
+		public override int GetHashCode()
+		{
+			int hash = MurmurHash.Initialize();
+			hash = MurmurHash.Update(hash, a);
+			hash = MurmurHash.Update(hash, b);
+			return MurmurHash.Finish(hash, 2);
+		}
 
-}
+		public override String ToString()
+		{
+			return String.Format("({0}, {1})", a, b);
+		}
+	}
+}