From cfb9f6a3c00d4943a3bc7248a873b643746e0d24 Mon Sep 17 00:00:00 2001
From: qunyanm <unknown>
Date: Thu, 16 Apr 2015 11:09:24 -0700
Subject: Change GetHashCode for Set, MultiSet and Map

---
 Binaries/DafnyRuntime.cs | 20 +++++++++++++++++---
 1 file changed, 17 insertions(+), 3 deletions(-)

(limited to 'Binaries')

diff --git a/Binaries/DafnyRuntime.cs b/Binaries/DafnyRuntime.cs
index a682422a..2a553c81 100644
--- a/Binaries/DafnyRuntime.cs
+++ b/Binaries/DafnyRuntime.cs
@@ -75,7 +75,11 @@ namespace Dafny
       return other is Set<T> && Equals((Set<T>)other);
     }
     public override int GetHashCode() {
-      return dict.GetHashCode();
+      var hashCode = 0;
+      foreach (var t in dict.Keys) {
+        hashCode = (hashCode << 3) | (hashCode >> 29) ^ t.GetHashCode();
+      }
+      return hashCode;
     }
     public override string ToString() {
       var s = "{";
@@ -228,7 +232,12 @@ namespace Dafny
       return other is MultiSet<T> && Equals((MultiSet<T>)other);
     }
     public override int GetHashCode() {
-      return dict.GetHashCode();
+      var hashCode = 0;
+      foreach (var kv in dict) {
+        hashCode = (hashCode << 3) | (hashCode >> 29) ^ kv.Key.GetHashCode();
+        hashCode = (hashCode << 3) | (hashCode >> 29) ^ kv.Value.GetHashCode();
+      }
+      return hashCode;
     }
     public override string ToString() {
       var s = "multiset{";
@@ -392,7 +401,12 @@ namespace Dafny
       return other is Map<U, V> && Equals((Map<U, V>)other);
     }
     public override int GetHashCode() {
-      return dict.GetHashCode();
+      var hashCode = 0;
+      foreach (var kv in dict) {
+        hashCode = (hashCode << 3) | (hashCode >> 29) ^ kv.Key.GetHashCode();
+        hashCode = (hashCode << 3) | (hashCode >> 29) ^ kv.Value.GetHashCode();
+      }
+      return hashCode;
     }
     public override string ToString() {
       var s = "map[";
-- 
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