From 9d71daec1b9322035cba67a1d86c1660cd0fa91b Mon Sep 17 00:00:00 2001
From: Atif Aziz <code@raboof.com>
Date: Wed, 17 Mar 2021 22:36:10 +0100
Subject: [PATCH] Fix dictionary bug when null key has null value

---
 MoreLinq.Test/ScanByTest.cs        | 15 +++++++++++++++
 MoreLinq/Collections/Dictionary.cs |  2 +-
 2 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/MoreLinq.Test/ScanByTest.cs b/MoreLinq.Test/ScanByTest.cs
index 7a11a698b..ab5098389 100644
--- a/MoreLinq.Test/ScanByTest.cs
+++ b/MoreLinq.Test/ScanByTest.cs
@@ -115,6 +115,21 @@ public void ScanByWithSomeNullKeys()
                 KeyValuePair.Create("foo"       , 1));
         }
 
+        [Test]
+        public void ScanByWithNullSeed()
+        {
+            var nil = (object)null;
+            var source = new[] { "foo", null, "bar", null, "baz" };
+            var result = source.ScanBy(c => c, k => nil, (i, k, e) => nil);
+
+            result.AssertSequenceEqual(
+                KeyValuePair.Create("foo"       , nil),
+                KeyValuePair.Create((string)null, nil),
+                KeyValuePair.Create("bar"       , nil),
+                KeyValuePair.Create((string)null, nil),
+                KeyValuePair.Create("baz"       , nil));
+        }
+
         [Test]
         public void ScanByDoesNotIterateUnnecessaryElements()
         {
diff --git a/MoreLinq/Collections/Dictionary.cs b/MoreLinq/Collections/Dictionary.cs
index 796fee0b5..ef2bf08ab 100644
--- a/MoreLinq/Collections/Dictionary.cs
+++ b/MoreLinq/Collections/Dictionary.cs
@@ -56,7 +56,7 @@ public bool TryGetValue(TKey key, [MaybeNullWhen(false)] out TValue value)
             {
                 switch (_null)
                 {
-                    case (true, {} v):
+                    case (true, var v):
                         value = v;
                         return true;
                     case (false, _):