From 3c6629cee45cd5d5d4afc7bcd210c8d95f639cca Mon Sep 17 00:00:00 2001
From: CyrusNajmabadi <cyrusn@microsoft.com>
Date: Fri, 11 Nov 2016 11:52:24 -0800
Subject: [PATCH] Weaken cast.

---
 src/Compilers/Core/Portable/Syntax/SyntaxTriviaList.cs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/Compilers/Core/Portable/Syntax/SyntaxTriviaList.cs b/src/Compilers/Core/Portable/Syntax/SyntaxTriviaList.cs
index d02af683249..c542f427f17 100644
--- a/src/Compilers/Core/Portable/Syntax/SyntaxTriviaList.cs
+++ b/src/Compilers/Core/Portable/Syntax/SyntaxTriviaList.cs
@@ -255,8 +255,8 @@ public SyntaxTriviaList InsertRange(int index, IEnumerable<SyntaxTrivia> trivia)
                 throw new ArgumentNullException(nameof(trivia));
             }
 
-            // Handle common case where we're passed an empty array.
-            var triviaList = trivia as IList<SyntaxTrivia>;
+            // Just return ourselves if we're not being asked to add anything.
+            var triviaList = trivia as ICollection;
             if (triviaList.Count == 0)
             {
                 return this;
-- 
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