From 2931df37e70fd0a61d015237caac7527a61eb2f7 Mon Sep 17 00:00:00 2001
From: Bernhard Richter <bernhard.richter@gmail.com>
Date: Wed, 29 Nov 2017 21:34:58 +0100
Subject: [PATCH 1/2] Ensure that we don't load multiple compilation assemby
 versions

---
 src/OmniSharp.Script/ScriptProjectSystem.cs | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/src/OmniSharp.Script/ScriptProjectSystem.cs b/src/OmniSharp.Script/ScriptProjectSystem.cs
index ef8ca47ca8..a3caf9a9b8 100644
--- a/src/OmniSharp.Script/ScriptProjectSystem.cs
+++ b/src/OmniSharp.Script/ScriptProjectSystem.cs
@@ -112,10 +112,15 @@ public void Initalize(IConfiguration configuration)
             }
             else
             {
+                HashSet<string> loadedFiles = new HashSet<string>();
+
                 foreach (var compilationAssembly in compilationDependencies.SelectMany(cd => cd.AssemblyPaths).Distinct())
                 {
-                    _logger.LogDebug("Discovered script compilation assembly reference: " + compilationAssembly);
-                    AddMetadataReference(commonReferences, compilationAssembly);
+                    if (loadedFiles.Add(Path.GetFileName(compilationAssembly)))
+                    {
+                        _logger.LogDebug("Discovered script compilation assembly reference: " + compilationAssembly);
+                        AddMetadataReference(commonReferences, compilationAssembly);
+                    }
                 }
             }
 

From d9a6f70748053e13d80b9bda5896153e9c6b05ed Mon Sep 17 00:00:00 2001
From: Bernhard Richter <bernhard.richter@gmail.com>
Date: Wed, 29 Nov 2017 22:36:12 +0100
Subject: [PATCH 2/2] Make hashset for loaded compilation assemblies case
 insensitive

---
 src/OmniSharp.Script/ScriptProjectSystem.cs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/OmniSharp.Script/ScriptProjectSystem.cs b/src/OmniSharp.Script/ScriptProjectSystem.cs
index a3caf9a9b8..fd7c2551f4 100644
--- a/src/OmniSharp.Script/ScriptProjectSystem.cs
+++ b/src/OmniSharp.Script/ScriptProjectSystem.cs
@@ -112,7 +112,7 @@ public void Initalize(IConfiguration configuration)
             }
             else
             {
-                HashSet<string> loadedFiles = new HashSet<string>();
+                HashSet<string> loadedFiles = new HashSet<string>(StringComparer.OrdinalIgnoreCase);
 
                 foreach (var compilationAssembly in compilationDependencies.SelectMany(cd => cd.AssemblyPaths).Distinct())
                 {