Fix scripting

src/Interactive/csi/csi.coreclr.rsp

@@ -23,11 +23,11 @@
 /r:System.Threading.Tasks.Parallel
 /r:System.Threading.Thread
 # extra references
+/r:System.Dynamic.Runtime
 /r:System.Linq
 /r:System.Linq.Expressions
 /r:System.Runtime.Numerics
-/r:System.Dynamic.Runtime
-/r:System.ValueTuple.dll
+/r:System.ValueTuple
 /r:Microsoft.CSharp
 # imports
 /u:System

src/Interactive/csi/csi.desktop.rsp

 /r:System
 /r:System.Core
 /r:Microsoft.CSharp
-/r:System.ValueTuple.dll
 /u:System
 /u:System.IO
 /u:System.Collections.Generic

src/Interactive/vbi/vbi.coreclr.rsp

@@ -25,11 +25,11 @@
 /r:System.Threading.Tasks.Parallel
 /r:System.Threading.Thread
 # extra references
+/r:System.Dynamic.Runtime
 /r:System.Linq
 /r:System.Linq.Expressions
 /r:System.Runtime.Numerics
-/r:System.Dynamic.Runtime
-/r:System.ValueTuple.dll
+/r:System.ValueTuple
 # imports
 /u:System
 /u:System.IO

src/Interactive/vbi/vbi.desktop.rsp

 /r:System
 /r:System.Core
-/r:System.ValueTuple.dll
 /Imports:System
 /Imports:System.IO
 /Imports:System.Collections.Generic

src/Scripting/CSharpTest/CommandLineRunnerTests.cs

@@ -43,7 +43,6 @@ private static IEnumerable<string> GetReferences()
                 yield return "System";
                 yield return "System.Core";
                 yield return "Microsoft.CSharp";
-                yield return "System.ValueTuple.dll";
             }
             else
             {
@@ -76,7 +75,6 @@ private static IEnumerable<string> GetReferences()
                 yield return "System.Linq.Expressions";
                 yield return "System.Runtime.Numerics";
                 yield return "System.Dynamic.Runtime";
-                yield return "System.ValueTuple";
                 yield return "Microsoft.CSharp";
             }
         }
@@ -170,7 +168,7 @@ > Math.PI
 >", runner.Console.Out.ToString());
         }
 
-        [Fact(Skip = "https://github.com/dotnet/roslyn/issues/17043")]
+        [Fact]
         [WorkItem(7133, "http://github.com/dotnet/roslyn/issues/7133")]
         public void TestDisplayResultsWithCurrentUICulture2()
         {
@@ -224,7 +222,7 @@ > Print(2)
 > ", runner.Console.Out.ToString());
         }
 
-        [Fact(Skip = "https://github.com/dotnet/roslyn/issues/18479")]
+        [Fact]
         [WorkItem(18479, "https://github.com/dotnet/roslyn/issues/18479")]
         public void Tuples()
         {

src/Scripting/CSharpTest/ScriptTests.cs

@@ -831,7 +831,7 @@ public async Task Pdb_CreateFromString_CodeFromFile_WithEmitDebugInformation_Wit
             }
         }
 
-        [ConditionalFact(typeof(DesktopOnly))]
+        [Fact]
         [WorkItem(19027, "https://github.com/dotnet/roslyn/issues/19027")]
         public Task Pdb_CreateFromString_CodeFromFile_WithEmitDebugInformation_WithFileEncoding_ResultInPdbEmitted()
         {
@@ -853,7 +853,7 @@ public Task Pdb_CreateFromString_CodeFromFile_WithoutEmitDebugInformation_WithFi
             return VerifyStackTraceAsync(() => CSharpScript.Create("throw new System.Exception();", opts));
         }
 
-        [ConditionalFact(typeof(DesktopOnly))]
+        [Fact]
         [WorkItem(19027, "https://github.com/dotnet/roslyn/issues/19027")]
         public Task Pdb_CreateFromStream_CodeFromFile_WithEmitDebugInformation_ResultInPdbEmitted()
         {
@@ -868,7 +868,7 @@ public Task Pdb_CreateFromStream_CodeFromFile_WithoutEmitDebugInformation_Result
             return VerifyStackTraceAsync(() => CSharpScript.Create(new MemoryStream(Encoding.UTF8.GetBytes("throw new System.Exception();")), opts));
         }
 
-        [ConditionalFact(typeof(DesktopOnly))]
+        [Fact]
         [WorkItem(19027, "https://github.com/dotnet/roslyn/issues/19027")]
         public Task Pdb_CreateFromString_InlineCode_WithEmitDebugInformation_WithoutFileEncoding_ResultInPdbEmitted()
         {
@@ -876,7 +876,7 @@ public Task Pdb_CreateFromString_InlineCode_WithEmitDebugInformation_WithoutFile
             return VerifyStackTraceAsync(() => CSharpScript.Create("throw new System.Exception();", opts), line: 1, column: 1, filename: "");
         }
 
-        [ConditionalFact(typeof(DesktopOnly))]
+        [Fact]
         [WorkItem(19027, "https://github.com/dotnet/roslyn/issues/19027")]
         public Task Pdb_CreateFromString_InlineCode_WithEmitDebugInformation_WithFileEncoding_ResultInPdbEmitted()
         {
@@ -898,7 +898,7 @@ public Task Pdb_CreateFromString_InlineCode_WithoutEmitDebugInformation_WithFile
             return VerifyStackTraceAsync(() => CSharpScript.Create("throw new System.Exception();", opts));
         }
 
-        [ConditionalFact(typeof(DesktopOnly))]
+        [Fact]
         [WorkItem(19027, "https://github.com/dotnet/roslyn/issues/19027")]
         public Task Pdb_CreateFromStream_InlineCode_WithEmitDebugInformation_ResultInPdbEmitted()
         {

src/Scripting/Core/ScriptOptions.cs

@@ -63,6 +63,7 @@ private static ImmutableArray<MetadataReference> GetDefaultMetadataReferences()
                 "System.Threading.Tasks",
                 "System.Threading.Tasks.Parallel",
                 "System.Threading.Thread",
+                "System.ValueTuple",
             };
 
             return ImmutableArray.CreateRange(files.Select(CreateUnresolvedReference));

src/Scripting/CoreTest/ScriptOptionsTests.cs

@@ -24,7 +24,7 @@ public void AddReferences()
                 AddReferences("System.Linq").
                 AddReferences("System.Linq");
 
-            Assert.Equal(GacFileResolver.IsAvailable ? 5 : 29, options.MetadataReferences.Length);
+            Assert.Equal(GacFileResolver.IsAvailable ? 5 : 30, options.MetadataReferences.Length);
         }
 
         [Fact]

src/Test/Utilities/Portable/Platform/Desktop/TestHelpers.cs

@@ -67,14 +67,13 @@ public class TestAnalyzer : DiagnosticAnalyzer
             dir.CopyFile(typeof(System.Reflection.Metadata.MetadataReader).Assembly.Location);
             var immutable = dir.CopyFile(typeof(ImmutableArray).Assembly.Location);
             var analyzer = dir.CopyFile(typeof(DiagnosticAnalyzer).Assembly.Location);
-            dir.CopyFile(Path.Combine(Path.GetDirectoryName(typeof(CSharpCompilation).Assembly.Location), "System.IO.FileSystem.dll"));
 
             var analyzerCompilation = CSharpCompilation.Create(
                 assemblyName,
                 new SyntaxTree[] { SyntaxFactory.ParseSyntaxTree(analyzerSource) },
                 new MetadataReference[]
                 {
-                    TestReferences.NetStandard13.SystemRuntime,
+                    TestReferences.NetStandard20.NetStandard,
                     MetadataReference.CreateFromFile(immutable.Path),
                     MetadataReference.CreateFromFile(analyzer.Path)
                 },

src/VisualStudio/CSharp/Repl/CSharpInteractive.rsp

 /r:System
 /r:System.Core
 /r:Microsoft.CSharp
-/r:System.ValueTuple.dll
 /u:System
 /u:System.IO
 /u:System.Collections.Generic