Move System.Runtime and System.Private.Uri to FxCore\Open. Checked in by erme

[tfs-changeset: 1459363]

11 files changed, 793 insertions, 1 deletions

diff --git a/src/System.Runtime/System.Runtime.sln b/src/System.Runtime/System.Runtime.sln
index acf7ef700f..f6a264062a 100644
--- a/src/System.Runtime/System.Runtime.sln
+++ b/src/System.Runtime/System.Runtime.sln
@@ -1,6 +1,6 @@
 Microsoft Visual Studio Solution File, Format Version 12.00
 # Visual Studio 14
-VisualStudioVersion = 14.0.22129.1
+VisualStudioVersion = 14.0.22817.0
 MinimumVisualStudioVersion = 10.0.40219.1
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "System.Runtime.Tests", "tests\System.Runtime.Tests.csproj", "{7F5F5134-00FE-4DE8-B20C-3DA8BA2EBA68}"
 EndProject
@@ -11,16 +11,44 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = ".nuget", ".nuget", "{1CA59C
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "XunitTraitsDiscoverers", "..\Common\tests\XunitTraitsDiscoverers\XunitTraitsDiscoverers.csproj", "{BE8ED8C1-C314-4C4E-A929-64C9C8B3552A}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "System.Runtime.CoreCLR", "src\System.Runtime.CoreCLR.csproj", "{56B9D0A9-44D3-488E-8B42-C14A6E30CAB2}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "System.Private.Uri.CoreCLR", "..\System.Private.Uri\src\System.Private.Uri.CoreCLR.csproj", "{4AC5343E-6E31-4BA5-A795-0493AE7E9008}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
 		Debug|ARM = Debug|ARM
 		Debug|x64 = Debug|x64
 		Debug|x86 = Debug|x86
+		Linux_Debug|Any CPU = Linux_Debug|Any CPU
+		Linux_Debug|ARM = Linux_Debug|ARM
+		Linux_Debug|x64 = Linux_Debug|x64
+		Linux_Debug|x86 = Linux_Debug|x86
+		Linux_Release|Any CPU = Linux_Release|Any CPU
+		Linux_Release|ARM = Linux_Release|ARM
+		Linux_Release|x64 = Linux_Release|x64
+		Linux_Release|x86 = Linux_Release|x86
+		OSX_Debug|Any CPU = OSX_Debug|Any CPU
+		OSX_Debug|ARM = OSX_Debug|ARM
+		OSX_Debug|x64 = OSX_Debug|x64
+		OSX_Debug|x86 = OSX_Debug|x86
+		OSX_Release|Any CPU = OSX_Release|Any CPU
+		OSX_Release|ARM = OSX_Release|ARM
+		OSX_Release|x64 = OSX_Release|x64
+		OSX_Release|x86 = OSX_Release|x86
 		Release|Any CPU = Release|Any CPU
 		Release|ARM = Release|ARM
 		Release|x64 = Release|x64
 		Release|x86 = Release|x86
+		Windows_Debug|Any CPU = Windows_Debug|Any CPU
+		Windows_Debug|ARM = Windows_Debug|ARM
+		Windows_Debug|x64 = Windows_Debug|x64
+		Windows_Debug|x86 = Windows_Debug|x86
+		Windows_Release|Any CPU = Windows_Release|Any CPU
+		Windows_Release|ARM = Windows_Release|ARM
+		Windows_Release|x64 = Windows_Release|x64
+		Windows_Release|x86 = Windows_Release|x86
 	EndGlobalSection
 	GlobalSection(ProjectConfigurationPlatforms) = postSolution
 		{7F5F5134-00FE-4DE8-B20C-3DA8BA2EBA68}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
@@ -28,11 +56,251 @@ Global
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 		{7F5F5134-00FE-4DE8-B20C-3DA8BA2EBA68}.Debug|x64.ActiveCfg = Debug|Any CPU
 		{7F5F5134-00FE-4DE8-B20C-3DA8BA2EBA68}.Debug|x86.ActiveCfg = Debug|Any CPU
+		{7F5F5134-00FE-4DE8-B20C-3DA8BA2EBA68}.Linux_Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{7F5F5134-00FE-4DE8-B20C-3DA8BA2EBA68}.Linux_Debug|Any CPU.Build.0 = Debug|Any CPU
+		{7F5F5134-00FE-4DE8-B20C-3DA8BA2EBA68}.Linux_Debug|ARM.ActiveCfg = Debug|Any CPU
+		{7F5F5134-00FE-4DE8-B20C-3DA8BA2EBA68}.Linux_Debug|ARM.Build.0 = Debug|Any CPU
+		{7F5F5134-00FE-4DE8-B20C-3DA8BA2EBA68}.Linux_Debug|x64.ActiveCfg = Debug|Any CPU
+		{7F5F5134-00FE-4DE8-B20C-3DA8BA2EBA68}.Linux_Debug|x64.Build.0 = Debug|Any CPU
+		{7F5F5134-00FE-4DE8-B20C-3DA8BA2EBA68}.Linux_Debug|x86.ActiveCfg = Debug|Any CPU
+		{7F5F5134-00FE-4DE8-B20C-3DA8BA2EBA68}.Linux_Debug|x86.Build.0 = Debug|Any CPU
+		{7F5F5134-00FE-4DE8-B20C-3DA8BA2EBA68}.Linux_Release|Any CPU.ActiveCfg = Release|Any CPU
+		{7F5F5134-00FE-4DE8-B20C-3DA8BA2EBA68}.Linux_Release|Any CPU.Build.0 = Release|Any CPU
+		{7F5F5134-00FE-4DE8-B20C-3DA8BA2EBA68}.Linux_Release|ARM.ActiveCfg = Release|Any CPU
+		{7F5F5134-00FE-4DE8-B20C-3DA8BA2EBA68}.Linux_Release|ARM.Build.0 = Release|Any CPU
+		{7F5F5134-00FE-4DE8-B20C-3DA8BA2EBA68}.Linux_Release|x64.ActiveCfg = Release|Any CPU
+		{7F5F5134-00FE-4DE8-B20C-3DA8BA2EBA68}.Linux_Release|x64.Build.0 = Release|Any CPU
+		{7F5F5134-00FE-4DE8-B20C-3DA8BA2EBA68}.Linux_Release|x86.ActiveCfg = Release|Any CPU
+		{7F5F5134-00FE-4DE8-B20C-3DA8BA2EBA68}.Linux_Release|x86.Build.0 = Release|Any CPU
+		{7F5F5134-00FE-4DE8-B20C-3DA8BA2EBA68}.OSX_Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{7F5F5134-00FE-4DE8-B20C-3DA8BA2EBA68}.OSX_Debug|Any CPU.Build.0 = Debug|Any CPU
+		{7F5F5134-00FE-4DE8-B20C-3DA8BA2EBA68}.OSX_Debug|ARM.ActiveCfg = Debug|Any CPU
+		{7F5F5134-00FE-4DE8-B20C-3DA8BA2EBA68}.OSX_Debug|ARM.Build.0 = Debug|Any CPU
+		{7F5F5134-00FE-4DE8-B20C-3DA8BA2EBA68}.OSX_Debug|x64.ActiveCfg = Debug|Any CPU
+		{7F5F5134-00FE-4DE8-B20C-3DA8BA2EBA68}.OSX_Debug|x64.Build.0 = Debug|Any CPU
+		{7F5F5134-00FE-4DE8-B20C-3DA8BA2EBA68}.OSX_Debug|x86.ActiveCfg = Debug|Any CPU
+		{7F5F5134-00FE-4DE8-B20C-3DA8BA2EBA68}.OSX_Debug|x86.Build.0 = Debug|Any CPU
+		{7F5F5134-00FE-4DE8-B20C-3DA8BA2EBA68}.OSX_Release|Any CPU.ActiveCfg = Release|Any CPU
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+		{7F5F5134-00FE-4DE8-B20C-3DA8BA2EBA68}.OSX_Release|ARM.ActiveCfg = Release|Any CPU
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+		{7F5F5134-00FE-4DE8-B20C-3DA8BA2EBA68}.OSX_Release|x64.ActiveCfg = Release|Any CPU
+		{7F5F5134-00FE-4DE8-B20C-3DA8BA2EBA68}.OSX_Release|x64.Build.0 = Release|Any CPU
+		{7F5F5134-00FE-4DE8-B20C-3DA8BA2EBA68}.OSX_Release|x86.ActiveCfg = Release|Any CPU
+		{7F5F5134-00FE-4DE8-B20C-3DA8BA2EBA68}.OSX_Release|x86.Build.0 = Release|Any CPU
 		{7F5F5134-00FE-4DE8-B20C-3DA8BA2EBA68}.Release|Any CPU.ActiveCfg = Release|Any CPU
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 		{7F5F5134-00FE-4DE8-B20C-3DA8BA2EBA68}.Release|x86.ActiveCfg = Release|Any CPU
+		{7F5F5134-00FE-4DE8-B20C-3DA8BA2EBA68}.Windows_Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{7F5F5134-00FE-4DE8-B20C-3DA8BA2EBA68}.Windows_Debug|Any CPU.Build.0 = Debug|Any CPU
+		{7F5F5134-00FE-4DE8-B20C-3DA8BA2EBA68}.Windows_Debug|ARM.ActiveCfg = Debug|Any CPU
+		{7F5F5134-00FE-4DE8-B20C-3DA8BA2EBA68}.Windows_Debug|ARM.Build.0 = Debug|Any CPU
+		{7F5F5134-00FE-4DE8-B20C-3DA8BA2EBA68}.Windows_Debug|x64.ActiveCfg = Debug|Any CPU
+		{7F5F5134-00FE-4DE8-B20C-3DA8BA2EBA68}.Windows_Debug|x64.Build.0 = Debug|Any CPU
+		{7F5F5134-00FE-4DE8-B20C-3DA8BA2EBA68}.Windows_Debug|x86.ActiveCfg = Debug|Any CPU
+		{7F5F5134-00FE-4DE8-B20C-3DA8BA2EBA68}.Windows_Debug|x86.Build.0 = Debug|Any CPU
+		{7F5F5134-00FE-4DE8-B20C-3DA8BA2EBA68}.Windows_Release|Any CPU.ActiveCfg = Release|Any CPU
+		{7F5F5134-00FE-4DE8-B20C-3DA8BA2EBA68}.Windows_Release|Any CPU.Build.0 = Release|Any CPU
+		{7F5F5134-00FE-4DE8-B20C-3DA8BA2EBA68}.Windows_Release|ARM.ActiveCfg = Release|Any CPU
+		{7F5F5134-00FE-4DE8-B20C-3DA8BA2EBA68}.Windows_Release|ARM.Build.0 = Release|Any CPU
+		{7F5F5134-00FE-4DE8-B20C-3DA8BA2EBA68}.Windows_Release|x64.ActiveCfg = Release|Any CPU
+		{7F5F5134-00FE-4DE8-B20C-3DA8BA2EBA68}.Windows_Release|x64.Build.0 = Release|Any CPU
+		{7F5F5134-00FE-4DE8-B20C-3DA8BA2EBA68}.Windows_Release|x86.ActiveCfg = Release|Any CPU
+		{7F5F5134-00FE-4DE8-B20C-3DA8BA2EBA68}.Windows_Release|x86.Build.0 = Release|Any CPU
+		{BE8ED8C1-C314-4C4E-A929-64C9C8B3552A}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{BE8ED8C1-C314-4C4E-A929-64C9C8B3552A}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{BE8ED8C1-C314-4C4E-A929-64C9C8B3552A}.Debug|ARM.ActiveCfg = Debug|Any CPU
+		{BE8ED8C1-C314-4C4E-A929-64C9C8B3552A}.Debug|ARM.Build.0 = Debug|Any CPU
+		{BE8ED8C1-C314-4C4E-A929-64C9C8B3552A}.Debug|x64.ActiveCfg = Debug|Any CPU
+		{BE8ED8C1-C314-4C4E-A929-64C9C8B3552A}.Debug|x64.Build.0 = Debug|Any CPU
+		{BE8ED8C1-C314-4C4E-A929-64C9C8B3552A}.Debug|x86.ActiveCfg = Debug|Any CPU
+		{BE8ED8C1-C314-4C4E-A929-64C9C8B3552A}.Debug|x86.Build.0 = Debug|Any CPU
+		{BE8ED8C1-C314-4C4E-A929-64C9C8B3552A}.Linux_Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{BE8ED8C1-C314-4C4E-A929-64C9C8B3552A}.Linux_Debug|Any CPU.Build.0 = Debug|Any CPU
+		{BE8ED8C1-C314-4C4E-A929-64C9C8B3552A}.Linux_Debug|ARM.ActiveCfg = Debug|Any CPU
+		{BE8ED8C1-C314-4C4E-A929-64C9C8B3552A}.Linux_Debug|ARM.Build.0 = Debug|Any CPU
+		{BE8ED8C1-C314-4C4E-A929-64C9C8B3552A}.Linux_Debug|x64.ActiveCfg = Debug|Any CPU
+		{BE8ED8C1-C314-4C4E-A929-64C9C8B3552A}.Linux_Debug|x64.Build.0 = Debug|Any CPU
+		{BE8ED8C1-C314-4C4E-A929-64C9C8B3552A}.Linux_Debug|x86.ActiveCfg = Debug|Any CPU
+		{BE8ED8C1-C314-4C4E-A929-64C9C8B3552A}.Linux_Debug|x86.Build.0 = Debug|Any CPU
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+		{BE8ED8C1-C314-4C4E-A929-64C9C8B3552A}.Linux_Release|x86.Build.0 = Release|Any CPU
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+		{BE8ED8C1-C314-4C4E-A929-64C9C8B3552A}.OSX_Debug|ARM.Build.0 = Debug|Any CPU
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+		{BE8ED8C1-C314-4C4E-A929-64C9C8B3552A}.OSX_Debug|x86.Build.0 = Debug|Any CPU
+		{BE8ED8C1-C314-4C4E-A929-64C9C8B3552A}.OSX_Release|Any CPU.ActiveCfg = Release|Any CPU
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+		{BE8ED8C1-C314-4C4E-A929-64C9C8B3552A}.OSX_Release|x64.Build.0 = Release|Any CPU
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+		{BE8ED8C1-C314-4C4E-A929-64C9C8B3552A}.OSX_Release|x86.Build.0 = Release|Any CPU
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+		{BE8ED8C1-C314-4C4E-A929-64C9C8B3552A}.Release|Any CPU.Build.0 = Release|Any CPU
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+		{BE8ED8C1-C314-4C4E-A929-64C9C8B3552A}.Windows_Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{BE8ED8C1-C314-4C4E-A929-64C9C8B3552A}.Windows_Debug|Any CPU.Build.0 = Debug|Any CPU
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+		{BE8ED8C1-C314-4C4E-A929-64C9C8B3552A}.Windows_Debug|x64.Build.0 = Debug|Any CPU
+		{BE8ED8C1-C314-4C4E-A929-64C9C8B3552A}.Windows_Debug|x86.ActiveCfg = Debug|Any CPU
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+		{BE8ED8C1-C314-4C4E-A929-64C9C8B3552A}.Windows_Release|Any CPU.ActiveCfg = Release|Any CPU
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+		{BE8ED8C1-C314-4C4E-A929-64C9C8B3552A}.Windows_Release|x86.ActiveCfg = Release|Any CPU
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+		{56B9D0A9-44D3-488E-8B42-C14A6E30CAB2}.Debug|Any CPU.ActiveCfg = Windows_Debug|Any CPU
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+		{56B9D0A9-44D3-488E-8B42-C14A6E30CAB2}.Linux_Debug|ARM.ActiveCfg = Linux_Debug|Any CPU
+		{56B9D0A9-44D3-488E-8B42-C14A6E30CAB2}.Linux_Debug|ARM.Build.0 = Linux_Debug|Any CPU
+		{56B9D0A9-44D3-488E-8B42-C14A6E30CAB2}.Linux_Debug|x64.ActiveCfg = Linux_Debug|Any CPU
+		{56B9D0A9-44D3-488E-8B42-C14A6E30CAB2}.Linux_Debug|x64.Build.0 = Linux_Debug|Any CPU
+		{56B9D0A9-44D3-488E-8B42-C14A6E30CAB2}.Linux_Debug|x86.ActiveCfg = Linux_Debug|Any CPU
+		{56B9D0A9-44D3-488E-8B42-C14A6E30CAB2}.Linux_Debug|x86.Build.0 = Linux_Debug|Any CPU
+		{56B9D0A9-44D3-488E-8B42-C14A6E30CAB2}.Linux_Release|Any CPU.ActiveCfg = Linux_Release|Any CPU
+		{56B9D0A9-44D3-488E-8B42-C14A6E30CAB2}.Linux_Release|Any CPU.Build.0 = Linux_Release|Any CPU
+		{56B9D0A9-44D3-488E-8B42-C14A6E30CAB2}.Linux_Release|ARM.ActiveCfg = Linux_Release|Any CPU
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+		{56B9D0A9-44D3-488E-8B42-C14A6E30CAB2}.OSX_Debug|x86.Build.0 = OSX_Debug|Any CPU
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+		{56B9D0A9-44D3-488E-8B42-C14A6E30CAB2}.OSX_Release|ARM.Build.0 = OSX_Release|Any CPU
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+		{56B9D0A9-44D3-488E-8B42-C14A6E30CAB2}.OSX_Release|x64.Build.0 = OSX_Release|Any CPU
+		{56B9D0A9-44D3-488E-8B42-C14A6E30CAB2}.OSX_Release|x86.ActiveCfg = OSX_Release|Any CPU
+		{56B9D0A9-44D3-488E-8B42-C14A6E30CAB2}.OSX_Release|x86.Build.0 = OSX_Release|Any CPU
+		{56B9D0A9-44D3-488E-8B42-C14A6E30CAB2}.Release|Any CPU.ActiveCfg = Windows_Release|Any CPU
+		{56B9D0A9-44D3-488E-8B42-C14A6E30CAB2}.Release|Any CPU.Build.0 = Windows_Release|Any CPU
+		{56B9D0A9-44D3-488E-8B42-C14A6E30CAB2}.Release|ARM.ActiveCfg = Windows_Release|Any CPU
+		{56B9D0A9-44D3-488E-8B42-C14A6E30CAB2}.Release|ARM.Build.0 = Windows_Release|Any CPU
+		{56B9D0A9-44D3-488E-8B42-C14A6E30CAB2}.Release|x64.ActiveCfg = Windows_Release|Any CPU
+		{56B9D0A9-44D3-488E-8B42-C14A6E30CAB2}.Release|x64.Build.0 = Windows_Release|Any CPU
+		{56B9D0A9-44D3-488E-8B42-C14A6E30CAB2}.Release|x86.ActiveCfg = Windows_Release|Any CPU
+		{56B9D0A9-44D3-488E-8B42-C14A6E30CAB2}.Release|x86.Build.0 = Windows_Release|Any CPU
+		{56B9D0A9-44D3-488E-8B42-C14A6E30CAB2}.Windows_Debug|Any CPU.ActiveCfg = Windows_Debug|Any CPU
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+		{56B9D0A9-44D3-488E-8B42-C14A6E30CAB2}.Windows_Release|x86.Build.0 = Windows_Release|Any CPU
+		{4AC5343E-6E31-4BA5-A795-0493AE7E9008}.Debug|Any CPU.ActiveCfg = Windows_Debug|Any CPU
+		{4AC5343E-6E31-4BA5-A795-0493AE7E9008}.Debug|Any CPU.Build.0 = Windows_Debug|Any CPU
+		{4AC5343E-6E31-4BA5-A795-0493AE7E9008}.Debug|ARM.ActiveCfg = Windows_Debug|Any CPU
+		{4AC5343E-6E31-4BA5-A795-0493AE7E9008}.Debug|ARM.Build.0 = Windows_Debug|Any CPU
+		{4AC5343E-6E31-4BA5-A795-0493AE7E9008}.Debug|x64.ActiveCfg = Windows_Debug|Any CPU
+		{4AC5343E-6E31-4BA5-A795-0493AE7E9008}.Debug|x64.Build.0 = Windows_Debug|Any CPU
+		{4AC5343E-6E31-4BA5-A795-0493AE7E9008}.Debug|x86.ActiveCfg = Windows_Debug|Any CPU
+		{4AC5343E-6E31-4BA5-A795-0493AE7E9008}.Debug|x86.Build.0 = Windows_Debug|Any CPU
+		{4AC5343E-6E31-4BA5-A795-0493AE7E9008}.Linux_Debug|Any CPU.ActiveCfg = Linux_Debug|Any CPU
+		{4AC5343E-6E31-4BA5-A795-0493AE7E9008}.Linux_Debug|Any CPU.Build.0 = Linux_Debug|Any CPU
+		{4AC5343E-6E31-4BA5-A795-0493AE7E9008}.Linux_Debug|ARM.ActiveCfg = Linux_Debug|Any CPU
+		{4AC5343E-6E31-4BA5-A795-0493AE7E9008}.Linux_Debug|ARM.Build.0 = Linux_Debug|Any CPU
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+		{4AC5343E-6E31-4BA5-A795-0493AE7E9008}.Linux_Debug|x64.Build.0 = Linux_Debug|Any CPU
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+		{4AC5343E-6E31-4BA5-A795-0493AE7E9008}.Linux_Release|x86.Build.0 = Linux_Release|Any CPU
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+		{4AC5343E-6E31-4BA5-A795-0493AE7E9008}.Release|x86.Build.0 = Windows_Release|Any CPU
+		{4AC5343E-6E31-4BA5-A795-0493AE7E9008}.Windows_Debug|Any CPU.ActiveCfg = Windows_Debug|Any CPU
+		{4AC5343E-6E31-4BA5-A795-0493AE7E9008}.Windows_Debug|Any CPU.Build.0 = Windows_Debug|Any CPU
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+		{4AC5343E-6E31-4BA5-A795-0493AE7E9008}.Windows_Debug|x86.Build.0 = Windows_Debug|Any CPU
+		{4AC5343E-6E31-4BA5-A795-0493AE7E9008}.Windows_Release|Any CPU.ActiveCfg = Windows_Release|Any CPU
+		{4AC5343E-6E31-4BA5-A795-0493AE7E9008}.Windows_Release|Any CPU.Build.0 = Windows_Release|Any CPU
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+		{4AC5343E-6E31-4BA5-A795-0493AE7E9008}.Windows_Release|ARM.Build.0 = Windows_Release|Any CPU
+		{4AC5343E-6E31-4BA5-A795-0493AE7E9008}.Windows_Release|x64.ActiveCfg = Windows_Release|Any CPU
+		{4AC5343E-6E31-4BA5-A795-0493AE7E9008}.Windows_Release|x64.Build.0 = Windows_Release|Any CPU
+		{4AC5343E-6E31-4BA5-A795-0493AE7E9008}.Windows_Release|x86.ActiveCfg = Windows_Release|Any CPU
+		{4AC5343E-6E31-4BA5-A795-0493AE7E9008}.Windows_Release|x86.Build.0 = Windows_Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
diff --git a/src/System.Runtime/src/System.Runtime.CoreCLR.csproj b/src/System.Runtime/src/System.Runtime.CoreCLR.csproj
new file mode 100644
index 0000000000..21b7734d5d
--- /dev/null
+++ b/src/System.Runtime/src/System.Runtime.CoreCLR.csproj
@@ -0,0 +1,40 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="12.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), dir.props))\dir.props" />
+
+  <PropertyGroup>
+    <AssemblyName>System.Runtime</AssemblyName>
+    <AssemblyVersion>4.0.20.0</AssemblyVersion>
+    <OutputType>Library</OutputType>
+    <IsPartialFacadeAssembly>true</IsPartialFacadeAssembly>
+    <NuGetTargetFrameworkMoniker>ASP.NetCore, version=v5.0</NuGetTargetFrameworkMoniker>
+  </PropertyGroup>
+
+  <!-- Default configurations to help VS understand the configurations -->
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Linux_Debug|AnyCPU' " />
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Linux_Release|AnyCPU' " />
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'OSX_Debug|AnyCPU' " />
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'OSX_Release|AnyCPU' " />
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Windows_Debug|AnyCPU' " />
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Windows_Release|AnyCPU' " />
+
+  <ItemGroup>
+    <Compile Include="System\Action.cs" />
+    <Compile Include="System\Function.cs" />
+    <Compile Include="System\LazyOfTTMetadata.cs" />
+    <Compile Include="System\Collections\Generic\ISet.cs" />
+    <Compile Include="System\ComponentModel\DefaultValueAttribute.cs" />
+    <Compile Include="System\ComponentModel\EditorBrowsableAttribute.cs" />
+    <Compile Include="System\Runtime\CompilerServices\StrongBox.cs" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\..\System.Private.Uri\src\System.Private.Uri.CoreCLR.csproj" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <None Include="project.json" />
+  </ItemGroup>
+
+  <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), dir.targets))\dir.targets" />
+</Project>
\ No newline at end of file
diff --git a/src/System.Runtime/src/System/Action.cs b/src/System.Runtime/src/System/Action.cs
new file mode 100644
index 0000000000..af286bc60a
--- /dev/null
+++ b/src/System.Runtime/src/System/Action.cs
@@ -0,0 +1,29 @@
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+namespace System
+{
+    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1005:AvoidExcessiveParametersOnGenericTypes")]
+    public delegate void Action<in T1, in T2, in T3, in T4, in T5, in T6, in T7, in T8, in T9>(T1 arg1, T2 arg2, T3 arg3, T4 arg4, T5 arg5, T6 arg6, T7 arg7, T8 arg8, T9 arg9);
+
+    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1005:AvoidExcessiveParametersOnGenericTypes")]
+    public delegate void Action<in T1, in T2, in T3, in T4, in T5, in T6, in T7, in T8, in T9, in T10>(T1 arg1, T2 arg2, T3 arg3, T4 arg4, T5 arg5, T6 arg6, T7 arg7, T8 arg8, T9 arg9, T10 arg10);
+
+    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1005:AvoidExcessiveParametersOnGenericTypes")]
+    public delegate void Action<in T1, in T2, in T3, in T4, in T5, in T6, in T7, in T8, in T9, in T10, in T11>(T1 arg1, T2 arg2, T3 arg3, T4 arg4, T5 arg5, T6 arg6, T7 arg7, T8 arg8, T9 arg9, T10 arg10, T11 arg11);
+
+    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1005:AvoidExcessiveParametersOnGenericTypes")]
+    public delegate void Action<in T1, in T2, in T3, in T4, in T5, in T6, in T7, in T8, in T9, in T10, in T11, in T12>(T1 arg1, T2 arg2, T3 arg3, T4 arg4, T5 arg5, T6 arg6, T7 arg7, T8 arg8, T9 arg9, T10 arg10, T11 arg11, T12 arg12);
+
+    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1005:AvoidExcessiveParametersOnGenericTypes")]
+    public delegate void Action<in T1, in T2, in T3, in T4, in T5, in T6, in T7, in T8, in T9, in T10, in T11, in T12, in T13>(T1 arg1, T2 arg2, T3 arg3, T4 arg4, T5 arg5, T6 arg6, T7 arg7, T8 arg8, T9 arg9, T10 arg10, T11 arg11, T12 arg12, T13 arg13);
+
+    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1005:AvoidExcessiveParametersOnGenericTypes")]
+    public delegate void Action<in T1, in T2, in T3, in T4, in T5, in T6, in T7, in T8, in T9, in T10, in T11, in T12, in T13, in T14>(T1 arg1, T2 arg2, T3 arg3, T4 arg4, T5 arg5, T6 arg6, T7 arg7, T8 arg8, T9 arg9, T10 arg10, T11 arg11, T12 arg12, T13 arg13, T14 arg14);
+
+    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1005:AvoidExcessiveParametersOnGenericTypes")]
+    public delegate void Action<in T1, in T2, in T3, in T4, in T5, in T6, in T7, in T8, in T9, in T10, in T11, in T12, in T13, in T14, in T15>(T1 arg1, T2 arg2, T3 arg3, T4 arg4, T5 arg5, T6 arg6, T7 arg7, T8 arg8, T9 arg9, T10 arg10, T11 arg11, T12 arg12, T13 arg13, T14 arg14, T15 arg15);
+
+    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1005:AvoidExcessiveParametersOnGenericTypes")]
+    public delegate void Action<in T1, in T2, in T3, in T4, in T5, in T6, in T7, in T8, in T9, in T10, in T11, in T12, in T13, in T14, in T15, in T16>(T1 arg1, T2 arg2, T3 arg3, T4 arg4, T5 arg5, T6 arg6, T7 arg7, T8 arg8, T9 arg9, T10 arg10, T11 arg11, T12 arg12, T13 arg13, T14 arg14, T15 arg15, T16 arg16);
+}
diff --git a/src/System.Runtime/src/System/Collections/Generic/ISet.cs b/src/System.Runtime/src/System/Collections/Generic/ISet.cs
new file mode 100644
index 0000000000..2b57e5d483
--- /dev/null
+++ b/src/System.Runtime/src/System/Collections/Generic/ISet.cs
@@ -0,0 +1,48 @@
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+using System.Runtime.CompilerServices;
+
+namespace System.Collections.Generic
+{
+    /// <summary>
+    /// Generic collection that guarantees the uniqueness of its elements, as defined
+    /// by some comparer. It also supports basic set operations such as Union, Intersection, 
+    /// Complement and Exclusive Complement.
+    /// </summary>
+    public interface ISet<T> : ICollection<T>
+    {
+        //Add ITEM to the set, return true if added, false if duplicate
+        new bool Add(T item);
+
+        //Transform this set into its union with the IEnumerable<T> other
+        void UnionWith(IEnumerable<T> other);
+
+        //Transform this set into its intersection with the IEnumberable<T> other
+        void IntersectWith(IEnumerable<T> other);
+
+        //Transform this set so it contains no elements that are also in other
+        void ExceptWith(IEnumerable<T> other);
+
+        //Transform this set so it contains elements initially in this or in other, but not both
+        void SymmetricExceptWith(IEnumerable<T> other);
+
+        //Check if this set is a subset of other
+        bool IsSubsetOf(IEnumerable<T> other);
+
+        //Check if this set is a superset of other
+        bool IsSupersetOf(IEnumerable<T> other);
+
+        //Check if this set is a subset of other, but not the same as it
+        bool IsProperSupersetOf(IEnumerable<T> other);
+
+        //Check if this set is a superset of other, but not the same as it
+        bool IsProperSubsetOf(IEnumerable<T> other);
+
+        //Check if this set has any elements in common with other
+        bool Overlaps(IEnumerable<T> other);
+
+        //Check if this set contains the same and only the same elements as other
+        bool SetEquals(IEnumerable<T> other);
+    }
+}
diff --git a/src/System.Runtime/src/System/ComponentModel/DefaultValueAttribute.cs b/src/System.Runtime/src/System/ComponentModel/DefaultValueAttribute.cs
new file mode 100644
index 0000000000..d9e1454fba
--- /dev/null
+++ b/src/System.Runtime/src/System/ComponentModel/DefaultValueAttribute.cs
@@ -0,0 +1,183 @@
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+using System;
+using System.ComponentModel;
+using System.Diagnostics;
+using System.Globalization;
+using System.Runtime.InteropServices;
+
+namespace System.ComponentModel
+{
+    /// <devdoc>
+    ///    <para>Specifies the default value for a property.</para>
+    /// </devdoc>
+    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1019:DefineAccessorsForAttributeArguments")]
+    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Performance", "CA1813:AvoidUnsealedAttributes")]
+    [AttributeUsage(AttributeTargets.All)]
+    public class DefaultValueAttribute : Attribute
+    {
+        /// <devdoc>
+        ///     This is the default value.
+        /// </devdoc>
+        private object value;
+
+        /// <devdoc>
+        /// <para>Initializes a new instance of the <see cref='System.ComponentModel.DefaultValueAttribute'/> class, converting the
+        ///    specified value to the
+        ///    specified type, and using the U.S. English culture as the
+        ///    translation
+        ///    context.</para>
+        /// </devdoc>
+        public DefaultValueAttribute(Type type, string value)
+        {
+            // The try/catch here is because attributes should never throw exceptions.  We would fail to
+            // load an otherwise normal class.
+            try
+            {
+                if (type.IsSubclassOf(typeof(Enum)))
+                {
+                    this.value = Enum.Parse(type, value, true);
+                }
+                else if (type == typeof(TimeSpan))
+                {
+                    this.value = TimeSpan.Parse(value);
+                }
+                else
+                {
+                    this.value = Convert.ChangeType(value, type, CultureInfo.InvariantCulture);
+                }
+            }
+            catch
+            {
+                //Debug.WriteLine("Default value attribute of type " + type.ToString() + " threw converting from the string '" + value + "'.");
+            }
+        }
+
+        /// <devdoc>
+        /// <para>Initializes a new instance of the <see cref='System.ComponentModel.DefaultValueAttribute'/> class using a Unicode
+        ///    character.</para>
+        /// </devdoc>
+        public DefaultValueAttribute(char value)
+        {
+            this.value = value;
+        }
+        /// <devdoc>
+        /// <para>Initializes a new instance of the <see cref='System.ComponentModel.DefaultValueAttribute'/> class using an 8-bit unsigned
+        ///    integer.</para>
+        /// </devdoc>
+        public DefaultValueAttribute(byte value)
+        {
+            this.value = value;
+        }
+        /// <devdoc>
+        /// <para>Initializes a new instance of the <see cref='System.ComponentModel.DefaultValueAttribute'/> class using a 16-bit signed
+        ///    integer.</para>
+        /// </devdoc>
+        public DefaultValueAttribute(short value)
+        {
+            this.value = value;
+        }
+        /// <devdoc>
+        /// <para>Initializes a new instance of the <see cref='System.ComponentModel.DefaultValueAttribute'/> class using a 32-bit signed
+        ///    integer.</para>
+        /// </devdoc>
+        public DefaultValueAttribute(int value)
+        {
+            this.value = value;
+        }
+        /// <devdoc>
+        /// <para>Initializes a new instance of the <see cref='System.ComponentModel.DefaultValueAttribute'/> class using a 64-bit signed
+        ///    integer.</para>
+        /// </devdoc>
+        public DefaultValueAttribute(long value)
+        {
+            this.value = value;
+        }
+        /// <devdoc>
+        /// <para>Initializes a new instance of the <see cref='System.ComponentModel.DefaultValueAttribute'/> class using a
+        ///    single-precision floating point
+        ///    number.</para>
+        /// </devdoc>
+        public DefaultValueAttribute(float value)
+        {
+            this.value = value;
+        }
+        /// <devdoc>
+        /// <para>Initializes a new instance of the <see cref='System.ComponentModel.DefaultValueAttribute'/> class using a
+        ///    double-precision floating point
+        ///    number.</para>
+        /// </devdoc>
+        public DefaultValueAttribute(double value)
+        {
+            this.value = value;
+        }
+        /// <devdoc>
+        /// <para>Initializes a new instance of the <see cref='System.ComponentModel.DefaultValueAttribute'/> class using a <see cref='System.Boolean'/>
+        /// value.</para>
+        /// </devdoc>
+        public DefaultValueAttribute(bool value)
+        {
+            this.value = value;
+        }
+        /// <devdoc>
+        /// <para>Initializes a new instance of the <see cref='System.ComponentModel.DefaultValueAttribute'/> class using a <see cref='System.String'/>.</para>
+        /// </devdoc>
+        public DefaultValueAttribute(string value)
+        {
+            this.value = value;
+        }
+
+        /// <devdoc>
+        /// <para>Initializes a new instance of the <see cref='System.ComponentModel.DefaultValueAttribute'/>
+        /// class.</para>
+        /// </devdoc>
+        public DefaultValueAttribute(object value)
+        {
+            this.value = value;
+        }
+
+        /// <devdoc>
+        ///    <para>
+        ///       Gets the default value of the property this
+        ///       attribute is
+        ///       bound to.
+        ///    </para>
+        /// </devdoc>
+        public virtual object Value
+        {
+            get
+            {
+                return value;
+            }
+        }
+
+        public override bool Equals(object obj)
+        {
+            if (obj == this)
+            {
+                return true;
+            }
+
+            DefaultValueAttribute other = obj as DefaultValueAttribute;
+
+            if (other != null)
+            {
+                if (Value != null)
+                {
+                    return Value.Equals(other.Value);
+                }
+                else
+                {
+                    return (other.Value == null);
+                }
+            }
+            return false;
+        }
+
+        public override int GetHashCode()
+        {
+            return base.GetHashCode();
+        }
+    }
+}
diff --git a/src/System.Runtime/src/System/ComponentModel/EditorBrowsableAttribute.cs b/src/System.Runtime/src/System/ComponentModel/EditorBrowsableAttribute.cs
new file mode 100644
index 0000000000..c8efb09a96
--- /dev/null
+++ b/src/System.Runtime/src/System/ComponentModel/EditorBrowsableAttribute.cs
@@ -0,0 +1,67 @@
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+namespace System.ComponentModel
+{
+    /// <devdoc>
+    ///    <para>[To be supplied.]</para>
+    /// </devdoc>
+    [AttributeUsage(AttributeTargets.Class | AttributeTargets.Struct | AttributeTargets.Enum | AttributeTargets.Constructor | AttributeTargets.Method | AttributeTargets.Property | AttributeTargets.Field | AttributeTargets.Event | AttributeTargets.Delegate | AttributeTargets.Interface)]
+    public sealed class EditorBrowsableAttribute : Attribute
+    {
+        private EditorBrowsableState browsableState;
+
+
+        /// <devdoc>
+        ///    <para>[To be supplied.]</para>
+        /// </devdoc>
+        public EditorBrowsableAttribute(EditorBrowsableState state)
+        {
+            browsableState = state;
+        }
+
+        /// <devdoc>
+        ///    <para>[To be supplied.]</para>
+        /// </devdoc>
+        public EditorBrowsableState State
+        {
+            get { return browsableState; }
+        }
+
+        public override bool Equals(object obj)
+        {
+            if (obj == this)
+            {
+                return true;
+            }
+
+            EditorBrowsableAttribute other = obj as EditorBrowsableAttribute;
+
+            return (other != null) && other.browsableState == browsableState;
+        }
+
+        public override int GetHashCode()
+        {
+            return base.GetHashCode();
+        }
+    }
+
+    /// <devdoc>
+    ///    <para>[To be supplied.]</para>
+    /// </devdoc>
+    public enum EditorBrowsableState
+    {
+        /// <devdoc>
+        ///    <para>[To be supplied.]</para>
+        /// </devdoc>
+        Always,
+        /// <devdoc>
+        ///    <para>[To be supplied.]</para>
+        /// </devdoc>
+        Never,
+        /// <devdoc>
+        ///    <para>[To be supplied.]</para>
+        /// </devdoc>
+        Advanced
+    }
+}
diff --git a/src/System.Runtime/src/System/Function.cs b/src/System.Runtime/src/System/Function.cs
new file mode 100644
index 0000000000..3ea8418fd7
--- /dev/null
+++ b/src/System.Runtime/src/System/Function.cs
@@ -0,0 +1,29 @@
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+namespace System
+{
+    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1005:AvoidExcessiveParametersOnGenericTypes")]
+    public delegate TResult Func<in T1, in T2, in T3, in T4, in T5, in T6, in T7, in T8, in T9, out TResult>(T1 arg1, T2 arg2, T3 arg3, T4 arg4, T5 arg5, T6 arg6, T7 arg7, T8 arg8, T9 arg9);
+
+    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1005:AvoidExcessiveParametersOnGenericTypes")]
+    public delegate TResult Func<in T1, in T2, in T3, in T4, in T5, in T6, in T7, in T8, in T9, in T10, out TResult>(T1 arg1, T2 arg2, T3 arg3, T4 arg4, T5 arg5, T6 arg6, T7 arg7, T8 arg8, T9 arg9, T10 arg10);
+
+    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1005:AvoidExcessiveParametersOnGenericTypes")]
+    public delegate TResult Func<in T1, in T2, in T3, in T4, in T5, in T6, in T7, in T8, in T9, in T10, in T11, out TResult>(T1 arg1, T2 arg2, T3 arg3, T4 arg4, T5 arg5, T6 arg6, T7 arg7, T8 arg8, T9 arg9, T10 arg10, T11 arg11);
+
+    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1005:AvoidExcessiveParametersOnGenericTypes")]
+    public delegate TResult Func<in T1, in T2, in T3, in T4, in T5, in T6, in T7, in T8, in T9, in T10, in T11, in T12, out TResult>(T1 arg1, T2 arg2, T3 arg3, T4 arg4, T5 arg5, T6 arg6, T7 arg7, T8 arg8, T9 arg9, T10 arg10, T11 arg11, T12 arg12);
+
+    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1005:AvoidExcessiveParametersOnGenericTypes")]
+    public delegate TResult Func<in T1, in T2, in T3, in T4, in T5, in T6, in T7, in T8, in T9, in T10, in T11, in T12, in T13, out TResult>(T1 arg1, T2 arg2, T3 arg3, T4 arg4, T5 arg5, T6 arg6, T7 arg7, T8 arg8, T9 arg9, T10 arg10, T11 arg11, T12 arg12, T13 arg13);
+
+    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1005:AvoidExcessiveParametersOnGenericTypes")]
+    public delegate TResult Func<in T1, in T2, in T3, in T4, in T5, in T6, in T7, in T8, in T9, in T10, in T11, in T12, in T13, in T14, out TResult>(T1 arg1, T2 arg2, T3 arg3, T4 arg4, T5 arg5, T6 arg6, T7 arg7, T8 arg8, T9 arg9, T10 arg10, T11 arg11, T12 arg12, T13 arg13, T14 arg14);
+
+    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1005:AvoidExcessiveParametersOnGenericTypes")]
+    public delegate TResult Func<in T1, in T2, in T3, in T4, in T5, in T6, in T7, in T8, in T9, in T10, in T11, in T12, in T13, in T14, in T15, out TResult>(T1 arg1, T2 arg2, T3 arg3, T4 arg4, T5 arg5, T6 arg6, T7 arg7, T8 arg8, T9 arg9, T10 arg10, T11 arg11, T12 arg12, T13 arg13, T14 arg14, T15 arg15);
+
+    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1005:AvoidExcessiveParametersOnGenericTypes")]
+    public delegate TResult Func<in T1, in T2, in T3, in T4, in T5, in T6, in T7, in T8, in T9, in T10, in T11, in T12, in T13, in T14, in T15, in T16, out TResult>(T1 arg1, T2 arg2, T3 arg3, T4 arg4, T5 arg5, T6 arg6, T7 arg7, T8 arg8, T9 arg9, T10 arg10, T11 arg11, T12 arg12, T13 arg13, T14 arg14, T15 arg15, T16 arg16);
+}
diff --git a/src/System.Runtime/src/System/LazyOfTTMetadata.cs b/src/System.Runtime/src/System/LazyOfTTMetadata.cs
new file mode 100644
index 0000000000..d283d60467
--- /dev/null
+++ b/src/System.Runtime/src/System/LazyOfTTMetadata.cs
@@ -0,0 +1,59 @@
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+using System.Collections.Generic;
+using System.Text;
+using System.Threading;
+
+namespace System
+{
+    public class Lazy<T, TMetadata> : Lazy<T>
+    {
+        private readonly TMetadata _metadata;
+
+        public Lazy(Func<T> valueFactory, TMetadata metadata) :
+            base(valueFactory)
+        {
+            _metadata = metadata;
+        }
+
+        public Lazy(TMetadata metadata) :
+            base()
+        {
+            _metadata = metadata;
+        }
+
+
+        public Lazy(TMetadata metadata, bool isThreadSafe) :
+            base(isThreadSafe)
+        {
+            _metadata = metadata;
+        }
+
+        public Lazy(Func<T> valueFactory, TMetadata metadata, bool isThreadSafe) :
+            base(valueFactory, isThreadSafe)
+        {
+            _metadata = metadata;
+        }
+
+        public Lazy(TMetadata metadata, LazyThreadSafetyMode mode) :
+            base(mode)
+        {
+            _metadata = metadata;
+        }
+
+        public Lazy(Func<T> valueFactory, TMetadata metadata, LazyThreadSafetyMode mode) :
+            base(valueFactory, mode)
+        {
+            _metadata = metadata;
+        }
+
+        public TMetadata Metadata
+        {
+            get
+            {
+                return _metadata;
+            }
+        }
+    }
+}
diff --git a/src/System.Runtime/src/System/Runtime/CompilerServices/StrongBox.cs b/src/System.Runtime/src/System/Runtime/CompilerServices/StrongBox.cs
new file mode 100644
index 0000000000..e04c697c14
--- /dev/null
+++ b/src/System.Runtime/src/System/Runtime/CompilerServices/StrongBox.cs
@@ -0,0 +1,58 @@
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+namespace System.Runtime.CompilerServices
+{
+    /// <summary>
+    /// Holds a reference to a value.
+    /// </summary>
+    /// <typeparam name="T">The type of the value that the <see cref = "StrongBox{T}"></see> references.</typeparam>
+    public class StrongBox<T> : IStrongBox
+    {
+        /// <summary>
+        /// Gets the strongly typed value associated with the <see cref = "StrongBox{T}"></see>
+        /// <remarks>This is explicitly exposed as a field instead of a property to enable loading the address of the field.</remarks>
+        /// </summary>
+        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1051:DoNotDeclareVisibleInstanceFields")]
+        public T Value;
+
+        /// <summary>
+        /// Initializes a new StrongBox which can receive a value when used in a reference call.
+        /// </summary>
+        public StrongBox()
+        {
+        }
+
+        /// <summary>
+        /// Initializes a new <see cref = "StrongBox{T}"></see> with the specified value.
+        /// </summary>
+        /// <param name="value">A value that the <see cref = "StrongBox{T}"></see> will reference.</param>
+        public StrongBox(T value)
+        {
+            Value = value;
+        }
+
+        object IStrongBox.Value
+        {
+            get
+            {
+                return Value;
+            }
+            set
+            {
+                Value = (T)value;
+            }
+        }
+    }
+
+    /// <summary>
+    /// Defines a property for accessing the value that an object references.
+    /// </summary>
+    public interface IStrongBox
+    {
+        /// <summary>
+        /// Gets or sets the value the object references.
+        /// </summary>
+        object Value { get; set; }
+    }
+}
diff --git a/src/System.Runtime/src/project.json b/src/System.Runtime/src/project.json
new file mode 100644
index 0000000000..54912e4a28
--- /dev/null
+++ b/src/System.Runtime/src/project.json
@@ -0,0 +1,5 @@
+{
+  "dependencies": {
+    "Microsoft.DotNet.CoreCLR": "1.0.0-prerelease"
+  }
+}
\ No newline at end of file
diff --git a/src/System.Runtime/tests/System.Runtime.Tests.csproj b/src/System.Runtime/tests/System.Runtime.Tests.csproj
index 6fa2987580..a668e4967e 100644
--- a/src/System.Runtime/tests/System.Runtime.Tests.csproj
+++ b/src/System.Runtime/tests/System.Runtime.Tests.csproj
@@ -94,6 +94,12 @@
       <Project>{be8ed8c1-c314-4c4e-a929-64c9c8b3552a}</Project>
       <Name>XunitTraitsDiscoverers</Name>
     </ProjectReference>
+    <!-- Compile tests against the System.Runtime contract, but copy our local-built implementation for testing -->
+    <ProjectReference Include="..\src\System.Runtime.CoreCLR.csproj">
+      <ReferenceOutputAssembly>false</ReferenceOutputAssembly>
+      <OutputItemType>Content</OutputItemType>
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </ProjectReference>
   </ItemGroup>
   <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), dir.targets))\dir.targets" />
 </Project>
\ No newline at end of file