Merged PR 710009: Merge BuildXL.Utilities.Collections into BuildXL.Utilities.Core

Folding all of Collections into BXL.Utilities.Core. The recommended way to create Nuget packages is to do 1 dll per package unless the dlls are supposed to always be used together. Collections is a part of Utilities and it shares a large subset of dependents with Utilities.Core, so merging them together to reduce the amount of dlls.

Private/Wdg/ExecutionLogSdk/Private.Wdg.ExecutionLogSdk.dsc

@@ -23,7 +23,6 @@ export const dll = BuildXLSdk.library({
         importFrom("BuildXL.Engine").Processes.dll,
         importFrom("BuildXL.Engine").Scheduler.dll,
         importFrom("BuildXL.Utilities").dll,
-        importFrom("BuildXL.Utilities").Collections.dll,
         importFrom("BuildXL.Utilities").Native.dll,
         importFrom("BuildXL.Utilities").Storage.dll,
         importFrom("BuildXL.Utilities").Utilities.Core.dll,

Public/Src/App/Bxl/Bxl.dsc

@@ -52,7 +52,6 @@ namespace Main {
             importFrom("BuildXL.Pips").dll,
             importFrom("BuildXL.Utilities").dll,
             importFrom("BuildXL.Utilities").Branding.dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Utilities").Configuration.dll,
             importFrom("BuildXL.Utilities").Interop.dll,
             importFrom("BuildXL.Utilities").Native.dll,

Public/Src/Cache/ContentStore/App/BuildXL.Cache.ContentStore.App.dsc

@@ -36,9 +36,8 @@ namespace App {
             importFrom("BuildXL.Cache.DistributedCache.Host").Service.dll,
             importFrom("BuildXL.Cache.DistributedCache.Host").Configuration.dll,
             importFrom("BuildXL.Utilities").dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Utilities").Utilities.Core.dll,
-
+            
             importFrom("Microsoft.IdentityModel.Clients.ActiveDirectory").pkg,
             importFrom("Newtonsoft.Json").pkg,
 

Public/Src/Cache/ContentStore/Distributed/BuildXL.Cache.ContentStore.Distributed.dsc

@@ -54,7 +54,6 @@ namespace Distributed {
             importFrom("BuildXL.Utilities").Branding.dll,
             importFrom("BuildXL.Utilities").KeyValueStore.dll,
             importFrom("BuildXL.Utilities").Native.dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Utilities").Utilities.Core.dll,
             ...importFrom("Sdk.Selfhost.RocksDbSharp").pkgs,
             Grpc.dll,

Public/Src/Cache/ContentStore/DistributedTest/BuildXL.Cache.ContentStore.Distributed.Test.dsc

@@ -81,7 +81,6 @@ namespace DistributedTest {
             importFrom("BuildXL.Cache.DistributedCache.Host").Service.dll,
             importFrom("BuildXL.Cache.DistributedCache.Host").Configuration.dll,
             importFrom("BuildXL.Utilities").dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Utilities").KeyValueStore.dll,
             importFrom("BuildXL.Utilities").Native.dll,
             importFrom("BuildXL.Utilities").Utilities.Core.dll,

Public/Src/Cache/ContentStore/InterfacesTest/BuildXL.Cache.ContentStore.Interfaces.Test.dsc

@@ -19,7 +19,6 @@ namespace InterfacesTest {
 
             importFrom("BuildXL.Cache.DistributedCache.Host").Configuration.dll,
             importFrom("BuildXL.Utilities").dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Utilities").Native.dll,
             importFrom("BuildXL.Utilities").Utilities.Core.dll,
             

Public/Src/Cache/ContentStore/Library/BuildXL.Cache.ContentStore.Library.dsc

@@ -40,7 +40,6 @@ namespace Library {
             ...importFrom("Sdk.Selfhost.RocksDbSharp").pkgs,
             importFrom("BuildXL.Utilities").Native.dll,
             importFrom("BuildXL.Utilities").Configuration.dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Cache.DistributedCache.Host").Configuration.dll,
             ...getGrpcPackages(true),
             ...getGrpcDotNetPackages(),

Public/Src/Cache/ContentStore/Test/BuildXL.Cache.ContentStore.Test.dsc

@@ -25,7 +25,6 @@ namespace Test {
             ),
             // TODO: This needs to be renamed to just utilities... but it is in a package in public/src
             importFrom("BuildXL.Utilities").dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Utilities").Native.dll,
             importFrom("BuildXL.Utilities").KeyValueStore.dll,
             importFrom("BuildXL.Utilities").Utilities.Core.dll,

Public/Src/Cache/ContentStore/Vsts/BuildXL.Cache.ContentStore.Vsts.dsc

@@ -18,7 +18,6 @@ namespace Vsts {
             UtilitiesCore.dll,
             ...BuildXLSdk.visualStudioServicesArtifactServicesWorkaround,
             importFrom("BuildXL.Utilities").dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Utilities").Native.dll,
             importFrom("BuildXL.Utilities").Authentication.dll,
             importFrom("BuildXL.Utilities").Utilities.Core.dll,

Public/Src/Cache/DistributedCache.Host/LauncherServer/BuildXL.Launcher.Server.dsc

@@ -24,7 +24,6 @@ namespace LauncherServer {
             importFrom("BuildXL.Cache.ContentStore").Interfaces.dll,
             importFrom("BuildXL.Cache.ContentStore").Distributed.dll,
             importFrom("BuildXL.Utilities").dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Utilities").Utilities.Core.dll,
 
             importFrom("Azure.Security.KeyVault.Secrets").pkg,

Public/Src/Cache/DistributedCache.Host/Service/BuildXL.Cache.Host.Service.dsc

@@ -28,7 +28,6 @@ namespace Service {
 
             importFrom("BuildXL.Utilities").dll,
             importFrom("BuildXL.Utilities").Branding.dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Utilities").Native.dll,
             importFrom("BuildXL.Utilities").Utilities.Core.dll,
 

Public/Src/Cache/DistributedCache.Host/Test/BuildXL.Cache.Host.Test.dsc

@@ -35,7 +35,6 @@ namespace Test {
 
             // Used by Launcher integration test
             importFrom("BuildXL.Utilities").dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Utilities").Utilities.Core.dll,
             importFrom("BuildXL.Cache.ContentStore").App.exe,
             ...addIfLazy(!BuildXLSdk.isFullFramework, () => [LauncherServer.exe]

Public/Src/Cache/Logging/Library/BuildXL.Cache.Logging.Library.dsc

@@ -20,7 +20,6 @@ namespace Library {
             importFrom("BuildXL.Cache.ContentStore").Library.dll,
             importFrom("BuildXL.Cache.DistributedCache.Host").Configuration.dll,
             importFrom("BuildXL.Utilities").dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Utilities").Utilities.Core.dll,
             importFrom("System.Threading.Tasks.Extensions").pkg,
             ...BuildXLSdk.systemThreadingTasksDataflowPackageReference,

Public/Src/Cache/MemoizationStore/Distributed/BuildXL.Cache.MemoizationStore.Distributed.dsc

@@ -20,7 +20,6 @@ namespace Distributed {
             importFrom("BuildXL.Cache.DistributedCache.Host").Configuration.dll,
             
             importFrom("BuildXL.Utilities").dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Utilities").Utilities.Core.dll,
             ...BuildXLSdk.bclAsyncPackages,
             ...importFrom("BuildXL.Cache.ContentStore").getSerializationPackages(true),

Public/Src/Cache/MemoizationStore/DistributedTest/BuildXL.Cache.MemoizationStore.Distributed.Test.dsc

@@ -40,7 +40,6 @@ namespace DistributedTest {
             importFrom("BuildXL.Cache.DistributedCache.Host").Configuration.dll,
 
             importFrom("BuildXL.Utilities").dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
 
             ...BuildXLSdk.fluentAssertionsWorkaround,
             ...BuildXLSdk.bclAsyncPackages,

Public/Src/Cache/MemoizationStore/Interfaces/BuildXL.Cache.MemoizationStore.Interfaces.dsc

@@ -16,7 +16,6 @@ namespace Interfaces {
             ContentStore.Interfaces.dll,
             ContentStore.Library.dll,
             importFrom("BuildXL.Utilities").dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Utilities").Utilities.Core.dll,
             ...BuildXLSdk.bclAsyncPackages,
             ...BuildXLSdk.systemMemoryDeployment,

Public/Src/Cache/MemoizationStore/InterfacesTest/BuildXL.Cache.MemoizationStore.Interfaces.Test.dsc

@@ -16,7 +16,6 @@ namespace InterfacesTest {
             Interfaces.dll,
             Library.dll,
             importFrom("BuildXL.Utilities").dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Utilities").Utilities.Core.dll,
             ...BuildXLSdk.bclAsyncPackages,
             ContentStore.Test.dll,

Public/Src/Cache/MemoizationStore/Library/BuildXL.Cache.MemoizationStore.Library.dsc

@@ -23,7 +23,6 @@ namespace Library {
             importFrom("BuildXL.Cache.DistributedCache.Host").Configuration.dll,
             
             importFrom("BuildXL.Utilities").dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Utilities").Utilities.Core.dll,
 
             ...BuildXLSdk.bclAsyncPackages,

Public/Src/Cache/MemoizationStore/Test/BuildXL.Cache.MemoizationStore.Test.dsc

@@ -34,7 +34,6 @@ namespace Test {
             Library.dll,
 
             importFrom("BuildXL.Utilities").dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Utilities").Utilities.Core.dll,
             ...BuildXLSdk.bclAsyncPackages,
             ...BuildXLSdk.fluentAssertionsWorkaround,

Public/Src/Cache/MemoizationStore/Vsts/BuildXL.Cache.MemoizationStore.Vsts.dsc

@@ -29,7 +29,6 @@ namespace Vsts {
             ...BuildXLSdk.systemThreadingTasksDataflowPackageReference,
             importFrom("BuildXL.Utilities").dll,
             importFrom("BuildXL.Utilities").Authentication.dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Utilities").Utilities.Core.dll,
         ],
         allowUnsafeBlocks: true,

Public/Src/Cache/Monitor/Library/BuildXL.Cache.Monitor.Library.dsc

@@ -14,7 +14,6 @@ namespace Library {
 
             importFrom("System.Collections.Immutable").pkg,
             importFrom("BuildXL.Utilities").dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Utilities").Native.dll,
             importFrom("BuildXL.Utilities").Utilities.Core.dll,
 

Public/Src/Cache/VerticalStore/Analyzer/BuildXL.Cache.Analyzer.dsc

@@ -18,7 +18,6 @@ namespace Analyzer {
             importFrom("BuildXL.Cache.ContentStore").UtilitiesCore.dll,
             importFrom("BuildXL.Cache.ContentStore").Interfaces.dll,
             importFrom("BuildXL.Cache.MemoizationStore").Interfaces.dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Engine").Scheduler.dll,
             importFrom("BuildXL.Utilities").dll,
             importFrom("BuildXL.Utilities").Configuration.dll,

Public/Src/Cache/VerticalStore/BasicFilesystem/BuildXL.Cache.BasicFilesystem.dsc

@@ -16,7 +16,6 @@ namespace BasicFilesystem {
             importFrom("BuildXL.Utilities").dll,
             importFrom("BuildXL.Utilities").Native.dll,
             importFrom("BuildXL.Utilities").Storage.dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Utilities").Configuration.dll,
             importFrom("BuildXL.Utilities").Utilities.Core.dll,
             importFrom("Newtonsoft.Json").pkg,

Public/Src/Cache/VerticalStore/Compositing/BuildXL.Cache.Compositing.dsc

@@ -13,7 +13,6 @@ namespace Compositing {
             importFrom("BuildXL.Cache.ContentStore").Interfaces.dll,
             importFrom("BuildXL.Utilities").dll,
             importFrom("BuildXL.Utilities").Storage.dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Utilities").Configuration.dll,
             importFrom("BuildXL.Utilities").Utilities.Core.dll,
         ],

Public/Src/Cache/VerticalStore/ImplementationSupport/BuildXL.Cache.ImplementationSupport.dsc

@@ -12,7 +12,6 @@ namespace ImplementationSupport {
             importFrom("BuildXL.Cache.ContentStore").Interfaces.dll,
             importFrom("BuildXL.Utilities").dll,
             importFrom("BuildXL.Utilities").Storage.dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Utilities").Utilities.Core.dll,
             importFrom("Newtonsoft.Json").pkg,
         ],

Public/Src/Cache/VerticalStore/InMemory/BuildXL.Cache.InMemory.dsc

@@ -14,7 +14,6 @@ namespace InMemory {
             importFrom("BuildXL.Utilities").dll,          
             importFrom("BuildXL.Utilities").Native.dll,
             importFrom("BuildXL.Utilities").Storage.dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Utilities").Configuration.dll,
             importFrom("BuildXL.Utilities").Utilities.Core.dll,
         ],

Public/Src/Cache/VerticalStore/InputListFilter/BuildXL.Cache.InputListFilter.dsc

@@ -14,7 +14,6 @@ namespace InputListFilter {
             importFrom("BuildXL.Engine").Scheduler.dll,
             importFrom("BuildXL.Utilities").dll,
             importFrom("BuildXL.Utilities").Storage.dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Utilities").Configuration.dll,
             importFrom("BuildXL.Utilities").Utilities.Core.dll,
         ],

Public/Src/Cache/VerticalStore/Interfaces/BuildXL.Cache.Interfaces.dsc

@@ -18,7 +18,6 @@ namespace Interfaces {
             importFrom("BuildXL.Utilities").dll,
             importFrom("BuildXL.Utilities").Native.dll,
             importFrom("BuildXL.Utilities").Storage.dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Utilities").Configuration.dll,
             importFrom("BuildXL.Utilities").Utilities.Core.dll,
             importFrom("Newtonsoft.Json").pkg,

Public/Src/Cache/VerticalStore/MemoizationStoreAdapter/BuildXL.Cache.MemoizationStoreAdapter.dsc

@@ -11,7 +11,6 @@ namespace MemoizationStoreAdapter {
         references: [
             Interfaces.dll,
             importFrom("BuildXL.Utilities").dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Utilities").Configuration.dll,
             importFrom("BuildXL.Utilities").Native.dll,
             importFrom("BuildXL.Utilities").Storage.dll,

Public/Src/Cache/VerticalStore/UnitTests/Analyzer/Test.BuildXL.Cache.Analyzer.dsc

@@ -19,7 +19,6 @@ namespace Analyzer {
             importFrom("BuildXL.Utilities").Native.dll,
             importFrom("BuildXL.Utilities").Storage.dll,
             importFrom("BuildXL.Utilities").ToolSupport.dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Utilities").Configuration.dll,
             importFrom("BuildXL.Utilities").Utilities.Core.dll,
             Interfaces.dll,

Public/Src/Cache/VerticalStore/UnitTests/InputListFilter/Test.BuildXL.Cache.InputListFilter.dsc

@@ -13,7 +13,6 @@ namespace InputListFilter {
             importFrom("BuildXL.Cache.VerticalStore").InMemory.dll,
             importFrom("BuildXL.Cache.VerticalStore").VerticalAggregator.dll,
             importFrom("BuildXL.Engine").Scheduler.dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Utilities").Configuration.dll,
             Interfaces.dll,
             VerticalAggregator.dll,

Public/Src/Cache/VerticalStore/UnitTests/Interfaces/Test.BuildXL.Cache.Interfaces.dsc

@@ -19,7 +19,6 @@ namespace Interfaces {
             importFrom("BuildXL.Cache.VerticalStore").ImplementationSupport.dll,
             importFrom("BuildXL.Cache.VerticalStore").InMemory.dll,
             importFrom("BuildXL.Cache.VerticalStore").Interfaces.dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
         ],
     });
 }

Public/Src/Demos/BlockAccesses/BlockAccesses.dsc

@@ -10,7 +10,6 @@ namespace BlockAccesses {
             importFrom("BuildXL.Engine").Processes.dll,
             importFrom("BuildXL.Engine").ProcessPipExecutor.dll,
             importFrom("BuildXL.Pips").dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Utilities").dll,
             importFrom("BuildXL.Utilities").Native.dll,
             importFrom("BuildXL.Utilities").Utilities.Core.dll,

Public/Src/Demos/ReportAccesses/ReportAccesses.dsc

@@ -10,7 +10,6 @@ namespace ReportAccesses {
             importFrom("BuildXL.Engine").Processes.dll,
             importFrom("BuildXL.Engine").ProcessPipExecutor.dll,
             importFrom("BuildXL.Pips").dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Utilities").dll,
             importFrom("BuildXL.Utilities").Native.dll,
             importFrom("BuildXL.Utilities").Utilities.Core.dll,

Public/Src/Demos/ReportProcesses/ReportProcesses.dsc

@@ -10,7 +10,6 @@ namespace ReportProcesses {
             importFrom("BuildXL.Engine").Processes.dll,
             importFrom("BuildXL.Engine").ProcessPipExecutor.dll,
             importFrom("BuildXL.Pips").dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Utilities").dll,
             importFrom("BuildXL.Utilities").Native.dll,
             importFrom("BuildXL.Utilities").Utilities.Core.dll,

Public/Src/Deployment/NugetPackages.dsc

@@ -112,12 +112,6 @@ namespace NugetPackages {
             importFrom("BuildXL.Utilities").withQualifier(net7PackageQualifier).Branding.dll,
             importFrom("BuildXL.Utilities").withQualifier(netstandard20PackageQualifier).Branding.dll,
 
-            // BuildXL.Collections
-            importFrom("BuildXL.Utilities").withQualifier(net472packageQualifier).Collections.dll,
-            importFrom("BuildXL.Utilities").withQualifier(net6PackageQualifier).Collections.dll,
-            importFrom("BuildXL.Utilities").withQualifier(net7PackageQualifier).Collections.dll,
-            importFrom("BuildXL.Utilities").withQualifier(netstandard20PackageQualifier).Collections.dll,
-
             // BuildXL.Interop
             importFrom("BuildXL.Utilities").withQualifier(net472packageQualifier).Interop.dll,
             importFrom("BuildXL.Utilities").withQualifier(net6PackageQualifier).Interop.dll,

Public/Src/Engine/Cache.Plugin.CacheCore/BuildXL.Cache.Plugin.CacheCore.dsc

@@ -18,7 +18,6 @@ namespace Cache.Plugin.Core {
             importFrom("BuildXL.Utilities").Native.dll,
             importFrom("BuildXL.Utilities").Storage.dll,
             importFrom("BuildXL.Utilities").Configuration.dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Utilities").Utilities.Core.dll,
         ],
     });

Public/Src/Engine/Cache/BuildXL.Cache.dsc

@@ -32,7 +32,6 @@ namespace Cache {
             importFrom("BuildXL.Utilities").dll,
             importFrom("BuildXL.Utilities").Native.dll,
             importFrom("BuildXL.Utilities").Storage.dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Utilities").Configuration.dll,
             importFrom("BuildXL.Utilities").Utilities.Core.dll,
             importFrom("JsonDiffPatch.Net").pkg,

Public/Src/Engine/Dll/BuildXL.Engine.dsc

@@ -42,7 +42,6 @@ namespace Engine {
             importFrom("BuildXL.Ide").Generator.dll,
             importFrom("BuildXL.Ide").Generator.Old.dll,
             importFrom("BuildXL.Utilities").dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Utilities").Configuration.dll,
             importFrom("BuildXL.Utilities").Native.dll,
             importFrom("BuildXL.Utilities").Interop.dll,

Public/Src/Engine/ProcessPipExecutor/BuildXL.ProcessPipExecutor.dsc

@@ -21,7 +21,6 @@ namespace ProcessPipExecutor {
             importFrom("BuildXL.Utilities").dll,
             importFrom("BuildXL.Utilities").Native.dll,
             importFrom("BuildXL.Utilities").Interop.dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Utilities").Configuration.dll,
             importFrom("BuildXL.Utilities").Plugin.dll,
             importFrom("BuildXL.Utilities").PluginGrpc.dll,

Public/Src/Engine/Processes.External/BuildXL.Processes.External.dsc

@@ -27,7 +27,6 @@ namespace Processes.External {
             importFrom("BuildXL.Pips").dll,
             importFrom("BuildXL.Utilities").Native.dll,
             importFrom("BuildXL.Utilities").Interop.dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Utilities").Configuration.dll,
             importFrom("BuildXL.Utilities").Utilities.Core.dll,
             

Public/Src/Engine/Processes/BuildXL.Processes.dsc

@@ -35,7 +35,6 @@ namespace Processes {
             ),
             importFrom("BuildXL.Utilities").Native.dll,
             importFrom("BuildXL.Utilities").Interop.dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Utilities").Utilities.Core.dll,
         ],
         internalsVisibleTo: [

Public/Src/Engine/Scheduler/BuildXL.Scheduler.dsc

@@ -37,7 +37,6 @@ namespace Scheduler {
             importFrom("BuildXL.Pips").dll,
             importFrom("BuildXL.Utilities").dll,
             importFrom("BuildXL.Utilities").Branding.dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Utilities").Configuration.dll,
             importFrom("BuildXL.Utilities").Interop.dll,
             importFrom("BuildXL.Utilities").Ipc.dll,

Public/Src/Engine/UnitTests/Cache.Plugin.CacheCore/Test.BuildXL.Cache.Plugin.CacheCore.dsc

@@ -20,7 +20,6 @@ namespace Cache.Plugin.Core {
             importFrom("BuildXL.Utilities").Native.dll,
             importFrom("BuildXL.Utilities").Storage.dll,
             importFrom("BuildXL.Utilities").Configuration.dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Utilities").Utilities.Core.dll,
         ],
     });

Public/Src/Engine/UnitTests/Cache/Test.BuildXL.Cache.dsc

@@ -19,7 +19,6 @@ namespace Cache {
             importFrom("BuildXL.Utilities").Storage.dll,
             importFrom("BuildXL.Utilities.UnitTests").StorageTestUtilities.dll,
             importFrom("BuildXL.Utilities").Configuration.dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Utilities").Utilities.Core.dll,
             importFrom("Newtonsoft.Json").pkg,			
         ],

Public/Src/Engine/UnitTests/Engine/Test.BuildXL.Engine.dsc

@@ -92,7 +92,6 @@ namespace Engine {
             importFrom("BuildXL.Engine").ViewModel.dll,
             importFrom("BuildXL.Pips").dll,
             importFrom("BuildXL.Utilities").dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Utilities").Configuration.dll,
             importFrom("BuildXL.Utilities").Native.dll,
             importFrom("BuildXL.Utilities").Storage.dll,

Public/Src/Engine/UnitTests/EngineTestUtilities/Test.BuildXL.EngineTestUtilities.dsc

@@ -20,7 +20,6 @@ namespace EngineTestUtilities {
             importFrom("BuildXL.Engine").Scheduler.dll,
             importFrom("BuildXL.Pips").dll,  
             importFrom("BuildXL.Utilities").dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Utilities").Configuration.dll,
             importFrom("BuildXL.Utilities").Native.dll,
             importFrom("BuildXL.Utilities").Ipc.dll, 

Public/Src/Engine/UnitTests/ExternalToolTests/ExternalToolTest.BuildXL.Scheduler.dsc

@@ -29,7 +29,6 @@ namespace ExternalToolTest {
             importFrom("BuildXL.Engine").Scheduler.dll,
             importFrom("BuildXL.Pips").dll,
             importFrom("BuildXL.Utilities").dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Utilities").Configuration.dll,
             importFrom("BuildXL.Utilities").Native.dll,
             importFrom("BuildXL.Utilities").Utilities.Core.dll,

Public/Src/Engine/UnitTests/Processes.Detours/Test.BuildXL.Processes.Detours.dsc

@@ -47,7 +47,6 @@ namespace Processes.Detours {
                 importFrom("BuildXL.Utilities").dll,
                 importFrom("BuildXL.Utilities").Native.dll,
                 importFrom("BuildXL.Utilities").Storage.dll,
-                importFrom("BuildXL.Utilities").Collections.dll,
                 importFrom("BuildXL.Utilities").Configuration.dll,
                 importFrom("BuildXL.Utilities").Plugin.dll,
                 importFrom("BuildXL.Utilities").Utilities.Core.dll,

Public/Src/Engine/UnitTests/Processes.TestPrograms/DetoursCrossBitTests/DetoursCrossBitTests.dsc

@@ -31,7 +31,6 @@ namespace Processes.TestPrograms.DetoursCrossBitTests {
             importFrom("BuildXL.Utilities").Ipc.dll,
             importFrom("BuildXL.Utilities").Native.dll,
             importFrom("BuildXL.Utilities").Storage.dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Utilities").Configuration.dll,
             importFrom("BuildXL.Utilities").Utilities.Core.dll,
             importFrom("BuildXL.Utilities.UnitTests").TestUtilities.dll,

Public/Src/Engine/UnitTests/Processes/Test.BuildXL.Processes.dsc

@@ -56,7 +56,6 @@ namespace Processes {
             importFrom("BuildXL.Engine").Scheduler.dll,
             importFrom("BuildXL.Utilities").dll,
             importFrom("BuildXL.Utilities").Configuration.dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Utilities").Interop.dll,
             importFrom("BuildXL.Utilities").Native.dll,
             importFrom("BuildXL.Utilities").Storage.dll,

Public/Src/Engine/UnitTests/RuntimeAnalyzer/Test.BuildXL.RuntimeAnalyzer.dsc

@@ -26,7 +26,6 @@ namespace Test.BuildXL.RuntimeAnalyzer {
             importFrom("BuildXL.Utilities").dll,
             importFrom("BuildXL.Utilities").Configuration.dll,
             importFrom("BuildXL.Utilities").Native.dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Utilities").Utilities.Core.dll,
             importFrom("BuildXL.Utilities.UnitTests").TestProcess.exe
         ],

Public/Src/Engine/UnitTests/Scheduler.IntegrationTest/IntegrationTest.BuildXL.Scheduler.dsc

@@ -35,7 +35,6 @@ namespace Scheduler.IntegrationTest {
             importFrom("BuildXL.Engine").ViewModel.dll,
             importFrom("BuildXL.Pips").dll,
             importFrom("BuildXL.Utilities").dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Utilities").Configuration.dll,
             importFrom("BuildXL.Utilities").Native.dll,
             importFrom("BuildXL.Utilities").Interop.dll,

Public/Src/Engine/UnitTests/Scheduler/Test.BuildXL.Scheduler.dsc

@@ -47,7 +47,6 @@ namespace Scheduler {
             importFrom("BuildXL.Engine").Scheduler.dll,
             importFrom("BuildXL.Pips").dll,
             importFrom("BuildXL.Utilities").dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Utilities").Configuration.dll,
             importFrom("BuildXL.Utilities.Instrumentation").Tracing.dll,
             importFrom("BuildXL.Utilities").Ipc.dll,

Public/Src/FrontEnd/CMake.Serialization/BuildXL.FrontEnd.Ninja.Serialization.dsc

@@ -10,7 +10,6 @@ namespace CMake.Serialization {
         references: [
             importFrom("Newtonsoft.Json").pkg,
             importFrom("BuildXL.Utilities").dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
         ],
     });
 }

Public/Src/FrontEnd/CMake/BuildXL.FrontEnd.CMake.dsc

@@ -20,7 +20,6 @@ namespace CMake {
             importFrom("BuildXL.Engine").Processes.dll,
             importFrom("BuildXL.Pips").dll,
             importFrom("BuildXL.Utilities").dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Utilities").Configuration.dll,
             importFrom("BuildXL.Utilities").Script.Constants.dll,
             importFrom("BuildXL.Utilities").Storage.dll,

Public/Src/FrontEnd/Core/BuildXL.FrontEnd.Core.dsc

@@ -24,7 +24,6 @@ namespace Core {
             importFrom("BuildXL.Engine").Cache.dll,
             importFrom("BuildXL.Pips").dll,
             importFrom("BuildXL.Utilities").dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Utilities").Configuration.dll,
             importFrom("BuildXL.Utilities").Native.dll,
             importFrom("BuildXL.Utilities").Storage.dll,

Public/Src/FrontEnd/Download/BuildXL.FrontEnd.Download.dsc

@@ -23,7 +23,6 @@ namespace Download {
             importFrom("BuildXL.Cache.ContentStore").Hashing.dll,
             importFrom("BuildXL.Pips").dll,
             importFrom("BuildXL.Utilities").dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Utilities").Configuration.dll,
             importFrom("BuildXL.Utilities").Interop.dll,
             importFrom("BuildXL.Utilities").Native.dll,

Public/Src/FrontEnd/Factory/BuildXL.FrontEnd.Factory.dsc

@@ -17,7 +17,6 @@ namespace Factory {
             importFrom("BuildXL.Ide").Script.Debugger.dll,
             importFrom("BuildXL.Ide").VSCode.DebugProtocol.dll,
             importFrom("BuildXL.Utilities").dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Utilities").Configuration.dll,
             importFrom("BuildXL.Utilities").Utilities.Core.dll,
 

Public/Src/FrontEnd/JavaScript/BuildXL.FrontEnd.JavaScript.dsc

@@ -22,7 +22,6 @@ namespace JavaScript {
             importFrom("BuildXL.Engine").Processes.dll,
             importFrom("BuildXL.Pips").dll,
             importFrom("BuildXL.Utilities").dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Utilities").Configuration.dll,
             importFrom("BuildXL.Utilities").Script.Constants.dll,
             importFrom("BuildXL.Utilities").Storage.dll,

Public/Src/FrontEnd/Lage/BuildXL.FrontEnd.Lage.dsc

@@ -21,7 +21,6 @@ namespace Lage {
             importFrom("BuildXL.Engine").Processes.dll,
             importFrom("BuildXL.Pips").dll,
             importFrom("BuildXL.Utilities").dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Utilities").Configuration.dll,
             importFrom("BuildXL.Utilities").Script.Constants.dll,
             importFrom("BuildXL.Utilities").Storage.dll,

Public/Src/FrontEnd/MsBuild/BuildXL.FrontEnd.MsBuild.dsc

@@ -19,7 +19,6 @@ namespace MsBuild {
             importFrom("BuildXL.Engine").Processes.dll,
             importFrom("BuildXL.Pips").dll,
             importFrom("BuildXL.Utilities").dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Utilities").Configuration.dll,
             importFrom("BuildXL.Utilities").Script.Constants.dll,
             importFrom("BuildXL.Utilities").Storage.dll,

Public/Src/FrontEnd/Ninja.Serialization/BuildXL.FrontEnd.Ninja.Serialization.dsc

@@ -10,7 +10,6 @@ namespace Ninja.Serialization {
         references: [
             importFrom("Newtonsoft.Json").pkg,
             importFrom("BuildXL.Utilities").dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Utilities").Utilities.Core.dll,
         ],
     });

Public/Src/FrontEnd/Ninja/BuildXL.FrontEnd.Ninja.dsc

@@ -20,7 +20,6 @@ namespace Ninja {
             importFrom("BuildXL.Engine").ProcessPipExecutor.dll,
             importFrom("BuildXL.Pips").dll,
             importFrom("BuildXL.Utilities").dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Utilities").Configuration.dll,
             importFrom("BuildXL.Utilities").Script.Constants.dll,
             importFrom("BuildXL.Utilities").Storage.dll,

Public/Src/FrontEnd/Nuget/BuildXL.FrontEnd.Nuget.dsc

@@ -37,7 +37,6 @@ namespace Nuget {
             importFrom("BuildXL.Pips").dll,
             importFrom("BuildXL.Utilities").dll,
             importFrom("BuildXL.Utilities").VstsAuthentication.dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Utilities").Configuration.dll,
             importFrom("BuildXL.Utilities").Interop.dll,
             importFrom("BuildXL.Utilities").Native.dll,

Public/Src/FrontEnd/Rush/BuildXL.FrontEnd.Rush.dsc

@@ -21,7 +21,6 @@ namespace Rush {
             importFrom("BuildXL.Engine").Processes.dll,
             importFrom("BuildXL.Pips").dll,
             importFrom("BuildXL.Utilities").dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Utilities").Configuration.dll,
             importFrom("BuildXL.Utilities").Script.Constants.dll,
             importFrom("BuildXL.Utilities").Storage.dll,

Public/Src/FrontEnd/Script/BuildXL.FrontEnd.Script.dsc

@@ -32,7 +32,6 @@ namespace Script {
             importFrom("BuildXL.Ide").VSCode.DebugProtocol.dll,
             importFrom("BuildXL.Pips").dll,
             importFrom("BuildXL.Utilities").dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Utilities").Configuration.dll,
             importFrom("BuildXL.Utilities").Native.dll,
             importFrom("BuildXL.Utilities").Interop.dll,

Public/Src/FrontEnd/Sdk/BuildXL.FrontEnd.Sdk.dsc

@@ -19,7 +19,6 @@ namespace Sdk {
             importFrom("BuildXL.Engine").Cache.dll,
             importFrom("BuildXL.Pips").dll,
             importFrom("BuildXL.Utilities").dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Utilities").Configuration.dll,
             importFrom("BuildXL.Utilities").Native.dll,
             importFrom("BuildXL.Utilities").Script.Constants.dll,

Public/Src/FrontEnd/SdkTesting/Helper/BuildXL.FrontEnd.Script.Testing.Helper.dsc

@@ -18,7 +18,6 @@ namespace Helper {
             importFrom("BuildXL.Engine").Engine.dll,
             importFrom("BuildXL.Engine").Scheduler.dll,
             importFrom("BuildXL.Utilities").Configuration.dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.FrontEnd").Core.dll,
             importFrom("BuildXL.FrontEnd").Script.dll,
             importFrom("BuildXL.FrontEnd").Sdk.dll,

Public/Src/FrontEnd/TypeScript.Net/TypeScript.Net/TypeScript.Net.dsc

@@ -14,7 +14,6 @@ namespace TypeScript.Net {
                 NetFx.Microsoft.CSharp.dll
             ),
             importFrom("BuildXL.Utilities").dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Utilities").Script.Constants.dll,
             importFrom("BuildXL.Utilities").Utilities.Core.dll,
             ...addIf(BuildXLSdk.isFullFramework,

Public/Src/FrontEnd/UnitTests/Core/Test.BuildXL.FrontEnd.Core.dsc

@@ -25,7 +25,6 @@ namespace Core {
             importFrom("BuildXL.FrontEnd").TypeScript.Net.dll,
             importFrom("BuildXL.Pips").dll,
             importFrom("BuildXL.Utilities").dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Utilities").Configuration.dll,
             importFrom("BuildXL.Utilities").Native.dll,
             importFrom("BuildXL.Utilities").Storage.dll,

Public/Src/FrontEnd/UnitTests/Download/Test.BuildXL.FrontEnd.Download.dsc

@@ -17,7 +17,6 @@ namespace Download {
             importFrom("BuildXL.Engine").Processes.dll,
             importFrom("BuildXL.Pips").dll,
             importFrom("BuildXL.Utilities").dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Utilities").Configuration.dll,
             importFrom("BuildXL.Utilities").Script.Constants.dll,
             importFrom("BuildXL.Utilities").Utilities.Core.dll,

Public/Src/FrontEnd/UnitTests/Lage/Test.BuildXL.FrontEnd.Lage.dsc

@@ -47,7 +47,6 @@ namespace Test.Lage {
             importFrom("BuildXL.FrontEnd").SdkProjectGraph.dll,
             importFrom("BuildXL.Pips").dll,
             importFrom("BuildXL.Utilities").dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Utilities").Configuration.dll,
             importFrom("BuildXL.Utilities").Native.dll,
             importFrom("BuildXL.Utilities").Script.Constants.dll,

Public/Src/FrontEnd/UnitTests/MsBuild/Test.BuildXL.FrontEnd.MsBuild.dsc

@@ -39,7 +39,6 @@ namespace Test.MsBuild {
             importFrom("BuildXL.FrontEnd").SdkProjectGraph.dll,
             importFrom("BuildXL.Pips").dll,
             importFrom("BuildXL.Utilities").dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Utilities").Configuration.dll,
             importFrom("BuildXL.Utilities").Native.dll,
             importFrom("BuildXL.Utilities").Script.Constants.dll,

Public/Src/FrontEnd/UnitTests/Ninja/Test.BuildXL.FrontEnd.Ninja.dsc

@@ -17,7 +17,6 @@ namespace Test.Ninja {
         sources: globR(d`.`, "*.cs"),
         references: [
             importFrom("BuildXL.Utilities").dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Utilities").Configuration.dll,
             importFrom("BuildXL.Utilities").Script.Constants.dll,
             importFrom("BuildXL.Utilities").Utilities.Core.dll,

Public/Src/FrontEnd/UnitTests/Nuget/Test.BuildXL.FrontEnd.Nuget.dsc

@@ -23,7 +23,6 @@ namespace Nuget {
             importFrom("BuildXL.FrontEnd").Sdk.dll,
             importFrom("BuildXL.FrontEnd").TypeScript.Net.dll,
             importFrom("BuildXL.Utilities").dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Utilities").Configuration.dll,
             importFrom("BuildXL.Utilities").Script.Constants.dll,
             importFrom("BuildXL.Utilities").Storage.dll,

Public/Src/FrontEnd/UnitTests/Rush/Test.BuildXL.FrontEnd.Rush.dsc

@@ -69,7 +69,6 @@ namespace Test.Rush {
             importFrom("BuildXL.FrontEnd").SdkProjectGraph.dll,
             importFrom("BuildXL.Pips").dll,
             importFrom("BuildXL.Utilities").dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Utilities").Configuration.dll,
             importFrom("BuildXL.Utilities").Native.dll,
             importFrom("BuildXL.Utilities").Script.Constants.dll,

Public/Src/FrontEnd/UnitTests/Script.Ast/Test.BuildXL.FrontEnd.Script.dsc

@@ -52,7 +52,6 @@ namespace Script {
             importFrom("BuildXL.Engine").Scheduler.dll,
             importFrom("BuildXL.Engine").ViewModel.dll,
             importFrom("BuildXL.Utilities").dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Utilities").Configuration.dll,
             importFrom("BuildXL.Utilities").Ipc.dll,
             importFrom("BuildXL.Utilities").Native.dll,

Public/Src/FrontEnd/UnitTests/Script.TestBase/Test.BuildXL.FrontEnd.Script.TestBase.dsc

@@ -19,7 +19,6 @@ namespace Script.TestBase {
             importFrom("BuildXL.FrontEnd").Script.dll,
             importFrom("BuildXL.FrontEnd").Sdk.dll,
             importFrom("BuildXL.Utilities").dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Utilities").Configuration.dll,
             importFrom("BuildXL.Utilities").Utilities.Core.dll,
             importFrom("BuildXL.Utilities.UnitTests").TestUtilities.dll,

Public/Src/FrontEnd/UnitTests/Script.Workspaces.Utilities/Test.BuildXL.FrontEnd.Workspaces.Utilities.dsc

@@ -12,7 +12,6 @@ namespace Workspaces.Utilities {
             importFrom("BuildXL.FrontEnd").TypeScript.Net.dll,
             importFrom("BuildXL.Utilities").dll,
             importFrom("BuildXL.Utilities").Configuration.dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Utilities").Native.dll,
             importFrom("BuildXL.Utilities").Script.Constants.dll,
             importFrom("BuildXL.Utilities").Utilities.Core.dll,

Public/Src/FrontEnd/UnitTests/Yarn/Test.BuildXL.FrontEnd.Yarn.dsc

@@ -44,7 +44,6 @@ namespace Test.Yarn {
             importFrom("BuildXL.FrontEnd").SdkProjectGraph.dll,
             importFrom("BuildXL.Pips").dll,
             importFrom("BuildXL.Utilities").dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Utilities").Configuration.dll,
             importFrom("BuildXL.Utilities").Native.dll,
             importFrom("BuildXL.Utilities").Script.Constants.dll,

Public/Src/FrontEnd/Utilities/BuildXL.FrontEnd.Utilities.dsc

@@ -12,7 +12,6 @@ namespace Utilities {
             ...BuildXLSdk.tplPackages,
             importFrom("BuildXL.Pips").dll,
             importFrom("BuildXL.Utilities").dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Utilities").Configuration.dll,
             importFrom("BuildXL.Utilities").Interop.dll,
             importFrom("BuildXL.Utilities").Native.dll,

Public/Src/FrontEnd/Yarn/BuildXL.FrontEnd.Yarn.dsc

@@ -21,7 +21,6 @@ namespace Yarn {
             importFrom("BuildXL.Engine").Processes.dll,
             importFrom("BuildXL.Pips").dll,
             importFrom("BuildXL.Utilities").dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Utilities").Configuration.dll,
             importFrom("BuildXL.Utilities").Script.Constants.dll,
             importFrom("BuildXL.Utilities").Storage.dll,

Public/Src/IDE/Debugger/BuildXL.Ide.Script.Debugger.dsc

@@ -14,7 +14,6 @@ namespace Script.Debugger {
             VSCode.DebugProtocol.dll,
             importFrom("BuildXL.Pips").dll,
             importFrom("BuildXL.Utilities").dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Utilities").Configuration.dll,
             importFrom("BuildXL.Utilities").Utilities.Core.dll,
             importFrom("BuildXL.FrontEnd").Core.dll,

Public/Src/IDE/Generator.Old/BuildXL.Ide.Generator.Old.dsc

@@ -14,7 +14,6 @@ namespace Generator.Old {
                 NetFx.System.Xml.Linq.dll
             ),
             importFrom("BuildXL.Engine").Scheduler.dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Utilities").Configuration.dll,
             importFrom("BuildXL.Pips").dll,
             importFrom("BuildXL.Utilities").dll,

Public/Src/IDE/Generator/BuildXL.Ide.Generator.dsc

@@ -14,7 +14,6 @@ namespace Generator {
                 NetFx.System.Xml.Linq.dll
             ),
             importFrom("BuildXL.Engine").Scheduler.dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Utilities").Configuration.dll,
             importFrom("BuildXL.Pips").dll,
             importFrom("BuildXL.Utilities").dll,

Public/Src/IDE/LanguageServer/BuildXL.Ide.LanguageServer.dsc

@@ -44,7 +44,6 @@ namespace LanguageService.Server {
             importFrom("BuildXL.Tools").BxlScriptAnalyzer.exe,
             importFrom("BuildXL.Tools").BxlPipGraphFragmentGenerator.exe,
             importFrom("BuildXL.Utilities").dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Utilities").Configuration.dll,
             importFrom("BuildXL.Utilities").Native.dll,
             importFrom("BuildXL.Utilities").Script.Constants.dll,

Public/Src/Pips/Dll/BuildXL.Pips.dsc

@@ -24,7 +24,6 @@ export const dll = BuildXLSdk.library({
         importFrom("BuildXL.Utilities").Interop.dll,
         importFrom("BuildXL.Utilities").Ipc.dll,
         importFrom("BuildXL.Utilities").Storage.dll,
-        importFrom("BuildXL.Utilities").Collections.dll,
         importFrom("BuildXL.Utilities").Configuration.dll,
         importFrom("BuildXL.Utilities").Utilities.Core.dll,
         importFrom("BuildXL.Utilities.Instrumentation").AriaCommon.dll,

Public/Src/Pips/UnitTests/Pips/Test.BuildXL.Pips.dsc

@@ -23,7 +23,6 @@ namespace Core {
             importFrom("BuildXL.Utilities").Native.dll,
             importFrom("BuildXL.Utilities").Ipc.dll,
             importFrom("BuildXL.Utilities").Storage.dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Utilities").Utilities.Core.dll,
         ],
     });

Public/Src/Tools/BxlPipGraphFragmentGenerator/BxlPipGraphFragmentGenerator.dsc

@@ -20,7 +20,6 @@ namespace BxlPipGraphFragmentGenerator {
             importFrom("BuildXL.Pips").dll,
             importFrom("BuildXL.Utilities").dll,
             importFrom("BuildXL.Utilities").Configuration.dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Utilities").Ipc.dll,
             importFrom("BuildXL.Utilities").Native.dll,
             importFrom("BuildXL.Utilities").Script.Constants.dll,

Public/Src/Tools/BxlScriptAnalyzer/BxlScriptAnalyzer.dsc

@@ -21,7 +21,6 @@ namespace BxlScriptAnalyzer {
             importFrom("BuildXL.Pips").dll,
             importFrom("BuildXL.Utilities").dll,
             importFrom("BuildXL.Utilities").Configuration.dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Utilities").Ipc.dll,
             importFrom("BuildXL.Utilities").Native.dll,
             importFrom("BuildXL.Utilities").Script.Constants.dll,

Public/Src/Tools/DropDaemon/Tool.DropDaemon.dsc

@@ -22,7 +22,6 @@ export namespace DropDaemon {
             importFrom("BuildXL.Utilities.Instrumentation").Tracing.dll,
             importFrom("BuildXL.Utilities").dll,
             importFrom("BuildXL.Utilities").Authentication.dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Utilities").Ipc.dll,
             importFrom("BuildXL.Utilities").Ipc.Providers.dll,
             importFrom("BuildXL.Utilities").Native.dll,

Public/Src/Tools/Execution.Analyzer/BxlAnalyzer.dsc

@@ -55,7 +55,6 @@ namespace Execution.Analyzer {
             importFrom("BuildXL.Utilities").ToolSupport.dll,
             importFrom("BuildXL.Utilities.Instrumentation").AriaCommon.dll,
             importFrom("BuildXL.Utilities.Instrumentation").Tracing.dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Utilities").Configuration.dll,
             importFrom("BuildXL.Utilities").Utilities.Core.dll,
             importFrom("Newtonsoft.Json").pkg,

Public/Src/Tools/FileDownloader/Tool.FileDownloader.dsc

@@ -22,7 +22,6 @@ namespace FileDownloader {
         references:[
             importFrom("Newtonsoft.Json").pkg,
             importFrom("BuildXL.Utilities").VstsAuthentication.dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Utilities").Native.dll,
             importFrom("BuildXL.Utilities").ToolSupport.dll,
             importFrom("BuildXL.Utilities").Storage.dll,
@@ -41,7 +40,6 @@ namespace FileDownloader {
         skipDefaultReferences: true,
         sources: globR(d`.`, "Extractor*.cs"),
         references:[
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Utilities").Native.dll,
             importFrom("BuildXL.Utilities").Configuration.dll,
             importFrom("BuildXL.Utilities").ToolSupport.dll,

Public/Src/Tools/MaterializationDaemon/Tool.MaterializationDaemon.dsc

@@ -24,7 +24,6 @@ export const exe = !BuildXLSdk.isDaemonToolingEnabled ? undefined : BuildXLSdk.e
         importFrom("BuildXL.Utilities").Ipc.Providers.dll,
         importFrom("BuildXL.Utilities").Native.dll,
         importFrom("BuildXL.Utilities").Storage.dll,
-        importFrom("BuildXL.Utilities").Collections.dll,
         importFrom("BuildXL.Utilities").Utilities.Core.dll,
         importFrom("BuildXL.Tools").ServicePipDaemon.dll,
 

Public/Src/Tools/SandboxedProcessExecutor/SandboxedProcessExecutor.dsc

@@ -18,7 +18,6 @@ namespace SandboxedProcessExecutor {
         sources: globR(d`.`, "*.cs"),
         references: [
             importFrom("BuildXL.Utilities").dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Utilities").Interop.dll,
             importFrom("BuildXL.Utilities").Native.dll,
             importFrom("BuildXL.Utilities").ToolSupport.dll,

Public/Src/Tools/SymbolDaemon/Tool.SymbolDaemon.dsc

@@ -28,7 +28,6 @@ export const exe = !BuildXLSdk.isSymbolToolingEnabled ? undefined : BuildXLSdk.e
         importFrom("BuildXL.Utilities").Ipc.Providers.dll,
         importFrom("BuildXL.Utilities").Native.dll,
         importFrom("BuildXL.Utilities").Storage.dll,
-        importFrom("BuildXL.Utilities").Collections.dll,
         importFrom("BuildXL.Utilities").Utilities.Core.dll,
         importFrom("BuildXL.Tools").ServicePipDaemon.dll,
         importFrom("ItemStore.Shared").pkg,

Public/Src/Tools/Tool.MsBuildGraphBuilder/Tool.MsBuildGraphBuilder.dsc

@@ -21,7 +21,6 @@ namespace MsBuildGraphBuilder {
             importFrom("Newtonsoft.Json").pkg,
             importFrom("BuildXL.FrontEnd").MsBuild.Serialization.dll,
             importFrom("BuildXL.Utilities").dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Utilities").Utilities.Core.dll,
             importFrom("BuildXL.Utilities").Native.dll,
             ...addIf(BuildXLSdk.isFullFramework, importFrom("System.Collections.Immutable.ForVBCS").pkg),

Public/Src/Tools/UnitTests/Analyzers/Test.Tool.Analyzers.dsc

@@ -31,7 +31,6 @@ namespace Test.Tool.Analyzers {
             importFrom("BuildXL.Pips").dll,
             importFrom("BuildXL.Tools").Execution.Analyzer.exe,
             importFrom("BuildXL.Utilities").dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Utilities").Configuration.dll,
             importFrom("BuildXL.Utilities").Native.dll,
             importFrom("BuildXL.Utilities").Ipc.dll,

Public/Src/Tools/VBCSCompilerLogger/VBCSCompilerLogger.dsc

@@ -18,9 +18,8 @@ namespace VBCSCompilerLogger {
             importFrom("Microsoft.CodeAnalysis.VisualBasic.ForVBCS").pkg,
             importFrom("Microsoft.CodeAnalysis.Common.ForVBCS").pkg,
             importFrom("System.Collections.Immutable.ForVBCS").pkg,
-            importFrom("BuildXL.Utilities").dll,
+            importFrom("BuildXL.Utilities").Utilities.Core.dll,
             importFrom("BuildXL.Utilities").Native.dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Engine").Processes.dll,
             NetFx.Netstandard.dll, // due to issue https://github.com/dotnet/standard/issues/542
         ],
@@ -50,9 +49,8 @@ namespace VBCSCompilerLogger {
             importFrom("Microsoft.CodeAnalysis.Common.Old").pkg,
             importFrom("Microsoft.CodeAnalysis.VisualBasic.Old").pkg,
             importFrom("System.Collections.Immutable").pkg,
-            importFrom("BuildXL.Utilities").dll,
+            importFrom("BuildXL.Utilities").Utilities.Core.dll,
             importFrom("BuildXL.Utilities").Native.dll,
-            importFrom("BuildXL.Utilities").Collections.dll,
             importFrom("BuildXL.Engine").Processes.dll,
         ],
         runtimeContent:[