Organize files under src/fsharp

.gitignore

@@ -11,28 +11,21 @@ BenchmarkDotNet.Artifacts/
 # (These aren't generally useful to commit directly; if anything, they should be applied.)
 scripts/*.patch
 /src/*.userprefs
-/src/fsharp/FSStrings.resources
-/src/fsharp/FSharp.Build/*.resx
-/src/fsharp/fsi/*.resx
-/src/fsharp/FSharp.Compiler.Interactive.Settings/*.resx
-/src/fsharp/FSharp.Compiler.Server.Shared/*.resx
-/src/fsharp/fsi/Fsi.sln
-/src/fsharp/FSharp.Build/*.resources
-/src/fsharp/FSharp.Compiler.Service/*.resx
-/src/fsharp/FSharp.Compiler.Service/*.resources
-/src/fsharp/FSharp.Compiler.Service/*.sln
-/src/fsharp/FSharp.Compiler.Service/*.userprefs
-/src/fsharp/FSharp.Compiler.Service/StandardOutput.txt
-/src/fsharp/FSharp.Compiler.Service/StandardError.txt
+/src/Compiler/FSStrings.resources
+/src/FSharp.Build/*.resx
+/src/fsi/*.resx
+/src/FSharp.Compiler.Interactive.Settings/*.resx
+/src/FSharp.Compiler.Server.Shared/*.resx
+/src/fsi/Fsi.sln
+/src/FSharp.Build/*.resources
+/src/Compiler/*.resx
+/src/Compiler/*.resources
+/src/Compiler/*.sln
+/src/Compiler/*.userprefs
+/src/Compiler/StandardOutput.txt
+/src/Compiler/StandardError.txt
 /src/*.log
-/src/fsharp/FSharp.LanguageService.Compiler/illex.*
-/src/fsharp/FSharp.LanguageService.Compiler/ilpars.*
-/src/fsharp/FSharp.LanguageService.Compiler/lex.*
-/src/fsharp/FSharp.LanguageService.Compiler/pars.*
-/src/fsharp/FSharp.LanguageService.Compiler/pplex.fs
-/src/fsharp/FSharp.LanguageService.Compiler/pppars.fs
-/src/fsharp/FSharp.LanguageService.Compiler/pppars.fsi
-/src/fsharp/*/Properties/launchSettings.json
+/src/*/Properties/launchSettings.json
 /vsintegration/src/unittests/Unittests.fsi
 /tests/*FSharp_Failures.env
 /tests/*FSharp_Failures.lst

.vscode/launch.json

@@ -18,7 +18,7 @@
             // "preLaunchTask": "Build (Debug)",
             // If you have changed target frameworks, make sure to update the program path.
             "program": "${workspaceFolder}/artifacts/bin/fsi/Debug/net5.0/fsi.dll",
-            "cwd": "${workspaceFolder}/src/fsharp",
+            "cwd": "${workspaceFolder}/src",
             "console": "integratedTerminal",
             "stopAtEntry": false,
             "justMyCode": false,

DEVGUIDE.md

@@ -2,6 +2,10 @@
 
 This document details more advanced options for developing in this codebase. It is not quite necessary to follow it, but it is likely that you'll find something you'll need from here.
 
+## Documentation
+
+The compiler is documented in [docs](docs/index.md). This is essential reading.
+
 ## Recommended workflow
 
 We recommend the following overall workflow when developing for this repository:
@@ -122,9 +126,7 @@ Running any of the above will build the latest changes and run tests against the
 If your changes involve modifying the list of language keywords in any way, (e.g. when implementing a new keyword), the XLF localization files need to be synced with the corresponding resx files. This can be done automatically by running
 
 ```shell
-pushd src\fsharp\FSharp.Compiler.Service
-msbuild FSharp.Compiler.Service.fsproj /t:UpdateXlf
-popd
+dotnet build src\Compiler /t:UpdateXlf
 ```
 
 This only works on Windows/.NETStandard framework, so changing this from any other platform requires editing and syncing all of the XLF files manually.
@@ -152,13 +154,13 @@ export TEST_UPDATE_BSL=1
 Some of the code in this repository is formatted automatically by [Fantomas](https://github.com/fsprojects/fantomas). To format all files use:
 
 ```cmd
-dotnet fantomas src/fsharp -r
+dotnet fantomas src -r
 ```
 
 The formatting is checked automatically by CI:
 
 ```cmd
-dotnet fantomas src/fsharp -r --check
+dotnet fantomas src -r --check
 ```
 
 At the time of writing only a subset of signature files (`*.fsi`) are formatted. See the settings in `.fantomasignore` and `.editorconfig`.
@@ -239,6 +241,7 @@ Existing compiler benchmarks can be found in `tests\benchmarks\`.
 ### Example benchmark setup using [BenchmarkDotNet](https://github.com/dotnet/BenchmarkDotNet)
 
 1. Perform a clean build of the compiler and FCS from source (as described in this document, build can be done with `-noVisualStudio` in case if FCS/FSharp.Core is being benchmarked/profiled).
+
 2. Create a benchmark project (in this example, the project will be created in `tests\benchmarks\`).
 
       ```shell
@@ -251,13 +254,13 @@ Existing compiler benchmarks can be found in `tests\benchmarks\`.
     ```shell
     cd FcsBench
     dotnet add package BenchmarkDotNet
-    dotnet add reference ..\..\..\src\fsharp\FSharp.Compiler.Service\FSharp.Compiler.Service.fsproj
+    dotnet add reference ..\..\..\src\Compiler\FSharp.Compiler.Service.fsproj
     ```
 
 4. Additionally, if you want to test changes to the FSharp.Core
 
      ```shell
-     dotnet add reference ..\..\..\src\fsharp\FSharp.Core\FSharp.Core.fsproj
+     dotnet add reference ..\..\..\src\FSharp.Core\FSharp.Core.fsproj
      ```
 
     > as well as the following property have to be added to `FcsBench.fsproj`:
@@ -304,7 +307,7 @@ Existing compiler benchmarks can be found in `tests\benchmarks\`.
 
               match sourceOpt with
               | None ->
-                  sourceOpt <- Some <| SourceText.ofString(File.ReadAllText("""C:\Users\vlza\code\fsharp\src\fsharp\CheckExpressions.fs"""))
+                  sourceOpt <- Some <| SourceText.ofString(File.ReadAllText("""C:\Users\vlza\code\fsharp\src\Compiler\Checking\CheckExpressions.fs"""))
               | _ -> ()
 
 

FSharp.sln

@@ -3,21 +3,21 @@ Microsoft Visual Studio Solution File, Format Version 12.00
 # Visual Studio Version 17
 VisualStudioVersion = 17.1.32113.165
 MinimumVisualStudioVersion = 10.0.40219.1
-Project("{6EC3EE1D-3C4E-46DD-8F32-0CC8E7565705}") = "FSharp.Compiler.Server.Shared", "src\fsharp\FSharp.Compiler.Server.Shared\FSharp.Compiler.Server.Shared.fsproj", "{D5870CF0-ED51-4CBC-B3D7-6F56DA84AC06}"
+Project("{6EC3EE1D-3C4E-46DD-8F32-0CC8E7565705}") = "FSharp.Compiler.Server.Shared", "src\FSharp.Compiler.Server.Shared\FSharp.Compiler.Server.Shared.fsproj", "{D5870CF0-ED51-4CBC-B3D7-6F56DA84AC06}"
 EndProject
-Project("{6EC3EE1D-3C4E-46DD-8F32-0CC8E7565705}") = "FSharp.Core", "src\fsharp\FSharp.Core\FSharp.Core.fsproj", "{DED3BBD7-53F4-428A-8C9F-27968E768605}"
+Project("{6EC3EE1D-3C4E-46DD-8F32-0CC8E7565705}") = "FSharp.Core", "src\FSharp.Core\FSharp.Core.fsproj", "{DED3BBD7-53F4-428A-8C9F-27968E768605}"
 EndProject
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Tests", "Tests", "{CFE3259A-2D30-4EB0-80D5-E8B5F3D01449}"
 EndProject
-Project("{6EC3EE1D-3C4E-46DD-8F32-0CC8E7565705}") = "FSharp.Build", "src\fsharp\FSharp.Build\FSharp.Build.fsproj", "{702A7979-BCF9-4C41-853E-3ADFC9897890}"
+Project("{6EC3EE1D-3C4E-46DD-8F32-0CC8E7565705}") = "FSharp.Build", "src\FSharp.Build\FSharp.Build.fsproj", "{702A7979-BCF9-4C41-853E-3ADFC9897890}"
 EndProject
-Project("{6EC3EE1D-3C4E-46DD-8F32-0CC8E7565705}") = "fsc", "src\fsharp\fsc\fsc.fsproj", "{C94C257C-3C0A-4858-B5D8-D746498D1F08}"
+Project("{6EC3EE1D-3C4E-46DD-8F32-0CC8E7565705}") = "fsc", "src\fsc\fsc.fsproj", "{C94C257C-3C0A-4858-B5D8-D746498D1F08}"
 EndProject
-Project("{6EC3EE1D-3C4E-46DD-8F32-0CC8E7565705}") = "FSharp.Compiler.Interactive.Settings", "src\fsharp\FSharp.Compiler.Interactive.Settings\FSharp.Compiler.Interactive.Settings.fsproj", "{649FA588-F02E-457C-9FCF-87E46407481E}"
+Project("{6EC3EE1D-3C4E-46DD-8F32-0CC8E7565705}") = "FSharp.Compiler.Interactive.Settings", "src\FSharp.Compiler.Interactive.Settings\FSharp.Compiler.Interactive.Settings.fsproj", "{649FA588-F02E-457C-9FCF-87E46407481E}"
 EndProject
-Project("{6EC3EE1D-3C4E-46DD-8F32-0CC8E7565705}") = "fsi", "src\fsharp\fsi\fsi.fsproj", "{D0E98C0D-490B-4C61-9329-0862F6E87645}"
+Project("{6EC3EE1D-3C4E-46DD-8F32-0CC8E7565705}") = "fsi", "src\fsi\fsi.fsproj", "{D0E98C0D-490B-4C61-9329-0862F6E87645}"
 EndProject
-Project("{6EC3EE1D-3C4E-46DD-8F32-0CC8E7565705}") = "fsiAnyCpu", "src\fsharp\fsiAnyCpu\fsiAnyCpu.fsproj", "{8B3E283D-B5FE-4055-9D80-7E3A32F3967B}"
+Project("{6EC3EE1D-3C4E-46DD-8F32-0CC8E7565705}") = "fsiAnyCpu", "src\fsiAnyCpu\fsiAnyCpu.fsproj", "{8B3E283D-B5FE-4055-9D80-7E3A32F3967B}"
 	ProjectSection(ProjectDependencies) = postProject
 		{649FA588-F02E-457C-9FCF-87E46407481E} = {649FA588-F02E-457C-9FCF-87E46407481E}
 	EndProjectSection
@@ -43,15 +43,15 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Libraries", "Libraries", "{
 EndProject
 Project("{6EC3EE1D-3C4E-46DD-8F32-0CC8E7565705}") = "FSharp.Build.UnitTests", "tests\FSharp.Build.UnitTests\FSharp.Build.UnitTests.fsproj", "{53C0DAAD-158C-4658-8EC7-D7341530239F}"
 EndProject
-Project("{6EC3EE1D-3C4E-46DD-8F32-0CC8E7565705}") = "FSharp.DependencyManager.Nuget", "src\fsharp\FSharp.DependencyManager.Nuget\FSharp.DependencyManager.Nuget.fsproj", "{8B7BF62E-7D8C-4928-BE40-4E392A9EE851}"
+Project("{6EC3EE1D-3C4E-46DD-8F32-0CC8E7565705}") = "FSharp.DependencyManager.Nuget", "src\FSharp.DependencyManager.Nuget\FSharp.DependencyManager.Nuget.fsproj", "{8B7BF62E-7D8C-4928-BE40-4E392A9EE851}"
 EndProject
 Project("{6EC3EE1D-3C4E-46DD-8F32-0CC8E7565705}") = "FSharp.Compiler.Private.Scripting.UnitTests", "tests\FSharp.Compiler.Private.Scripting.UnitTests\FSharp.Compiler.Private.Scripting.UnitTests.fsproj", "{4FEDF286-0252-4EBC-9E75-879CCA3B85DC}"
 EndProject
 Project("{6EC3EE1D-3C4E-46DD-8F32-0CC8E7565705}") = "FSharp.Compiler.ComponentTests", "tests\FSharp.Compiler.ComponentTests\FSharp.Compiler.ComponentTests.fsproj", "{FAC5A3BF-C0D6-437A-868A-E962AA00B418}"
 EndProject
 Project("{6EC3EE1D-3C4E-46DD-8F32-0CC8E7565705}") = "FSharp.Compiler.Service.Tests", "tests\FSharp.Compiler.Service.Tests\FSharp.Compiler.Service.Tests.fsproj", "{DDFD06DC-D7F2-417F-9177-107764EEBCD8}"
 EndProject
-Project("{6EC3EE1D-3C4E-46DD-8F32-0CC8E7565705}") = "FSharp.Compiler.Service", "src\fsharp\FSharp.Compiler.Service\FSharp.Compiler.Service.fsproj", "{9B4CF83C-C215-4EA0-9F8B-B5A77090F634}"
+Project("{6EC3EE1D-3C4E-46DD-8F32-0CC8E7565705}") = "FSharp.Compiler.Service", "src\Compiler\FSharp.Compiler.Service.fsproj", "{9B4CF83C-C215-4EA0-9F8B-B5A77090F634}"
 EndProject
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Benchmarks", "Benchmarks", "{CE70D631-C5DC-417E-9CDA-B16097BEF1AC}"
 EndProject
@@ -80,7 +80,8 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Docs", "Docs", "{4E4F41D9-8
 		docs\memory-usage.md = docs\memory-usage.md
 		docs\optimizations.md = docs\optimizations.md
 		docs\overview.md = docs\overview.md
-		docs\public-fcs-api.md = docs\public-fcs-api.md
+		docs\fsi-emit.md = docs\fsi-emit.md
+		docs\debug-emit.md = docs\debug-emit.md
 	EndProjectSection
 EndProject
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "fcs", "fcs", "{B86EBFF1-E03E-4FAE-89BF-60A4CAE2BC78}"
@@ -100,7 +101,7 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "fcs", "fcs", "{B86EBFF1-E03
 		docs\fcs\untypedtree.fsx = docs\fcs\untypedtree.fsx
 	EndProjectSection
 EndProject
-Project("{6EC3EE1D-3C4E-46DD-8F32-0CC8E7565705}") = "fscAnyCpu", "src\fsharp\fscAnyCpu\fscAnyCpu.fsproj", "{8ACA60C2-7266-425A-B641-A2946396B7D1}"
+Project("{6EC3EE1D-3C4E-46DD-8F32-0CC8E7565705}") = "fscAnyCpu", "src\fscAnyCpu\fscAnyCpu.fsproj", "{8ACA60C2-7266-425A-B641-A2946396B7D1}"
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "PEVerify", "tests\PEVerify\PEVerify.csproj", "{358821CB-4D63-4157-9EFF-65C06EBD4E36}"
 EndProject

FSharpBuild.Directory.Build.props

@@ -49,7 +49,7 @@
     <StrongNameKeyId>Microsoft</StrongNameKeyId>
   </PropertyGroup>
   <PropertyGroup Condition="'$(MonoPackaging)' == 'true'">
-    <AssemblyOriginatorKeyFile>$(FSharpSourcesRoot)\fsharp\test.snk</AssemblyOriginatorKeyFile>
+    <AssemblyOriginatorKeyFile>$(FSharpSourcesRoot)\test.snk</AssemblyOriginatorKeyFile>
     <DelaySign>false</DelaySign>
     <DefineConstants>STRONG_NAME_FSHARP_COMPILER_WITH_TEST_KEY;$(DefineConstants)</DefineConstants>
   </PropertyGroup>

Microsoft.FSharp.Compiler.sln

@@ -3,7 +3,7 @@ Microsoft Visual Studio Solution File, Format Version 12.00
 # Visual Studio Version 17
 VisualStudioVersion = 17.1.32113.165
 MinimumVisualStudioVersion = 10.0.40219.1
-Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Microsoft.FSharp.Compiler", "src\fsharp\Microsoft.FSharp.Compiler\Microsoft.FSharp.Compiler.csproj", "{BBEDE3FA-6E2C-4C53-8B61-FBB545CD4FFC}"
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Microsoft.FSharp.Compiler", "src\Microsoft.FSharp.Compiler\Microsoft.FSharp.Compiler.csproj", "{BBEDE3FA-6E2C-4C53-8B61-FBB545CD4FFC}"
 EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution

README.md

@@ -34,13 +34,17 @@ After it's finished, open `FSharp.sln` in your editor of choice.
 
 ### Documentation for contributors
 
+* The [Compiler Documentation](docs/index.md) is essential reading for any larger contributions to the F# compiler codebase and contains links to learning videos, architecture diagrams and other resources.
+
+* The same docs are also published as the [The F# Compiler Guide](https://fsharp.github.io/fsharp-compiler-docs/). It also contains the public searchable docs for FSharp.Compiler.Service component.
+
 * See [DEVGUIDE.md](DEVGUIDE.md) for more details on configurations for building the codebase. In practice, you only really need to run `build.cmd`/`build.sh`.
 
 * See [TESTGUIDE.md](TESTGUIDE.md) for information about the various test suites in this codebase and how to run them individually.
 
-* [The F# Documentation](https://docs.microsoft.com/en-us/dotnet/fsharp/) is the primary documentation for F#. The source for the content is [here](https://github.com/dotnet/docs/tree/main/docs/fsharp).
+### Documentation for F# community
 
-* [The F# Compiler Guide](https://fsharp.github.io/fsharp-compiler-docs/) is essential reading for any larger contributions to the F# compiler codebase and contains links to learning videos, architecture diagrams and other resources. It also contains the public searchable docs for FSharp.Compiler.Service (or equivalent of Roslyn). The source for the content is [in this repo under `docs/`](docs/) and the site is built automatically by [this small repo](https://github.com/fsharp/fsharp-compiler-docs).
+* [The F# Documentation](https://docs.microsoft.com/dotnet/fsharp/) is the primary documentation for F#. The source for the content is [here](https://github.com/dotnet/docs/tree/main/docs/fsharp).
 
 * [The F# Language Design Process](https://github.com/fsharp/fslang-design/) is the fundamental design process for the language, from [suggestions](https://github.com/fsharp/fslang-suggestions) to completed RFCs.  There are also [tooling RFCs](https://github.com/fsharp/fslang-design/tree/main/tooling) for some topics where cross-community co-operation and visibility is most useful.
 

TESTGUIDE.md

@@ -14,31 +14,38 @@ Where this guide mentions the command `build` it means either `build.cmd` in the
 
 ## Quick start: Running Tests
 
-Tests are grouped as noted below. Some test groups can only be run in `CI` configuration, for that, you need to pass the `-ci -bl` or `-ci -nobl` arguments. Some test groups can only be run in Release mode, this is indicated below. Some tests can only be run on Windows.
-
-To run tests, from a command prompt, use variations such as the following, depending on which test suite and build configuration you want.
-
-### Tests runnable in any configuration
-
-The following testsets can be run in Release or Debug mode, with or without the `-ci` argument.
-
-Run the tests in Release mode:
+To run the tests in Release mode:
 
 ```shell
 build -testCompiler -c Release
+build -testCompilerService -c Release
+build -testCompilerComponentTests -c Release
+build -testCambridge -c Release -ci -nobl
+build -testFSharpQA -c Release -ci -nobl
 build -testFSharpCore -c Release
 build -testScripting -c Release
-build -testVS -c Release
+build -testVs -c Release
+build -testAll -c Release
 ```
 
-Run the tests in Debug mode, add `-c Debug` or leave it out:
+### Tests grouping summary
 
-```shell
-build -testCompiler -c Debug
-build -testFSharpCore -c Debug
-build -testScripting -c Debug
-build -testVS -c Debug
-```
+| Group name | OS | Description |
+|------------|----|-------------|
+| testDesktop  | Windows | Runs all net472 tests in 32 bit processes, this includes tests from other groups |
+| testCoreClr  | Linux/Mac/Windows | Runs all .NetStandard and .NETCore tests in 64 bit processes, this includes tests from other groups |
+| testFSharpCore | Windows | Runs all test for FSharp.Core.dll |
+| testCambridge | Windows | Runs the Cambridge suite tests |
+| testFSharpQA  | Windows | Runs the FSharpQA tests, requires Perl |
+| testVS        | Windows + VS | Runs all VS integration tests |
+| testCompiler  | Windows | Runs a few quick compiler tests |
+| testScripting | Windows | Runs scripting fsx and fsi commandline tests |
+| test          | Windows | Same as testDesktop |
+| testAll       | Windows | Runs all above tests |
+
+Some test groups can only be run in `CI` configuration, for that, you need to pass the `-ci -bl` or `-ci -nobl` arguments. Some test groups can only be run in Release mode, this is indicated below. Some tests can only be run on Windows.
+
+To run tests, from a command prompt, use variations such as the following, depending on which test suite and build configuration you want.
 
 ### Tests that can be run on Linux and MacOS
 
@@ -55,37 +62,13 @@ build -testDesktop -c Release
 build -testCoreClr -c Release
 ```
 
-### Tests that can only run with `-ci`
-
-The following tests **must** be run in Release mode and **must** have  the CI argument like `-ci -bl` or `-ci -nobl`:
-
-```shell
-build -testCambridge -c Release -ci -nobl
-build -testFSharpQA -c Release -ci -nobl
-```
-
 ### Tests that open other windows
 
 The following testsets open other windows and may interfere with you using your workstation, or change focus while you're doing something else:
 
 * FSharpQA
 * Cambridge
 
-### Tests grouping summary
-
-| Group name | OS | Description |
-|------------|----|-------------|
-| testDesktop  | Windows | Runs all net472 tests in 32 bit processes, this includes tests from other groups |
-| testCoreClr  | Linux/Mac/Windows | Runs all .NetStandard and .NETCore tests in 64 bit processes, this includes tests from other groups |
-| testFSharpCore | Windows | Runs all test for FSharp.Core.dll |
-| testCambridge | Windows | Runs the Cambridge suite tests |
-| testFSharpQA  | Windows | Runs the FSharpQA tests, requires Perl |
-| testVS        | Windows + VS | Runs all VS integration tests |
-| testCompiler  | Windows | Runs a few quick compiler tests |
-| testScripting | Windows | Runs scripting fsx and fsi commandline tests |
-| test          | Windows | Same as testDesktop |
-| testAll       | Windows | Runs all above tests |
-
 ### Running tests online in CI
 
 You can also submit pull requests to https://github.com/dotnet/fsharp and run the tests via continuous integration. Most people do wholesale testing that way. A few notes:
@@ -109,7 +92,7 @@ The prerequisites are the same as for building the `FSharp.sln`, plus, at a mini
   * Between switching git branches
   * When merging with latest `main` upstream branch.
 
-## Test Suites
+## More Details
 
 The F# tests are split as follows:
 
@@ -126,8 +109,6 @@ The F# tests are split as follows:
 * [VisualFSharp.UnitTests](vsintegration/tests/unittests) - Visual F# Tools IDE Unit Test Suite
   This suite exercises a wide range of behaviors in the F# Visual Studio project system and language service.
 
-## More Details
-
 ### FSharp Suite
 
 This is compiled using [tests\fsharp\FSharp.Tests.FSharpSuite.fsproj](tests/fsharp/FSharp.Tests.FSharpSuite.fsproj) to a unit test DLL which acts as a driver script. Each individual test is an NUnit test case, and so you can run it like any other NUnit test.
@@ -256,7 +237,6 @@ Some tests are known to fail on these older branches when run using one of the `
 
 * Adding the `-norestore` flag to the commandline speeds up the build part a little bit.
 * When using the `-ci` flag (mandatory for some testsets), adding the `-nobl` flag prevents creating the binary log files.
-* NGen-ing the F# bits (fsc, fsi, FSharp.Core, etc) will result in tests executing much faster. Make sure you run `src\update.cmd` with the `-ngen` flag before running tests.
 
 Some tests run in parallel by default, or use a hosted compiler to speed things up: