Don Syme

Failing tests: CodeGen\EmittedIL\Misc (AnonRecd.fs) -- failed CodeGen\EmittedIL\Tuples (OptionalArg01.fs - test optimizatons) -- failed

@brettfo This has some weird error now for BuildFromSource on Linux, any ideas? I've not seen this before ``` .../InitializeSourceControlInformation.targets(3,81): error MSB4022: The result "" of evaluating the value "$(_MicrosoftSourceLinkCommonAssemblyFile)"...

There's an annoying failure in the Windows source build. > D:\a\1\s\src\fsharp\fsi\fsi.fsproj : error MSB4057: The target "UpdateXlf" does not exist in the project. ##[error]src\fsharp\fsi\fsi.fsproj(0,0): error MSB4057: (NETCORE_ENGINEERING_TELEMETRY=Build) The target "UpdateXlf"...

This PR has two failures CodeGen\EmittedIL\LiteralValue -- failed CodeGen\EmittedIL\Mutation -- failed but I can't debug them. When I run these unit tests from the IDE they don't fail

> @dsyme I saw a similar failure in another merge, and from looking at it, those directories aren't on disk, so they may just need to be removed from a...

@KevinRansom I assume you want this targeted at `release/fsharp5`?

Heisenerror during testing ``` X Automation.EnumDUInterfacefromFSBrowse.InsideMatch [210ms] Error Message: System.IO.IOException : The process cannot access the file 'C:\Users\VssAdministrator\AppData\Local\Temp\2e1002c3-895b-45e2-a4da-075b4c929043\testFile.fs' because it is being used by another process. Stack Trace: at System.IO.__Error.WinIOError(Int32...

Three remaining failures: fsharpqa: 2020-10-26T22:24:26.3260107Z Diagnostics\General (E_Quotation_UnresolvedGenericConstruct01.fs) -- failed fsharp: ``` 2020-10-26T23:03:01.7500148Z X type check neg37 [1s 485ms] 2020-10-26T23:03:01.7502823Z Error Message: 2020-10-26T23:03:01.7509023Z System.Exception : neg37.err neg37.bsl differ; "diff between [D:\a\1\s\tests\fsharp\typecheck\sigs\neg37.bsl]...

Very happy to see this is now green again (which gives us opportunity to to iterate on it, instead of just maintaining it)

On integrating main there's a test failure in `Test ProjectForWitnesses4 GetWitnessPassingInfo` I'll disable the test in this branch and add it to the list of things in the PR description