Crash Repro: .NET SDK 6 -- Tail Overflow

A minimal repro of an F# bad tailcall overflow introduced by .NET SDK 6

Repro Instructions (for Windows)

From the repo root on the command line, in order:

1. init.cmd
   • You only need to run this once to bootstrap Paket
2. build.cmd
3. dotnet fsi (or host fsi.exe in your terminal of choice)
4. #load "Repro.fsx";;
   • A stack overflow will tear down the fsi process

Does this code ever work?

Yes. To prove this is an upstream regression:

• In global.json, set sdk version to 5.0.404
• Follow the repro instructions above from step 2
• Everything is ok (no overflow)

Does this work in release mode?

Yes.

• In build.cmd, change -c Debug to -c Release
• Revert sdk version in global.json (if you changed it) to 6.0.101
• Follow the repro instructions above from step 2
• Everything is ok (no overflow)

Notes

• Built with VS Code on Windows 10
• Targets netstandard2.1

License

• This repo is MIT licensed
• Please note that src/Rng.fs contains an excerpt adapted from FsCheck:
  • https://github.com/fscheck/FsCheck/blob/master/src/FsCheck/Random.fs
  • https://github.com/fscheck/FsCheck/blob/master/License.txt (BSD 3-Clause)