Skip to content

Fsc hangs when building Fscheck #20305

Description

@kurtschelfthout

Please provide a succinct description of the issue.

Whichever fsc version that ships with Visual Studio Community 2026 August Update 18.9.1 hangs when compiling FsCheck.

Provide the steps required to reproduce the problem:

  1. Clone https://github.com/Fscheck/fscheck/
  2. Open FsCheck.sln with Visual Studio Community 2026 August update.
  3. Build the solution

Alternatively:

  1. Clone https://github.com/Fscheck/fscheck/
  2. Run build.cmd -t CI

Expected behavior

Build finishes in reasonable time.

Actual behavior

The build never finishes. fscAnyCpu takes a single core, seemingly forever.

Known workarounds

Roll back Visual Studio 2026 to July Update 18.8.3.

Related information

Provide any related information (optional):

  • Operating system: Windows 11
  • .NET Runtime kind (.NET Core, .NET Framework, Mono): .NET 10, build targeting netstandard2.0
  • Editing Tools (e.g. Visual Studio Version, Visual Studio): Visual Studio 2026 August Update

Sorry I rolled back before I could capture the fsc version.

Metadata

Metadata

Assignees

No one assigned

    Labels

    Type

    Projects

    Status
    New

    Relationships

    None yet

    Development

    No branches or pull requests

    Issue actions