error: duplicate entry '.cctor' in method table

Please provide a succinct description of the issue.

Repro steps
type U<'T> = | A static member val X = 3
Expected behavior

Per #18767, this should be fixed, however it still exists.

Actual behavior

Known workarounds

Still
``

type U<'T> =
| A of unit
static member val X = 3
;;
type U<'T> =
| A of unit
static member X: int

``

Related information

Provide any related information (optional):

Operating system
.NET Runtime kind (.NET Core, .NET Framework, Mono) .net 9.0.100 and after, 10.0.101
Editing Tools (e.g. Visual Studio Version, Visual Studio) dotnet fsi & (netfx) fsiAnyCpu.exe

I can see the fix was merged in late September, which was after net10.10x was branched off.
This fix shall be available with the 10.0.200 release and later releases.

With F#10 (SDK 10.0.201), it still not working.

root@gemini4_2:/workspace$ dotnet fsi

Microsoft (R) F# Interactive version 15.2.201.0 for F# 10.0
Copyright (c) Microsoft Corporation. All Rights Reserved.

For help type #help;;

> type U<'T> = | A static member val X = 3;;
Duplicate in method table is:
 Type index: 3
 Method name: .cctor
 Method arity (num generic params): 0


error FS0192: internal error: Error in pass2 for type FSI_0002, error: Error in pass2 for type U`1, error: duplicate entry '.cctor' in method table

>

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error: duplicate entry '.cctor' in method table #19187

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error: duplicate entry '.cctor' in method table #19187

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T-Gro commented on Jan 2, 2026

ingted commented on Mar 17, 2026

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