Duplicate nested module inside "module rec" gives odd error

[0x53A]

I "accidentally" compiled a Fable project in Visual Studio :)

1>------ Build started: Project: Client, Configuration: Debug Any CPU ------
1>FSC : error FS0193: The module/namespace 'Babylonjs.BABYLON.Debug.BoneAxesViewerStatic' from compilation unit 'Client' did not contain the module/namespace '<some module on this path>'
1>error FS0193 : internal error : Der angegebene Schlüssel war nicht im Wörterbuch angegeben.
1>error FS0193 : internal error : Der angegebene Schlüssel war nicht im Wörterbuch angegeben.

An unhandled exception of type 'System.Collections.Generic.KeyNotFoundException' occurred in FSharp.Compiler.Private.dll
Der angegebene Schlüssel war nicht im Wörterbuch angegeben.

>   FSharp.Compiler.Private.dll!Microsoft.FSharp.Compiler.ErrorLogger.ErrorLoggerExtensions.ErrorLogger.ErrorRecovery(Microsoft.FSharp.Compiler.ErrorLogger.ErrorLogger x, System.Exception exn, Microsoft.FSharp.Compiler.Range.range m)   Unknown No symbols loaded.
    fsc.exe!Microsoft.FSharp.Compiler.CommandLineMain.main(string[] argv)   Unknown No symbols loaded.

[forki]

Can you please upload a repro?

Lukas Rieger notifications@github.com schrieb am Mi., 8. Aug. 2018, 11:24:

I "accidentally" compiled a Fable project in Visual Studio :)

[image: grafik] https://user-images.githubusercontent.com/4236651/43828613-4eb8df82-9afd-11e8-9889-254f2443db35.png

1>------ Build started: Project: Client, Configuration: Debug Any CPU ------ 1>FSC : error FS0193: The module/namespace 'Babylonjs.BABYLON.Debug.BoneAxesViewerStatic' from compilation unit 'Client' did not contain the module/namespace '' 1>error FS0193 : internal error : Der angegebene Schlüssel war nicht im Wörterbuch angegeben. 1>error FS0193 : internal error : Der angegebene Schlüssel war nicht im Wörterbuch angegeben.

An unhandled exception of type 'System.Collections.Generic.KeyNotFoundException' occurred in FSharp.Compiler.Private.dll Der angegebene Schlüssel war nicht im Wörterbuch angegeben.

FSharp.Compiler.Private.dll!Microsoft.FSharp.Compiler.ErrorLogger.ErrorLoggerExtensions.ErrorLogger.ErrorRecovery(Microsoft.FSharp.Compiler.ErrorLogger.ErrorLogger x, System.Exception exn, Microsoft.FSharp.Compiler.Range.range m) Unknown No symbols loaded. fsc.exe!Microsoft.FSharp.Compiler.CommandLineMain.main(string[] argv) Unknown No symbols loaded.

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[0x53A]

not reduced repro is here: https://github.com/0x53A/fable-suave-scaffold/tree/babylon

I'll try to reduce it later, no time atm.

[0x53A]

single-file crash here: https://github.com/0x53A/FableBabylonCrash

[cartermp]

@0x53A I get the following in the reduced repro:

1>  C:\Users\phcart\AppData\Local\Temp\.NETStandard,Version=v2.0.AssemblyAttributes.fs
1>
1>  FSC : error FS0193: The module/namespace 'Babylonjs.BABYLON.Debug' from compilation unit 'FableBabylonCrash' did not contain the namespace, module or type 'BoneAxesViewerStatic'
1>Done building target "CoreCompile" in project "FableBabylonCrash.fsproj" -- FAILED.
1>
1>Done building project "FableBabylonCrash.fsproj" -- FAILED.
1>
1>Build FAILED.
1>
1>FSC : error FS0193: The module/namespace 'Babylonjs.BABYLON.Debug' from compilation unit 'FableBabylonCrash' did not contain the namespace, module or type 'BoneAxesViewerStatic'
1>    0 Warning(s)
1>    1 Error(s)
1>
1>Time Elapsed 00:00:06.76
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

[0x53A]

My crash was in 15.7.3, maybe it was fixed in 15.8.

I'm away from the computer for the week, will try again on Monday and reopen if it still repros.

Thanks!

[0x53A]

I couldn't yet update to VS 15.8 Release because my internet is shit, but I think this is still a bug.

1) (minor) I would like a line-number which points me to where BoneAxesViewerStatic is referenced. 2) The file does contain the class Babylonjs.BABYLON.Debug.BoneAxesViewerStatic.

[0x53A]

Ok I found the issue: there are multiple modules with the name Debug in Babylonjs.BABYLON.

So the code is incorrect, but the error is really unhelpful.

[0x53A]

Simplified repo:

namespace Babylonjs

module rec BABYLON =
    module Debug =
        let x = 1
    module Debug = 
        type [<AllowNullLiteral>] BoneAxesViewer = class end

        type [<AllowNullLiteral>] BoneAxesViewerStatic =
            abstract Create: float -> BoneAxesViewer

module Program =
    [<EntryPoint>]
    let main argv = 0

Expected:

error FS0037: Duplicate definition of type, exception or module 'Debug'

Actual:

1>FSC : error FS0193: The module/namespace 'Babylonjs.BABYLON.Debug.BoneAxesViewerStatic' from compilation unit 'ConsoleApp3' did not contain the module/namespace '<some module on this path>'
1>error FS0193 : internal error : The given key was not present in the dictionary.
1>error FS0193 : internal error : The given key was not present in the dictionary.

(apparently the internal error is fixed with 15.8, so ignore that)