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Weird compiler crash
websharpercompilerbug

The follow piece of code:

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type Foo() =
    static let hey = 43
    abstract member clone: unit -> Foo
    default __.clone() = new Foo()

crashes the websharper compiler with:

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FSC: error : Global error 'An item with the same key has already been added.' at
    at System.ThrowHelper.ThrowArgumentException(ExceptionResource resource)
	at System.Collections.Generic.Dictionary`2.Insert(TKey key, TValue value, Boolean add)
	at <StartupCode$WebSharper-Compiler>.$Compilation.resolveRemainingInstanceMembers@1268-1.Invoke(String n)
	at <StartupCode$WebSharper-Compiler>.$Compilation.resolveRemainingInstanceMembers@1212(Compilation this, FSharpTypeFunc printerrf, Resolver r, Dictionary`2 remainingInstanceMembers, HashSet`1 resolved, Hashed`1 typ, ClassInfo cls, FSharpList`1 ms
	at WebSharper.Compiler.Compilation.Resolve()
	at WebSharper.Compiler.FSharp.ProjectReader.transformAssembly(Compilation comp, String assemblyName, FSharpCheckProjectResults checkResults)
	at WebSharper.Compiler.FSharp.WebSharperFSharpCompiler.Compile(Task`1 prevMeta, String[] argv, String path, String assemblyName)
	at WebSharper.FSharp.Program.Compile$cont@94-1(WsConfig config, String thisName, WebSharperFSharpCompiler compiler, FSharpList`1 paths, AssemblyResolver aR, Unit unitVar)
	at WebSharper.FSharp.Program.Compile$cont@58(WsConfig config, WarnSettings warnSettings, String thisName, Unit unitVar)
	at WebSharper.FSharp.Program.compileMain$cont@209(String[] argv, Unit unitVar)
	at WebSharper.FSharp.Program.main(String[] argv)
.

Hello, thanks for the report! This indeed looks like a bug, static let and abstract both working on their own but mishandled when both are present.

(A workaround is to change the static let to a module let.)

By on 5/17/2018 6:11 AM ()

Hello, fix is now being released in version 4.2.14.264.

By on 6/15/2018 10:44 AM ()

I have created issue #951 for tracking this.

By on 5/17/2018 6:15 AM ()

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