duplicate fs file add to tempfiles

[ingted]

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Description

when codeStrings has not only one string in it provider.CompileAssemblyFromSource(params', codeStrings) would throw exception at CodeProvide.fs

around line 113 when AddExtension("fs", false)

Repro steps

Expected behavior

different .fs file name should be generated and add to tempfiles

Actual behavior

the second Array.map would call AddExtension("fs", false) but with the same file name

Known workarounds

I use guid string file name with AddFile to replace AddExtension

            sources |> Array.map (fun src ->
                let fn = Guid.NewGuid().ToString() + ".fs"
                res.TempFiles.AddFile(fn, false)
                use wr = new StreamWriter(fn)
                wr.Write(src)
                fn)

Related information

• Operating system Win 2012R2
• Branch master
• .NET Runtime 4.6.1