"An implementation of the file or module '%s' has already been given"
coming from:
https://github.com/Microsoft/visualfsharp/blob/d2915e6ffa0d852cb3002199e66ef83bd2e8d1d0/src/fsharp/CompileOps.fs#L5221

File is not a module and perhaps the compiler should take into account the folder it is in.

Repro steps

Create a project and organize it using following folder structure:

/folder1/a.fs
/folder1/b.fs
/folder2/a.fs
/folder2/b.fs

This kind of organization is beneficial for modelling certain problems and having to maintain different file names is a burden.

Expected behavior

It should compile.

Actual behavior

Even if the modules/namespaces defined by these files are different the compilation will still fail with FS0239

Known workarounds

Rename the files.

Related information

• Operating system: n/a
• Branch: n/a
• .NET Runtime, CoreCLR or Mono Version: Mono 4.8 (.NET4.6)
• Editing Tools (e.g. Visual Studio Version): n/a
• Links to F# RFCs or entries on https://github.com/fsharp/fslang-suggestions: none
• Links to performance testing scripts: n/a
• Indications of severity: Minor