This is related to a feature in the futhark compiler
<https://github.com/diku-dk/futhark/issues/550>, which is a language
with a similar module system.
I am trying to create a tool to detect unused top-level functions in
Futhark, and I have been looking in the ghc codebase to find out how it
does so. So far I have found these areas:
1. warning flag
<https://gitlab.haskell.org/ghc/ghc/-/blob/master/compiler/GHC/Driver/Flags.hs#L556-557>
2. WarnUnusedTopBinds
<https://gitlab.haskell.org/ghc/ghc/-/blob/master/compiler/GHC/Rename/Utils.hs#L355>
The project is a bit too big for my machine to take, so HLS is not
helping me with finding where the computation of unused bindings
(specifically functions) is done.
I would like some help with finding where ghc does this computation, and
maybe some help with the naming conventions of the code.
Thanks in advance.
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