Where else do I need to register fixity declarations?

[Sylvain Henry]

 > What am I doing wrong? Is filling the `mi_fixities` field of the 
`ModIface` not enough to let importers see the correct fixities?

It seems like the renamer is looking for the fixities via `mi_fix_fn 
(mi_final_exts iface)`, not `mi_fixities`.

You should try to replace:

   , mi_final_exts = mi_final_exts empty

with:

   , mi_final_exts = (mi_final_exts empty){ mi_fix_fn = mkIfaceFixCache 
(mi_fixities partial)


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