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This provides a compatibility shim around the wherefrom function allowing a stable interface to be used for more versions of GHC.
In particular it should insulate users of the library from future breaking changes.
A nice upside is that it allows using
whereFrom
when it was first introduced rather than when it moved toGHC.InfoProv
.I've added a cabal flag, so the solver can still pick versions of
base
beforewhereFrom
existed