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Herbert Valerio Riedel authored
This is an attempt to address https://github.com/haskell/cabal/issues/1811 by replicating the less than 100 lines of code actually used from the containers package into an internal non-exposed `template-haskell` module. Moreover, `template-haskell` does not expose the `Map` type, so this change should have no visible effect on the public API. It may turn out that `Data.Map` is not necessary and that even a simple list-based associative list (`Prelude.lookup`) may suffice. However, in order to avoid any regressions, this commit takes the safe route and just clones `Data.Map` for now. Signed-off-by: Herbert Valerio Riedel <hvr@gnu.org>
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