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Simon Peyton Jones authored
--------------------------------------- Record dependency on Template Haskell package --------------------------------------- An unforseen consequence of making the Template Haskell package separate is that we need to record dependency on the package, even if no TH module is imported. So we carry round (another) mutable variable tcg_th_used in the tyepchecker monad, and zap it when $(...) and [| ... |] are used. I did a little tidy-up and documentation in ListSetOps too
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