Am 09.04.2014 22:08, schrieb Erik Hesselink:

The only constraint that actually makes sense for template-haskell is
'installed', which I have in my cabal.config.

This is clever. Maybe Cabal can write this into a default cabal-config file?

This can then be combined with a
constraint on the known versions of TH a package works with.

A package could specify version bounds in
  Build-Depends: template-haskell

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