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Herbert Valerio Riedel authored
Supporting GHC 7.2 again was just a single `#ifdef`. Otoh, supporting GHC 7.0 would require reverting part of d10b168a . This also updates the build-dependancy version constraints to reflect the current reality. The code is `-Wall` clean for GHC 7.4 and later. Signed-off-by: Herbert Valerio Riedel <hvr@gnu.org>
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