Merge FlexibleContexts with FlexibleInstances?
In my limited experience thus far, it seems to me that a substantial majority of modules that start out needing one of these end up needing the other one too. They appear to be two sides of the same coin, each allowing for (slightly) more powerful termination checking. Should the two just be made synonyms, to cut down a tiny bit on the boilerplate LANGUAGE pragmas?
On 2015-02-06 at 07:05:35 +0100, David Feuer wrote:
In my limited experience thus far, it seems to me that a substantial majority of modules that start out needing one of these end up needing the other one too. They appear to be two sides of the same coin, each allowing for (slightly) more powerful termination checking. Should the two just be made synonyms, to cut down a tiny bit on the boilerplate LANGUAGE pragmas?
Otoh, FlexibleInstances is only needed if you define instances, while FlexibleContexts can also be required with code not defining any instances (and GHC 7.10 requires FlexibleContexts more often now for inferred type-signatures which couldn't be written w/o FlexibleContexts) Cheers, hvr
participants (2)
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David Feuer -
Herbert Valerio Riedel