Three patches for cabal

Duncan Coutts duncan.coutts at
Wed Jun 3 19:38:03 EDT 2009

On Wed, 2009-06-03 at 16:33 +0100, Max Bolingbroke wrote:
> 2009/6/3 Niklas Broberg <niklas.broberg at>:
> > First there's the constructor called TransformListComp, which should
> > really be named GeneralizedListComp, since the constructor should
> > describe the extension and not the implementation scheme.
> It's called TransformListComp because the "then f" syntax transforms a
> list using f (which has type [a] -> [a]) - not because the
> implementation works by transformation or anything like that! We
> considered but rejected GeneralizedListComp because it's too vague -
> what if someone comes up with another list comprehension
> generalisation in the future?

In that case can the documentation, eg in the ghc user guide[1] be
updated to use the new name. It's jolly confusing to go looking for the
extension name corresponding to the extension. The ghc user guide
section on it calls it generalised and mentions no flag or extension
name. We initially thought that the extension had never been registered
and I only found it by accident when looking in the reference section of
the ghc user guide on flag names[2] I noticed that "transform list
comprehensions" actually links to the section on generalise list



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