It seems I wasn't subscribed to haskell-cafe so this reply didn't get through (sorry for sending this twice, Felipe). I've now subscribed with delivery turned off for -cafe so if you want me to read a response be sure to address me directly :) On Tue, Jan 4, 2011 at 5:08 AM, Ben Millwood wrote:

On Tue, Jan 4, 2011 at 4:02 AM, Felipe Almeida Lessa wrote:

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On Tue, Jan 4, 2011 at 1:49 AM, Ben Millwood wrote:

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haskell-src-meta is a package originally written by Matt Morrow to provide a translation from the syntax tree provided by haskell-src-exts to template haskell syntax. Essentially this allows TH code to be parsed from a string, and is used in several quasiquoter libraries.

Are the purposes of haskell-src-meta and haskell-src-exts-qq the same?  What are the main differences?

Cheers! =)

-- Felipe.

If you look at the source for Language.Haskell.Exts.Translate from haskell-src-exts-qq [1], you can see that it was actually taken from an earlier version of haskell-src-meta, presumably during the long period for which HSM was not maintained. I guess you could say that it inlined the key parts of haskell-src-meta into its codebase, but I hope that the maintainer can feel more confident about using the haskell-src-meta package as a dependency now.

My understanding of the *purpose* of haskell-src-exts-qq is that it is for easily generating ASTs for use with haskell-src-exts, whereas haskell-src-meta is for generating ASTs for use with template haskell.

[1] http://hackage.haskell.org/packages/archive/haskell-src-exts-qq/0.3.0/doc/ht...