Template Haskell should allow reification of modules

[igloo]

It should be possible to reify a module from a splice. If the module is thisModule then it would only tell you about things above the current splice.

This comes up quite often; for example:

In  http://www.haskell.org/pipermail/haskell-cafe/2007-June/027205.html Brent Yorgey wants to get a list of top-level functions names prop_* in order to build a runQuickCheckProps function.

In  http://www.haskell.org/pipermail/haskell-cafe/2007-June/026493.html Neil Mitchell wants to get all the data/newtype declarations in a module in order to declare Typeable and Data instances for them.

[igloo]

#1444 is also somewhat related.

[ezyang]

Another use-case: creating libraries like lifted-base programmatically.

[liyang]

+1 what ezyang said.

[ddfisher]

I'm working on writing a low-boilerplate FFI from Python to Haskell and would find this very useful as well.