Re: Exports of STM constructors.

Simon Peyton-Jones wrote:

Your suggestion seems plausible to me:

- export *everything* from GHC.Conc; import this only if you know what you are doing

- export STM, TVar only *abstractly* from Control.Concurrent.STM; this is the interface for ordinary users

This sounds like a candidate for the standard library modification process, if someone wants to put it into action.

http://haskell.org/haskellwiki/Library_submissions

I think GHC.Conc is private to GHC, not an official API, and therefore not subject to the library submission process. I'll go ahead make this change. Cheers, Simon