I've heard Simon (Peyton-Jones) twice now mention the desire to be able to embed a monadic subexpression into a monad. That would be http://article.gmane.org/gmane.comp.lang.haskell.prime/2267 and in the recent OSCON video. Is someone working on implementing this? If no, I'll take a crack at it. If yes, I'd be slower than someone else, since I'm new to GHC. This seems like something a tad easier than type system extensions and the like since it's just desugaring... but a little harder than my "remove the GHCi banner" patch! In other words, a perfect step for me. Also, I got so frustrated that I ended up abandoning some code recently because STM is, in the end, so darn hard to use as a result of this issue. I'd love to see this solved, and I'm quite eager to do it. Proposals for syntax I've seen include: $( expr ) -- conflicts with template haskell ( <- expr ) -- makes sense, and I think it's unambiguous Other ideas: ``expr`` -- back-ticks make sense for UNIX shell scripters (| expr |) -- I don't think anything uses this yet Thoughts? -- Chris Smith