Speaking as a part time GHC contributor (and alleged "core haskeller"), theres A LOT of exciting work going on right now for improving debuggability wrt correct

Speaking as a part time GHC contributor (and alleged "core haskeller"), theres A LOT of exciting work going on right now for improving debuggability wrt correctness bugs and performance tuning. GHC 7.10 is slated to (hopefully have): 1. exceptions will come with stack traces! a. Some of this same work will also allow for sampling based based performance tools b. mind you, a lots still in flux 2. theres a non zero chance you'll have in langauge facilities to create threads that get killed automatically if they exceed certain programaticaly set CPU/Memory/other resource limits! 3. Other things which are a combination of hard work and clever research grade engineering I myself (as Tel knows) have plans for making GHC haskell AMAZING for numerical computing, and my wee ways of contributing to GHC are guided by that goal