[Haskell-cafe] Hierarchical tracing for debugging laziness

[Claus Reinke]

> Look how one can watch the evaluation tree of a computation, to debug
> laziness-related problems.

You might like the old Hood/GHood:

http://hackage.haskell.org/package/hood
http://hackage.haskell.org/package/GHood

Background info/papers:

http://www.ittc.ku.edu/csdl/fpg/Tools/Hood
http://www.ittc.ku.edu/csdl/fpg/node/26
http://community.haskell.org/~claus/GHood/

Claus