[Haskell-cafe] Force evaluation

Hi, is there a way to force the "full" evaluation of a value (unless seq, which only brings the term to WHNF)? In my case, I have an algebraic data type Foo, and I would like to catch the exceptions that will occur during the evaluation of a value of Foo, for something like: foo <- force makeFoo `catch` \e -> defaultFoo Thanks, Michael PS: Ooops, posted this to haskell-ml first.