On Tue, Apr 17, 2012 at 02:41:15PM -0700, Tim Perry wrote: > seq evaluates to Weak Head Normal Form (WHNF). WHNF is the first > contructor. So your use of seq only evaluates the first number and the > cons. I.E., it evaluates to: > s:(Thunk) Actually, it doesn't even force the first number. You just get Thunk : Thunk -Brent