12 Sep
2007
12 Sep
'07
5:04 p.m.
Hi
The same should apply to head and tail. head or tail of [] should be [].
What does the list think?
Disagree, strongly. Its not even possible for head, since [a] -> a. Wadler's theorems for free states that if head is given an empty list the _only_ thing it can do is crash.
What's the logic behind this? Thanks, Paul