Couldnt send this with the form on
http://haskell.systemsz.cs.yale.edu/hugs/bug-reports.html
for some reason.
Tried to create an ADT by not exporting the value
constructors from the module. If the constructor has
the same name as the type it is always available
even if not explicitly exported as
module Queue(Queue(Queue), ....) where
The defiition of q2 in UseQ should fail
q2 = Queue [1,2,3]
And can be made to if the Queue module is changed to
module Queue(Queue, ...) where
data Queue a = Qu [a]
and UseQ changed to
module UseQ where
import Queue
q = enter 123 ( enter 345 ( enter 567 empty ))
q2 = Qu [1,2,3]
Mark
--
Mark Skipper [EMAIL PROTECTED] | A fool's brain digests philosophy
Dpt. Of Computer Science | into folly, science into superstition,
De Montfort University. | and art into pedantry.
The Gateway, Leicester LE1 9BH | Hence University education.
http://www.cms.dmu.ac.uk/~mcs/ | -- George Bernard Shaw
useq.hs
queue.hs
