On 2008 Sep 28, at 4:47, Andrew Coppin wrote:
By the way... I've seen a lot of type-level programs that allow you to express (and therefore verify) some pretty extreme properties of your code. In other words, you can make the compiler do more checking than it normally would. But the actual compiled code (assuming it does indeed compile) works exactly the same way as before. Is there any way to use type-level programming to actually alter the behaviour of the program in a useful/interesting way?
Aren't phantom types an example of this? Absent the phantoms the program would (if it worked at all) treat expressions the same that it treats differently with them. -- brandon s. allbery [solaris,freebsd,perl,pugs,haskell] allbery@kf8nh.com system administrator [openafs,heimdal,too many hats] allbery@ece.cmu.edu electrical and computer engineering, carnegie mellon university KF8NH