On Sun, Dec 20, 2009 at 4:12 PM, Brandon S. Allbery KF8NH
On Dec 20, 2009, at 17:09 , Jason Dusek wrote:
A quick check on Hayoo! and in my interpreter shows that there are basically no instances of `IsString`. Is it really so little used?
The only 2 instances I'm aware of are String and lazy and strict ByteStrings. It's not clear to me that there need to be any more (well, maybe the packed Unicode string package on hackage).
There's also ShowS and Text.PrettyPrint.Doc which make useful instances. The ShowS instance is a bit dicey since ShowS is just a type synonym. I don't know of any released packages which include these, though. I don't know if it would increase clarity, but I could see a Parsec instance as well, where fromString = string :: String -> Parser String. You could do the same for any of the parser combinator libraries I imagine. Antoine