Ian Lynagh
$ cat Q.hs module Q where import Data.Bits (shiftL)
$ nhc98 -c Q.hs ====== Errors when renaming: Identifier shiftL used at 4:19-4:24 is not defined.
If I change the second line to import Data.Bits (Bits(shiftL)) then it compiles fine. ghc and hugs are both happy with it either way. My reading of the report suggests the first form should be allowed (and hence this is a bug in nhc98):
It is a bug, and one I have been aware of for some time. The workaround is easy (just change the import line), so fixing it has not been a high priority.
By the way, these bugs are coming from looking at compiling darcs with nhc98, but there are also a number of modules/functions missing. Are you interested in a list of these?
Yes.
Control.Concurrent.MVar Control.Exception (catch, block, unblock, bracket_)
nhc98 at the moment does not implement concurrent threads, nor general exceptions. I have made a start on the former (using a similar cooperative scheduling model to that used in Embedded Gofer), but it will be some time before it is complete. If someone else were looking for a nice self-contained little implementation project, then either exceptions or threads would be very welcome, and I would happily pass on the baton.
System.IO (hPutBuf, hGetBuf)
Implementing binary I/O should be pretty straightforward in nhc98 - it doesn't perform any CR/LF translation anyway, so there is effectively no difference between text and binary modes. Adding these library functions in particular should come down to writing a few lines of C and a Haskell FFI wrapper. Regards, Malcolm