Hello, On Saturday 06 January 2007 12:47, Neil Mitchell wrote:
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6. I get the message "Nothing derived for Id 424 at nopos" and similar messages with 424 replaced by other numbers when a number of modules are compiled. The modules seem to compile OK, however. What does this mean?
Never seen that before. Can you attach a module that gives this behaviour?
Here is one, very small so I refrain from attaching: module Id424 where f x = xd2 where (xd2,0) = x`divMod`2 This is what it looks like when I compile it: Thorkil-Naurs-Computer:~/tn/test/Yhc/Id424 thorkilnaur$ yhc Id424 Compiling Id424 ( Id424.hs ) Nothing derived for Id 207 at nopos Thorkil-Naurs-Computer:~/tn/test/Yhc/Id424 thorkilnaur$ Bytecode is produced.
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9. Finally, I get a message "Error: Identifier getArgs used at 67:15-67:21 is not defined." when using that function in a Main module:
args<-getArgs
Have you got import System.Environment? or import System? It's possible that one of them is lacking a reexport of getArgs. I've certainly used getArgs in a Yhc program before.
I had import System. Changing to import System.Environment removed the complaint. Thanks.
... This has been very helpful!
Very satisfying, thanks. Best regards Thorkil