exist.hs:73:
My brain just exploded.
I can't handle pattern bindings for existentially-quantified
constructors.
It was my brain. (Though I discussed it with Mark, and I think
Hugs may have a similar restriction.)
data GenPic = forall pot. (PictureObject pot) = MkGenPic pot
main
Thanks Simon, though I'm still a tad at sea...
Of course you can! Take a look at the User Guide, section 2.12:
http://www.dcs.gla.ac.uk/fp/software/ghc/4.01/users_guide/user
s_guide-2.html
#ss2.12
(under "RTS options for hackers...")
That says it all, I have a nasty
Simon Peyton-Jones writes:
data GenPic = forall pot. (PictureObject pot) = MkGenPic pot
main :: IO ()
main = do
putStr $ getPictureName obj
where MkGenPic obj = item
item = head obj_list
The problem is the pattern binding for MkGenPic. Try
Hi,
I have a problem with the Eval class. Maybe its just that a compiler
flag or import declaration is missing. I compiled with
ghc-4.01/bin/ghc -c -fvia-C -syslib exts
and got the error message:
No instance for `Eval Int'
OK, let's try
instance Eval Int where
seq x y = y
Thanks Simon, though I'm still a tad at sea...
Of course you can! Take a look at the User Guide, section 2.12:
http://www.dcs.gla.ac.uk/fp/software/ghc/4.01/users_guide/users_guide-2.html
#ss2.12
(under "RTS options for hackers...")
That says it all, I have a nasty feeling... For a
Looks like the docs are a tad out of date, sorry about that. Patch follows
(you want ghc/rts/RtsFlags.h and ghc/includes/Rts.h respectively).
Ah-hah! So I should just be able to write, in rts.c:
#include "Rts.h"
void defaultsHook (void) {
RTSflags.GcFlags.stksSize = 102
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I can't speak for Hugs 1.3c, but Hugs 1.4 and prior systems use the
proposed monomorphism rule, not the Haskell 1.4 rule.
John
