George Russell ([EMAIL PROTECTED]) wrote:
: Marc van Dongen wrote:
: > Wouldn't that make Enum depend on Ord?
: > Doesn't seem to make sense if classes are
: > enumerable but not comparable.
Of course above I should have said orderable in stead of comparable.
: What examples are there of types
Sadly my shiny new GHC (downloaded and compiled from CVS last night) seems to
have produced an inconsistent .hi file (attached) when compiling the basis.
The problem is that badHead is mentioned in a inline bit of gunk, but
the type for it isn't specified anywhere. (It's an internal value which
d
Marc van Dongen wrote:
> Wouldn't that make Enum depend on Ord?
> Doesn't seem to make sense if classes are
> enumerable but not comparable.
What examples are there of types for which it would be sensible to implement
Enum but not Ord? The concept rather puzzles me. In particular, suppose you
do
George Russell ([EMAIL PROTECTED]) wrote:
: A logical definition of Enum (to me wearing a mathematical hat)
: would be
:
: succ x = min { y | y > x}
:
Wouldn't that make Enum depend on Ord?
Doesn't seem to make sense if classes are
enumerable but not comparable.
Regards,
Marc
A logical definition of Enum (to me wearing a mathematical hat)
would be
succ x = min { y | y > x}
For Ratio this makes no sense, ergo Ratio should not be an
instance of Enum. For Float and Doubles it makes a lot of
sense (giving nextAfter, which is a commonly used IEEE function not
otherwise
Malcolm Wallace wrote:
> I'd say that this is a bug in the Library Report, which seems to
> specify this implementation. [...]
But for Float, Double, Ratio and friends the report explicitly
states that numericEnumFromFooBar has to be used, which generates
the finite list. So it's only a bug in al
Sven writes:
> Both GHC and Hugs have a bug in their Prelude for Ratio's Enum
> instance. ... The reason for this
> is that the default method for enumFromThenTo is used, which truncates
> 4%3 to 1 (same for enumFromTo).
I'd say that this is a bug in the Library Rep
Yes, this is a known bug. It doesn't happen in my private
copy, which I'm eternally just about to commit. I keep not
doing it because I'm busy doing ICFP papers.
I think I'll just commit it anyway by the end of this week.
Simon
| -Original Message-
| From: George Russell [mailto:[EMAI
George Russell wrote:
>
> Glasgow Haskell seems to be good at doing the impossible . . .
>
> panic! (the `impossible' happened):
> mkWWcpr: not a product
> w{-rIZ-}
> -> e{-rJ1-}
> -> Listener.DispatchMode{-rgO,i-}
> -> ExternalEvent.IA{-rgh,i-} GUIEvent.EventInfo{-rsx,i
Glasgow Haskell seems to be good at doing the impossible . . .
panic! (the `impossible' happened):
mkWWcpr: not a product
w{-rIZ-}
-> e{-rJ1-}
-> Listener.DispatchMode{-rgO,i-}
-> ExternalEvent.IA{-rgh,i-} GUIEvent.EventInfo{-rsx,i-}
Let me know if you want the source fi
> (when doing gmake in the fptools directory.)
> ../../../ghc/driver/ghc-inplace -o DtdToHaskell -cpp
> -fglasgow-exts -syslib text-H40m -OnotDtdToHaskell.o
> DtdToTypeDefPP.o
> /usr/local/pub-bkb/ghc/fptools/hslibs/data/libHSdata.a(FiniteM
> ap__1.o)(.text+0x38): undefined reference t
> 2.95.1
>
> With -O -O2-for-C it still crashes. With -O it does not.
> With -O2-for-C it does not.
>
> (gdb) bt
> #0 0x804932a in Main_zn_fast2 ()
> #1 0x500c0444 in ?? ()
> #2 0x500c1fa4 in ?? ()
> #3 0x468bfc45 in ?? ()
> Cannot access memory at address 0x8908468b.
We could investigate f
Hallo.
This seems very related to the bug I reported ago.
ghc -fno-prune-tydecls -O2 -fallow-undecidable-instances \
-fglasgow-exts -fallow-overlapping-instances -c -o Arglib.o Arglib.hs
panic! (the `impossible' happened):
mkWWcpr: not a product
forall tzq{-rme-}.
Arglib.ArgrF{
Both GHC and Hugs have a bug in their Prelude for Ratio's Enum
instance. The following program
import Ratio
main = print [ 1, 4%(3::Int) .. 2 ]
should print
[1 % 1,4 % 3,5 % 3,2 % 1]
but instead an infinite list of 1%1s is generated. The reason for this
is that the default method for
Marcin 'Qrczak' Kowalczyk ([EMAIL PROTECTED]) wrote:
: Thu, 9 Mar 2000 01:58:02 -0800, Simon Marlow <[EMAIL PROTECTED]> pisze:
:
: > So the likely candidate would appear to be your gcc - which version
: > do you have installed?
:
: 2.95.1
:
: With -O -O2-for-C it still crashes. With -O it does
(when doing gmake in the fptools directory.)
../../../ghc/driver/ghc-inplace -o DtdToHaskell -cpp -fglasgow-exts -syslib text
-H40m -OnotDtdToHaskell.o DtdToTypeDefPP.o
/usr/local/pub-bkb/ghc/fptools/hslibs/data/libHSdata.a(FiniteMap__1.o)(.text+0x38):
undefined reference to `__init_GlaE
Thu, 9 Mar 2000 01:58:02 -0800, Simon Marlow <[EMAIL PROTECTED]> pisze:
> So the likely candidate would appear to be your gcc - which version
> do you have installed?
2.95.1
With -O -O2-for-C it still crashes. With -O it does not.
With -O2-for-C it does not.
(gdb) bt
#0 0x804932a in Main_zn_f
> The following code crashes when compiled with -O2. With -O it does
> not crash. Some trivial modifications make the crash go away.
Sorry, I can't repeat this one. As far as I can tell, using -O2 does three
things
- it forces -fvia-C (on by default anyway)
- it passes -O2 to g
> GHC's lexer (function Lex.mk_var_token) treats names starting with
> an underscore followed by an uppercase letter as a constructor (conid)
> and not as a variable (varid):
>
>module Foo where
>data T = _ThisWorksAlthoughItShouldNot
>_ThisShouldWorkButItDoesNot = '?'
>
> A comment
The following code crashes when compiled with -O2. With -O it does
not crash. Some trivial modifications make the crash go away.
import Array(Array, array, (!))
import Random (StdGen, newStdGen)
import MonadRWS (RWS(..
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