I can point you to the line of code causing you trouble[1].
The problem is, as you already pointed out, that we don't have a
PersistValue constructor that fits this case correctly. I think the right
solution is to go ahead and add such a constructor for the next release.
I've opened a ticket on
Hi,
isn't the correct type context for f the following?
f :: (Functor m, Monad m) = Int - m a - m (Seq a)
So your f really is a kind of specialization of g.
Could the reason for f performing better be list fusion? Anything
happening inside Control.Monad.replicateM should be subject to it.
Hi,
I noticed a weird behaviour with cabal-install. When I run `cabal install
hspec --dry-run -v` cabal-install correctly picks hspec-1.4.3 (the latest
version).
However, when I run `cabal install ansi-terminal hspec --dry-run
-v`cabal-install tries to install hspec-0.3.0 for no apparent reason.
Yes, you're right about the type context. I always forget that Functor is
not a superclass of Monad. Anyway, the `fmap` can be done only with `Monad`
in the context.
About the list fusion, I'm compiling with optimizations enabled (-O2), but
I do not know how it works with fusions. Is it the
Aha!
I think I know why this happens.
The latest versions of ansi-terminal and hspec do not work together. Cabal
picks the latest ansi-terminal (0.6) first, then the latest hspec that
doesn't conflict with this choice is 0.3.0.
I can confirm this by the following:
$ cabal install hspec
On 25 January 2013 14:46, Ozgur Akgun ozgurak...@gmail.com wrote:
The latest versions of ansi-terminal and hspec do not work together. Cabal
picks the latest ansi-terminal (0.6) first, then the latest hspec that
doesn't conflict with this choice is 0.3.0.
If this happens because the dependency
I'm happy to announce a new package called gray-extended
http://hackage.haskell.org/package/gray-extended-1.2
https://github.com/mhwombat/gray-extended (github)
ABOUT GRAY-EXTENDED:
Gray codes satisfy the property that two successive values
differ in only one digit. Usually the term
I'm happy to announce a new package called Créatúr (creatur)
http://hackage.haskell.org/package/creatur
https://github.com/mhwombat/creatur-examples/raw/master/Tutorial.pdf
(tutorial)
https://github.com/mhwombat/creatur (github)
ABOUT CRÉATÚR:
Créatúr is a software framework for
This is a library for sysadmins and/or tool writers. It provides proper
types and correct serialization for Logstash messages, along with small
utilities for working with ElasticSearch or Redis (using hedis). This
library focus will be on safety (no messages lost).
Right now, it can be used to:
*
For someone as lazy as myself:
http://hackage.haskell.org/package/hslogstash
https://github.com/bartavelle/hslogstash
Cheers,
On Fri, Jan 25, 2013 at 2:48 PM, Simon Marechal si...@banquise.net wrote:
This is a library for sysadmins and/or tool writers. It provides proper
types and correct
Hi Max,
On 25 January 2013 15:58, Max Bolingbroke batterseapo...@hotmail.comwrote:
If this happens because the dependency bounds of ansi-terminal are too
tight then please send me a patch.
No, actually it happens because hspec depends on ansi-terminal-0.5.*.
I am cc'ing Simon Hengel, the
2013/1/25 Daniel Díaz Casanueva dhelta.d...@gmail.com
Yes, you're right about the type context. I always forget that Functor is
not a superclass of Monad. Anyway, the `fmap` can be done only with `Monad`
in the context.
Instead of adding `Functor m` constraint you could write just
f n
People have put a lot of work into regular expression libraries on
haskell. Yet it seems very few of them provide a replace/substitute
function - just regex-compat and regepr as far as I know. Why is that ?
#haskell says:
sclv iirc its because that's a really mutatey operation in the
underlying c
I've needed this recently, too.
End result: I wrote an Attoparsec.Parser Text, and ran the text through
that.
A regex would have been much nicer...
- Clark
On Fri, Jan 25, 2013 at 2:06 PM, Simon Michael si...@joyful.com wrote:
People have put a lot of work into regular expression
turning your Fixed values into Integers
Thanks for that idea.___
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Hello, haskellers. I am trying to write some generic subtyping issue. Here
upcast is always safe operation because of subtype is always behaves like the
parrent type. downcast is not the safe becase of not every parrent type value
can be converted to children type. Rangeable here is the
On Fri, Jan 25, 2013 at 3:18 PM, s9gf4...@gmail.com wrote:
Duplicate instance declarations:
instance [incoherent] (Num a, Ord a, Rangable range a,
Packable range a) =
SubtypeOf range a
-- Defined at ...:22:10
instance [incoherent] (Integral a, Packable range a,
MultipleTo range a) =
This has the code smell of trying to use typeclasses for OOP. That won't
work. (Yes, really.)
I am not trying to use OOP, I am just writing some typecasting at all.
This would be correct. Constraints on an instance are applied *after* the
instance is selected, so when Haskell is looking
On 1/24/13 1:40 AM, Ertugrul Söylemez wrote:
David Thomas davidleotho...@gmail.com wrote:
We could even set up NotOnHackage: a package repository just like
Hackage, except the packages are just documentation on why there is
no such package. Implementation-wise it's just a wiki; but the idea
is
I think it needs to be both places. I know when I'm searching, I often
just go to google with site:hackage.haskell.org inurl:latest I would be
likely to miss it if it were just in the cabal file (although in the
modules it could be as simple as a note saying this is defunct - view the
main page
On 13-01-25 02:06 PM, Simon Michael wrote:
People have put a lot of work into regular expression libraries on
haskell. Yet it seems very few of them provide a replace/substitute
function - just regex-compat and regepr as far as I know. Why is that ?
[...]
Secondly, as of today what do y'all do
By the way, not all databases supported by Persistent have the ability to
represent NUMERIC with perfect precision. I'm fairly certain the SQLite
will just cast to 8-byte reals, though it's possible that it will keep the
data as strings in some circumstances.
According to the documentation,
A brief stylistic note: to me, defunct has a connotation similar to that of
deprecated, just stronger; meaning, it implies something closer to
NoLongerOnHackage rather than wren's more general NotOnHackage. In this
case, the distinction is moot, because the code did happen to exist on
Hackage, but
http://ideone.com/v2CrAm
I has posted to ideone to show what is wrong.___
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On Fri, Jan 25, 2013 at 12:39 PM, s9gf4...@gmail.com wrote:
**
This has the code smell of trying to use typeclasses for OOP. That
won't work. (Yes, really.)
I am not trying to use OOP, I am just writing some typecasting at all.
This would be correct. Constraints on an instance
According to the documentation, SQLite stores whatever you give it,
paying very little heed to the declared type. If you get SQLite to
*compare* two numbers, it will at that point *convert* them to doubles
in order to carry out the comparison. This is quite separate from the
question of
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