Foldable & Traversable instances for ((,) a)

I noticed (to my great dismay!) that ((,) a) doesn't appear to have Foldable or Traversable instance anywhere, even though it is an (almost trivial) instance of both: instance Foldable ((,) a) where foldMap f (_, x) = f x instance Traversable ((,) a) where traverse f (a, x) = (,) a <$> f x I guess the most appropriate place for either would be Data.Tuple of Data.Foldable and Data.Traversable respectively. Kind regards, Merijn Verstraaten

This came up last year, and again recently. The consensus came through to
add them, and recently I believe I was nominated to put together a patch.
I've just not been able to abrogate my other responsibilities long enough
to break my build environment and set up a copy of HEAD and concoct a
patch. ;)
The instances really have to live in Data.Foldable and Data.Traversable
with the Foldable and Traversable classes otherwise you get messy orphan
issues.
-Edward
On Wed, Oct 10, 2012 at 12:04 PM, Merijn Verstraaten wrote: I noticed (to my great dismay!) that ((,) a) doesn't appear to have
Foldable or Traversable instance anywhere, even though it is an (almost
trivial) instance of both: instance Foldable ((,) a) where
foldMap f (_, x) = f x instance Traversable ((,) a) where
traverse f (a, x) = (,) a <$> f x I guess the most appropriate place for either would be Data.Tuple of
Data.Foldable and Data.Traversable respectively. Kind regards,
Merijn Verstraaten
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On Wed, Oct 10, 2012 at 7:32 PM, Edward Kmett
I've just not been able to abrogate my other responsibilities long enough to break my build environment and set up a copy of HEAD and concoct a patch. ;)
I just tried to clone a copy of the base repo to see if I could be of any help, but it doesn't work for me: [ben@euler ~/haskell/upstreams/emptydir]$ git clone http://darcs.haskell.org/packages/base.git Cloning into 'base'... [ben@euler ~/haskell/upstreams/emptydir]$ ls -l total 0 I had a chat with the guys in #git , excerpts from http://colabti.org/irclogger/irclogger_log/git?date=2012-10-10#l3186 : 21:40:43 < cmn> it looks like it only supports the dumb protocol 21:41:01 < cmn> so that should get fixed, it could be that it's broken in newer git versions, because nobody sensible sets that up anymore 21:44:11 < benmachine> cmn: ah. so there's a bug but no-one notices because no-one uses it these days? 21:44:56 < cmn> benmachine: that's what I'm thinking, yeah 21:45:19 < benmachine> cmn: ok. out of interest, how did you check which protocol it was using? 21:45:29 < cmn> benmachine: wireshark 21:49:39 < benmachine> cmn: one more thing, is "the dumb protocol" literally its name, or is it just a protocol that's dumb? 21:50:04 < cmn> its full name is dumb http transport Looks like someone at darcs.haskell.org needs to change how things are set up?

On October 10, 2012 16:54:03 Ben Millwood wrote:
I just tried to clone a copy of the base repo to see if I could be of any help, but it doesn't work for me:
[ben@euler ~/haskell/upstreams/emptydir]$ git clone http://darcs.haskell.org/packages/base.git Cloning into 'base'...
[ben@euler ~/haskell/upstreams/emptydir]$ ls -l total 0
Perhaps someone has already fixed it, but it seems to be working for me. $ git clone http://darcs.haskell.org/packages/base.git Cloning into 'base'... $ ls base/ aclocal.m4 base.cabal codepages config.sub Control Debug Foreign.hs include LICENSE NHC Prelude.hs Setup.hs tests Unsafe base.buildinfo.in cbits config.guess configure.ac Data Foreign GHC install-sh Makefile.nhc98 Numeric.hs prologue.txt System Text Might it also just be that your aren't getting a default branch checked out. Is there a '.git' subdirectory? Is there a bunch files under '.git/objects'? What do you get if you switch into the directory and run 'git branch -r'? $ cd base $ git branch -r origin/HEAD -> origin/master origin/encoding origin/ghc-7.2 origin/ghc-7.4 origin/ghc-7.6 origin/imp-param-class origin/master origin/monad-comp origin/new-typeable Cheers! -Tyson

Works here as well. Could it be a bug in Ben's version of git?
FWIW, mine is 1.7.10.4, packaged by Debian.
Roman
* Tyson Whitehead
On October 10, 2012 16:54:03 Ben Millwood wrote:
I just tried to clone a copy of the base repo to see if I could be of any help, but it doesn't work for me:
[ben@euler ~/haskell/upstreams/emptydir]$ git clone http://darcs.haskell.org/packages/base.git Cloning into 'base'...
[ben@euler ~/haskell/upstreams/emptydir]$ ls -l total 0
Perhaps someone has already fixed it, but it seems to be working for me.
$ git clone http://darcs.haskell.org/packages/base.git Cloning into 'base'... $ ls base/ aclocal.m4 base.cabal codepages config.sub Control Debug Foreign.hs include LICENSE NHC Prelude.hs Setup.hs tests Unsafe base.buildinfo.in cbits config.guess configure.ac Data Foreign GHC install-sh Makefile.nhc98 Numeric.hs prologue.txt System Text
Might it also just be that your aren't getting a default branch checked out.
Is there a '.git' subdirectory? Is there a bunch files under '.git/objects'? What do you get if you switch into the directory and run 'git branch -r'?
$ cd base $ git branch -r origin/HEAD -> origin/master origin/encoding origin/ghc-7.2 origin/ghc-7.4 origin/ghc-7.6 origin/imp-param-class origin/master origin/monad-comp origin/new-typeable
Cheers! -Tyson
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On Wed, Oct 10, 2012 at 10:29 PM, Tyson Whitehead
Is there a '.git' subdirectory? Is there a bunch files under '.git/objects'? What do you get if you switch into the directory and run 'git branch -r'?
No and no - ls -al reports nothing. No 'base' directory is ever created, so I can't apply any git commands to it. Curiously, git ls-remote does seem to work, but git clone fetches nothing and does nothing. I think whether or not it works may depend on your git version. Mine's 1.7.12.2.

On Thu, Oct 11, 2012 at 12:00 PM, Ben Millwood
On Wed, Oct 10, 2012 at 10:29 PM, Tyson Whitehead
wrote: Is there a '.git' subdirectory? Is there a bunch files under '.git/objects'? What do you get if you switch into the directory and run 'git branch -r'?
No and no - ls -al reports nothing. No 'base' directory is ever created, so I can't apply any git commands to it. Curiously, git ls-remote does seem to work, but git clone fetches nothing and does nothing.
I think whether or not it works may depend on your git version. Mine's 1.7.12.2.
For what its worth, I'm using git 1.7.12.3 from MacPorts, and I get an empty directory and a system popup indicating that git-http-remote has crashed. My shell then reports exit status 128 from git. -- brandon s allbery kf8nh sine nomine associates allbery.b@gmail.com ballbery@sinenomine.net unix/linux, openafs, kerberos, infrastructure http://sinenomine.net

On Thu, 2012-10-11 at 12:07 -0400, Brandon Allbery wrote:
On Thu, Oct 11, 2012 at 12:00 PM, Ben Millwood
wrote: I think whether or not it works may depend on your git version. Mine's 1.7.12.2.
For what its worth, I'm using git 1.7.12.3 from MacPorts, and I get an empty directory and a system popup indicating that git-http-remote has crashed. My shell then reports exit status 128 from git.
To add another works for me data point here -- git 1.7.10 under Debian.
From the reports so far, it does sounds very much like a version thing.
Cheers! -Tyson

Ben Millwood
On Wed, Oct 10, 2012 at 10:29 PM, Tyson Whitehead
wrote: Is there a '.git' subdirectory? Is there a bunch files under '.git/objects'? What do you get if you switch into the directory and run 'git branch -r'?
No and no - ls -al reports nothing. No 'base' directory is ever created, so I can't apply any git commands to it.
actually, it might have been created and got removed again when 'git clone' failed... this happens for instance when the 'git-remote-http' process dies abruptly (maybe some network error occured during the HTTP transfer which confused git-remote-http and caused it to bailout?)
participants (7)
-
Ben Millwood
-
Brandon Allbery
-
Edward Kmett
-
Herbert Valerio Riedel
-
Merijn Verstraaten
-
Roman Cheplyaka
-
Tyson Whitehead