- ghc-devs - Haskell.org

arc patch
by Simon Peyton Jones 05 Aug '15

05 Aug '15

Friends I wanted to build a Phab ticket, so I tried arc patch D1069 but it failed, as below. What do I do now? Thanks Simon simonpj@cam-05-unx:~/code/HEAD-5$ arc patch D1069 You have untracked files in this working copy. Working copy: /home/simonpj/code/HEAD-5/ Untracked files in working copy: Foo compiler/basicTypes/T7287.stderr foo libraries/integer-gmp2/GNUmakefile libraries/integer-gmp2/ghc.mk spj-patch testsuite/tests/deriving/should_fail/T2604.hs testsuite/tests/deriving/should_fail/T2604.stderr testsuite/tests/deriving/should_fail/T5863a.hs testsuite/tests/deriving/should_fail/T5863a.stderr testsuite/tests/deriving/should_fail/T7800.hs testsuite/tests/deriving/should_fail/T7800.stderr testsuite/tests/typecheck/should_compile/T9999.hs typeable-msg Since you don't have '.gitignore' rules for these files and have not listed them in '.git/info/exclude', you may have forgotten to 'git add' them to your commit. Do you want to add these files to the commit? [y/N] N N Created and checked out branch arcpatch-D1069. Exception ERR-CONDUIT-CALL: API Method "differential.query" does not define these parameters: 'arcanistProjects'. (Run with --trace for a full exception trace.)

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Typechecker / OverloadedStrings question 7.8 vs. 7.10
by Michael Karg 04 Aug '15

04 Aug '15

Hi devs, in the followin snippet: {-# LANGUAGE OverloadedStrings #-} import Data.Char (isAlphaNum) import Data.ByteString.Char8 as BS (all) main = print $ check str where check = BS.all (\x -> x `elem` valid || isAlphaNum x) -- Line 7 valid = "$_-" -- :: String -- Line 8 str = "foo_bar123" GHC 7.10 fails with the following errors (whereas 7.8 compiles without complaining): ghc --make "Testcase.hs" [1 of 1] Compiling Main ( Testcase.hs, Testcase.o ) Testcase.hs:7:31: No instance for (Foldable t0) arising from a use of ‘elem’ The type variable ‘t0’ is ambiguous (...) Testcase.hs:8:15: No instance for (Data.String.IsString (t0 Char)) arising from the literal ‘"$_-"’ The type variable ‘t0’ is ambiguous (...) Uncommenting the -- :: String type annotation (line 8) makes the snippet acceptable to the typechecker however. So Foldable [] and [Char] should be possible to infer, given the evidence of 'isAlphaNum x', as obviously happens with GHC 7.8. My question is, how or why does the 7.10 typechecker behave differently? Is this intentional, or does this qualify for a trac ticket? Thanks for looking into this, Michael PS: The ByteString part is just there since the snippet is taken out of one of my projects. The following (modified) code only typechecks on 7.10 with both type annotations uncommented: {-# LANGUAGE OverloadedStrings #-} import Data.Char (isAlphaNum) main = print $ check str where check = all (\x -> x `elem` valid || isAlphaNum x) valid = "$_-" -- :: String str = "foo_bar123" -- :: String The errors here are (1) no instances for Foldable and (2) no instances for IsString.

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can't validate on Mac
by Richard Eisenberg 03 Aug '15

03 Aug '15

Hi devs, In a (almost) clean validate on my MacOS 10.8 machine, I see this: {{{ rts/posix/OSMem.c: In function 'my_mmap': rts/posix/OSMem.c:109:15: error: error: variable 'flags' set but not used [-Werror=unused-but-set-variable] int prot, flags; ^ rts/posix/OSMem.c:109:9: error: error: variable 'prot' set but not used [-Werror=unused-but-set-variable] int prot, flags; ^ cc1: all warnings being treated as errors }}} Help? Thanks, Richard

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Building GHC master with GHC 7.6
by Ben Gamari 02 Aug '15

02 Aug '15

Hello everyone, Earlier today I merged a clean-up [1] to the master branch which removed some #ifdefs which ensured that the tree could be built with GHC 7.6 Thomas Miedema correctly pointed out that some nightly builders may not be on GHC 7.8 yet. Do any of the nightly builders call in this category? If so, would it be possible to upgrade? Cheers, - Ben [1] https://phabricator.haskell.org/D904

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Fundep question
by Gabor Greif 31 Jul '15

31 Jul '15

Hi all, say I want to instantiate class Dep (a :: k) b | a -> b as instance Dep x y => Dep (Just x) (Maybe y) Is this supposed to work? I get "The coverage condition fails" errors. For simple cases like instance Dep True Bool etc. it seems to work fine. Thanks and cheers, Gabor

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behavior change of the pretty printer
by Kazu Yamamoto 31 Jul '15

31 Jul '15

Hi, Testing a package with GHC head on Travis CI, I got the following error: ---- expected: Just (HTTPDate {hdYear = 1994, hdMonth = 11, hdDay = 15, hdHour = 8, hdMinute = 12, hdSecond = 31, hdWkday = 2}) but got: Just HTTPDate {hdYear = 1994, hdMonth = 11, hdDay = 15, hdHour = 8, hdMinute = 12, hdSecond = 31, hdWkday = 2} ---- That is, parentheses are not printed. Is this an intentional change of GHC head? --Kazu

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Re: [GHC] #10250: API Annotations : add Locations in hsSyn were layout occurs
by Alan & Kim Zimmerman 31 Jul '15

31 Jul '15

Oops, my mistake, Sorry On Fri, Jul 31, 2015 at 12:59 PM, GHC <ghc-devs(a)haskell.org> wrote: > #10250: API Annotations : add Locations in hsSyn were layout occurs > -------------------------------------+------------------------------------- > Reporter: alanz | Owner: alanz > Type: task | Status: closed > Priority: normal | Milestone: 7.12.1 > Component: Compiler | Version: 7.10.1 > Resolution: fixed | Keywords: > | ApiAnnotations > Operating System: Unknown/Multiple | Architecture: > | Unknown/Multiple > Type of failure: None/Unknown | Test Case: > Blocked By: | Blocking: > Related Tickets: | Differential Revisions: Phab:D815 > -------------------------------------+------------------------------------- > > Comment (by thomie): > > Phab:D815 was landed on master already, so I'm confused by your message. > > If you're requesting for this to be merged to 7.10.3: just reopen, set the > right milestone, and set it to status=merge. Otherwise it gets lost. > > -- > Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10250#comment:6> > GHC <http://www.haskell.org/ghc/> > The Glasgow Haskell Compiler >

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RE: [Diffusion] [Build Failed] rGHC24afe6d3aae1: Fix missing files
by Simon Peyton Jones 30 Jul '15

30 Jul '15

Apparently it still doesn't validate, but I don't understand Harbourmaster's failure report. Seems to be something to do with Haddock though. Anyone able to help? Simon | -----Original Message----- | From: noreply(a)phabricator.haskell.org | [mailto:noreply@phabricator.haskell.org] | Sent: 30 July 2015 17:14 | To: Simon Peyton Jones | Subject: [Diffusion] [Build Failed] rGHC24afe6d3aae1: Fix missing files | | Harbormaster failed to build B5072: rGHC24afe6d3aae1: Fix missing files! | | BRANCHES | master | | USERS | simonpj (Author) | GHC - Testsuite (Auditor) | | COMMIT | https://phabricator.haskell.org/rGHC24afe6d3aae1 | | EMAIL PREFERENCES | https://phabricator.haskell.org/settings/panel/emailpreferences/ | | To: simonpj, GHC - Testsuite

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Re: [Haskell-cafe] ANNOUNCE: GHC version 7.10.2
by Ben Gamari 30 Jul '15

30 Jul '15

James M <jmartin(a)eecs.berkeley.edu> writes: > There was talk from an earlier email thread of releasing the Haskell > Platform at the same time as 7.10.2. > > I am referring to the weekly news of 2015/05/11: > https://ghc.haskell.org/trac/ghc/blog/weekly20150511 > > and this email thread: > https://mail.haskell.org/pipermail/ghc-devs/2015-May/008911.html > > > Was this plan abandoned? Or was there something unexpected that is delaying > it? > Not at all! There ended up being a bit of timing skew between the Platform and GHC releases but an approximately concurrent release is still the plan. The Platform folks are hard at work as we speak, in the final stages of pushing out their release. I expect it will be announced shortly. Unfortunately due to the late notice of the text issue, the initial release will ship with text-1.2.1.1, which is still affected by the rewrite issue. That being said, the impact of this issue is mostly on compile time, in most cases you shouldn't see much impact on runtime performance. Moreover, they will be working to push out another release with text-1.2.1.3 in the coming days. Cheers, - Ben

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Re: [Haskell-cafe] ANNOUNCE: GHC version 7.10.2
by Brandon Allbery 30 Jul '15

30 Jul '15

On Thu, Jul 30, 2015 at 12:52 PM, James M <jmartin(a)eecs.berkeley.edu> wrote: > There was talk from an earlier email thread of releasing the Haskell > Platform at the same time as 7.10.2. I think the right place to ask this is libraries(a)haskell.org. I would imagine they're in final testing and/or getting release packages in place. (Note as previously mentioned that "text" was just updated, and the Platform needs that; this presumably means they had to start over making release packages.) -- brandon s allbery kf8nh sine nomine associates allbery.b(a)gmail.com ballbery(a)sinenomine.net unix, openafs, kerberos, infrastructure, xmonad http://sinenomine.net

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