November 2014 - ghc-tickets

Re: [GHC] #8031: Template Haskell gets confused with kind variables introduced in separate foralls
by GHC 21 Nov '14

21 Nov '14

#8031: Template Haskell gets confused with kind variables introduced in separate foralls -------------------------------------+------------------------------------- Reporter: goldfire | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Template | Version: 7.7 Haskell | Keywords: PolyKinds Resolution: | Architecture: Unknown/Multiple Operating System: | Difficulty: Unknown Unknown/Multiple | Blocked By: Type of failure: | Related Tickets: None/Unknown | Test Case: | Blocking: | Differential Revisions: | -------------------------------------+------------------------------------- Changes (by thomie): * keywords: TemplateHaskell PolyKinds => PolyKinds * component: Compiler => Template Haskell Comment: Module `S3` from the description compiles fine with 7.8.3 and HEAD, but not with 7.8.2. I think that means this ticket can be closed, once a regression test is added. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8031#comment:3> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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Re: [GHC] #8034: Missing ambiguity test for class methods
by GHC 21 Nov '14

21 Nov '14

#8034: Missing ambiguity test for class methods -------------------------------------+------------------------------------- Reporter: simonpj | Owner: Type: bug | Status: new Priority: normal | Milestone: 7.10.1 Component: Compiler | Version: 7.7 (Type checker) | Keywords: Resolution: | Architecture: Unknown/Multiple Operating System: | Difficulty: Unknown Unknown/Multiple | Blocked By: Type of failure: | Related Tickets: None/Unknown | Test Case: | Blocking: | Differential Revisions: | -------------------------------------+------------------------------------- Changes (by thomie): * component: Compiler => Compiler (Type checker) -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8034#comment:2> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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Re: [GHC] #8036: Demand analyser is unpacking too deeply
by GHC 21 Nov '14

21 Nov '14

#8036: Demand analyser is unpacking too deeply -------------------------------------+------------------------------------- Reporter: simonpj | Owner: simonpj Type: bug | Status: new Priority: normal | Milestone: 7.10.1 Component: Compiler | Version: 7.7 Resolution: | Keywords: Operating System: | Architecture: Unknown/Multiple Unknown/Multiple | Difficulty: Unknown Type of failure: | Blocked By: None/Unknown | Related Tickets: #7520 Test Case: | Blocking: | Differential Revisions: | -------------------------------------+------------------------------------- Comment (by thomie): I don't know how to test if this is fixed or not. Quite a few changes have been made to the file `stranal/DmdAnal.lhs` since. The mentioned `pprtrace` is still commented out, but there are many others commented out as well. This ticket is currently not listed on [wiki:Status/SLPJ- Tickets]. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8036#comment:4> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #8046: Make the timer management scale better across multicore
by GHC 21 Nov '14

21 Nov '14

#8046: Make the timer management scale better across multicore ------------------------------------+------------------------------------- Reporter: tibbe | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.6.3 Keywords: | Operating System: Unknown/Multiple Architecture: Unknown/Multiple | Type of failure: None/Unknown Difficulty: Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | ------------------------------------+------------------------------------- A recent commit {{{ commit e843e73690f828498f6e33bb89f47a50c3ab2ac9 Author: Ian Lynagh <ian(a)well-typed.com> Date: Sat Jun 8 20:19:59 2013 +0100 IO manager: Edit the timeout queue directly, rather than using an edit list Fixes #7653. }}} undid an optimization to the management of timeouts (to fix a bug, which is good). We should check how much this hurt performance, but it might be better to rewrite the timeout management altogether. The current scheme scales poorly to several cores. We should probably have one priority queue per core and use an efficient mutable data structure. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8046> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #8054: Undefined symbol during linking
by GHC 21 Nov '14

21 Nov '14

#8054: Undefined symbol during linking ------------------------------------+------------------------------------- Reporter: case | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.6.3 Keywords: | Operating System: Unknown/Multiple Architecture: Unknown/Multiple | Type of failure: None/Unknown Difficulty: Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | ------------------------------------+------------------------------------- On OSX, using GHC 7.6.3 and the package recursion-schemes 3.0.0.2, the following code causes the compiler to emit an error about undefined symbols. Code: {{{ import Data.Functor.Foldable x = project 1 :: Integer main = x `seq` return () }}} Error: {{{ λ ~/ ghc test.hs Linking test ... Undefined symbols for architecture x86_64: "_Main_x_closure", referenced from: _Main_main_info in test.o _Main_main_srt in test.o ld: symbol(s) not found for architecture x86_64 collect2: ld returned 1 exit status }}} -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8054> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #8056: Make Install fails on HEAD
by GHC 21 Nov '14

21 Nov '14

#8056: Make Install fails on HEAD ------------------------------------+------------------------------------- Reporter: fryguybob | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Build System | Version: 7.7 Keywords: | Operating System: Unknown/Multiple Architecture: Unknown/Multiple | Type of failure: None/Unknown Difficulty: Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | ------------------------------------+------------------------------------- I'm trying to build the `perf` flavor of head and I'm getting an error with `make install`. The `quick` flavor works as expected. {{{ $ uname -a Linux ... 3.6.5-1.fc17.x86_64 ... $ ghc --version The Glorious Glasgow Haskell Compilation System, version 7.6.3 $ cabal --version cabal-install version 1.16.0.2 using version 1.16.0.3 of the Cabal library $ gcc --version gcc (GCC) 4.7.2 20120921 (Red Hat 4.7.2-2) ... $ git clone http://darcs.haskell.org/ghc.git/ ghc-7.8/ ... $ cd ghc-7.8 $ ./sync-all --testsuite get ... $ cp mk/build.mk.sample mk/build.mk $ vi mk/build.mk $ diff mk/build.mk mk/build.mk.sample 12c12 < BuildFlavour = perf --- > #BuildFlavour = perf $ perl boot ... $ ./configure --prefix=/localdisk/ryates/ghc-7.8-build/ ... $ make -j8 ... $ make install ... Installing library in /localdisk/ryates/ghc-7.8-build/lib/ghc-7.7.20130711/haskell2010-1.1.1.0 "/localdisk/ryates/ghc-7.8-build/lib/ghc-7.7.20130711/bin/ghc-pkg" --force --global-package-db "/localdisk/ryates/ghc-7.8-build/lib/ghc-7.7.20130711/package.conf.d" update rts/dist/package.conf.install /localdisk/ryates/ghc-7.8-build/lib/ghc-7.7.20130711/bin/ghc-pkg: symbol lookup error: /localdisk/ryates/ghc-7.8-build/lib/ghc-7.7.20130711/bin /ghc-pkg: undefined symbol: base_DataziList_intercalatezuzdspolyzugo_info make[1]: *** [install_packages] Error 127 make: *** [install] Error 2 }}} -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8056> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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Re: [GHC] #2496: Invalid Eq/Ord instances in Data.Version
by GHC 21 Nov '14

21 Nov '14

#2496: Invalid Eq/Ord instances in Data.Version -------------------------------------+------------------------------------- Reporter: guest | Owner: Type: bug | Status: new Priority: normal | Milestone: 7.12.1 Component: Core | Version: 6.8.3 Libraries | Keywords: Resolution: | Architecture: Unknown/Multiple Operating System: | Difficulty: Unknown Unknown/Multiple | Blocked By: Type of failure: | Related Tickets: None/Unknown | Test Case: | Blocking: | Differential Revisions: Phab:D395 | -------------------------------------+------------------------------------- Changes (by thoughtpolice): * owner: duncan => * status: patch => new * milestone: ⊥ => 7.12.1 Comment: Since the patch from Thomas was merged, I'm moving this to 7.12 so we can close it then. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/2496#comment:17> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #9540: unwords is not a good producer
by GHC 21 Nov '14

21 Nov '14

#9540: unwords is not a good producer -------------------------------------+------------------------------------- Reporter: dfeuer | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.9 Keywords: fusion | Operating System: Architecture: Unknown/Multiple | Unknown/Multiple Difficulty: Easy (less than 1 | Type of failure: Runtime hour) | performance bug Blocked By: | Test Case: Related Tickets: | Blocking: | Differential Revisions: -------------------------------------+------------------------------------- I think we can do something like this, once we've fixed `unfoldr`: {{{#!hs unwords = unfoldr go where go [] = Nothing go ("":ws) = Just (' ', ws) go ((l:ls):ws) = Just (l, ls:ws) }}} With my draft `unfoldr`, GHC turns this into {{{#!hs lvl_r1EN lvl_r1EN = C# ' ' Rec { unwords_$sgo unwords_$sgo = \ sc_s1Gx sc1_s1Gy -> case sc_s1Gx of _ { [] -> : lvl_r1EN (unwords_go sc1_s1Gy); : l_a1Ew ls_a1Ex -> : l_a1Ew (unwords_$sgo ls_a1Ex sc1_s1Gy) } unwords_go unwords_go = \ b1_a1Fb -> case b1_a1Fb of _ { [] -> []; : ds_d1F5 ws_a1Ev -> case ds_d1F5 of _ { [] -> : lvl_r1EN (unwords_go ws_a1Ev); : l_a1Ew ls_a1Ex -> : l_a1Ew (unwords_$sgo ls_a1Ex ws_a1Ev) } } end Rec } unwords unwords = \ b'_a1F9 -> unwords_go b'_a1F9 }}} To my untrained eye, that looks pretty reasonable. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9540> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #9822: Add displayException to Exception typeclass
by GHC 21 Nov '14

21 Nov '14

#9822: Add displayException to Exception typeclass -------------------------------------+------------------------------------- Reporter: snoyberg | Owner: snoyberg Type: feature request | Status: new Priority: normal | Milestone: Component: libraries/base | Version: 7.9 Keywords: | Operating System: Architecture: Unknown/Multiple | Unknown/Multiple Difficulty: Easy (less than 1 | Type of failure: hour) | None/Unknown Blocked By: | Test Case: Related Tickets: | Blocking: | Differential Revisions: -------------------------------------+------------------------------------- Discussed on the libraries list at: https://www.haskell.org/pipermail/libraries/2014-November/024176.html I am only implementing part (1) of this proposal due to lack of consensus on part (2). -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9822> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #9816: Add function for size-checked conversion of Integral types
by GHC 21 Nov '14

21 Nov '14

#9816: Add function for size-checked conversion of Integral types -------------------------------------+------------------------------------- Reporter: spl | Owner: Type: feature request | Status: new Priority: normal | Milestone: Component: libraries/base | Version: 7.9 Keywords: | Operating System: Architecture: Unknown/Multiple | Unknown/Multiple Difficulty: Unknown | Type of failure: Blocked By: | None/Unknown Related Tickets: | Test Case: | Blocking: | Differential Revisions: -------------------------------------+------------------------------------- Based on the discussion in [http://thread.gmane.org/gmane.comp.lang.haskell.libraries/23338 this thread], I would like to add a function to the {{{base}}} library that is similar to {{{fromIntegral}}} but only successful if the argument fits in the result type. If possible, I would like to get this into 7.10. My apologies for running late on it. Hopefully, since it is a relatively small change overall, the "only" controversy will be bikeshedding. I have concluded that adding @hvr's {{{intCastMaybe}}} from [http://hackage.haskell.org/package/int-cast int-cast] is the best possible option. Previously, I thought a {{{Bounded}}}-based version was also useful; however, I realized that it did not deal properly with conversions like {{{Int<->Word}}}/{{{Int8<->Word8}}}/etc. as well as {{{intCastMaybe}}} and would need specialized versions that {{{intCastMaybe}}} provides automatically. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9816> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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