November 2016 - ghc-tickets

Re: [GHC] #2168: ghci should show haddock comments for identifier
by GHC 20 Nov '16

20 Nov '16

#2168: ghci should show haddock comments for identifier -------------------------------------+------------------------------------- Reporter: j.waldmann | Owner: Type: feature request | Status: new Priority: normal | Milestone: Component: GHCi | Version: 6.8.2 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by adamse): I am intersted in implementing this. Does anyone have any thoughts about how? Perhaps someone has already started on this a bit? My tentative plan of attack is 1. Modify ghc to include the docs in interface files (Modify IfaceSyn.IfaceDecl to optionally include docs) 2. Add a :doc command to ghci Once that is done the next step would be to modify Haddock to take advantage of this. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/2168#comment:25> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #12757: Compiled program segfaults at -O1
by GHC 19 Nov '16

19 Nov '16

#12757: Compiled program segfaults at -O1 -------------------------------------+------------------------------------- Reporter: hvr | Owner: Type: bug | Status: new Priority: highest | Milestone: 8.0.2 Component: Compiler | Version: 8.1 Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: Runtime crash Unknown/Multiple | Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- This affects GHC 8.0.2dev (d84a824cebe94711528727bcb587bfc369ec36a2) as well as GHC HEAD (c23dc6164d54eacc654516b885104dc8b7678f16) The following program results in a segfault when compiled at -O1 or more: {{{#!hs {-# LANGUAGE OverloadedStrings #-} module Main (main) where import Data.ByteString (ByteString) import qualified Data.ByteString as B answers :: [ByteString] answers = map (B.filter (/= 0x20)) [ "e3b0c442 98fc1c14 9afbf4c8 996fb924 27ae41e4 649b934c a495991b 7852b855" , "d7a8fbb3 07d78094 69ca9abc b0082e4f 8d5651e4 6d3cdb76 2d02d0bf 37c9e592" , "e4c4d8f3 bf76b692 de791a17 3e053211 50f7a345 b46484fe 427f6acc 7ecc81be" , "ba7816bf 8f01cfea 414140de 5dae2223 b00361a3 96177a9c b410ff61 f20015ad" , "248d6a61 d20638b8 e5c02693 0c3e6039 a33ce459 64ff2167 f6ecedd4 19db06c1" , "cf5b16a7 78af8380 036ce59e 7b049237 0b249b11 e8f07a51 afac4503 7afee9d1" , "cdc76e5c 9914fb92 81a1c7e2 84d73e67 f1809a48 a497200e 046d39cc c7112cd0" ] x, y :: ByteString x = "e3b0c442 98fc1c14 9afbf4c8 996fb924 27ae41e4 649b934c a495991b 7852b855" y = B.filter (/= 0x20) x main :: IO () main = do print (seq x ()) print (seq y ()) print (length answers) print (seq (head answers) ()) -- segfault! }}} {{{ $ ghc-8.0.2 -fforce-recomp --make -O1 bug.hs && ./bug [1 of 1] Compiling Main ( bug.hs, bug.o ) Linking bug ... () () 7 Segmentation fault }}} {{{ $ ghc-8.0.2 -fforce-recomp --make -O0 bug.hs && ./bug [1 of 1] Compiling Main ( bug.hs, bug.o ) Linking bug ... () () 7 () }}} I haven't yet investigated why this happens. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12757> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #12856: Code comments mention wrong Module for definition of EquationInfo
by GHC 19 Nov '16

19 Nov '16

#12856: Code comments mention wrong Module for definition of EquationInfo -------------------------------------+------------------------------------- Reporter: AndreasK | Owner: Type: bug | Status: new Priority: lowest | Milestone: Component: Documentation | Version: 8.1 Keywords: | Operating System: Unknown/Multiple Architecture: Other | Type of failure: Documentation | bug Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- In compiler/deSugar/Match.hs the description mentions {{{ There is a type synonym, @EquationInfo@, defined in module @DsUtils@. }}} However EquationInfo is defined as data type in compiler/deSugar/DsMonad.hs:96 -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12856> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #12853: Unpromoted tuples in TH in correctly accepted by tthe type checker
by GHC 19 Nov '16

19 Nov '16

#12853: Unpromoted tuples in TH in correctly accepted by tthe type checker -------------------------------------+------------------------------------- Reporter: erikd | Owner: Type: bug | Status: new Priority: normal | Milestone: 8.2.1 Component: Compiler | Version: 8.1 (Type checker) | Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: Other Unknown/Multiple | Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- This issue was discovered when writing tests for #11629. Test case: {{{#!hs {-# LANGUAGE DataKinds #-} {-# LANGUAGE TemplateHaskell #-} {-# LANGUAGE KindSignatures #-} {-# LANGUAGE FlexibleInstances #-} module T11629 where import Control.Monad import Language.Haskell.TH class C (a :: Bool) class D (a :: (Bool, Bool)) class E (a :: [Bool]) instance C True instance C 'False instance D '(True, False) instance D '(False, True) instance E '[True, False] instance E '[False, True] do let getType (InstanceD _ _ ty _) = ty getType _ = error "getType: only defined for InstanceD" failMsg a ty1 ty2 = fail $ "example " ++ a ++ ": ty1 /= ty2, where\n ty1 = " ++ show ty1 ++ "\n ty2 = " ++ show ty2 withoutSig (ForallT tvs cxt ty) = ForallT tvs cxt (withoutSig ty) withoutSig (AppT ty1 ty2) = AppT (withoutSig ty1) (withoutSig ty2) withoutSig (SigT ty ki) = withoutSig ty withoutSig ty = ty -- test #2: type quotations and reified types should agree wrt -- promoted tuples. ty1 <- [t| D '(True, False) |] ty2 <- [t| D (False, True) |] ClassI _ insts <- reify ''D let [ty1', ty2'] = map (withoutSig . getType) insts when (ty1 /= ty1') $ failMsg "C" ty1 ty1' when (ty2 /= ty2') $ failMsg "D" ty2 ty2' return [] }}} According to @RyanlGlScott in https://phabricator.haskell.org/D2188#79228 the code `D (True, False)` in regular Haskell code would be rejected as a Kind error, whereas when its in Oxford brackets like `[t| D (True, False) |]`, it manages to sneak through the type checker. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12853> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #12675: Simplifier ticks exhausted
by GHC 19 Nov '16

19 Nov '16

#12675: Simplifier ticks exhausted --------------------------------------+--------------------------------- Reporter: davean | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.0.1 Keywords: | Operating System: Linux Architecture: x86_64 (amd64) | Type of failure: None/Unknown Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: --------------------------------------+--------------------------------- Works with "-fsimpl-tick-factor=102". Code is: ... import qualified Data.Vector.Unboxed as UV import qualified Data.Vector.Generic as VG import qualified Data.Vector.Algorithms.Tim as Tim ... ∀ v alphabet. (VG.Vector v alphabet, Ord (v alphabet)) ⇒ v alphabet → SA ... SA ∘ VG.modify (Tim.sortBy (lexSuffixCmp st)) ∘ UV.enumFromN 0 $ VG.length st+1 ... -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12675> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #12079: seg fault while using gtk
by GHC 19 Nov '16

19 Nov '16

#12079: seg fault while using gtk --------------------------------------+---------------------------------- Reporter: doofin | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.10.3 Keywords: | Operating System: Linux Architecture: x86_64 (amd64) | Type of failure: Runtime crash Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: --------------------------------------+---------------------------------- {{{#!hs {-# LANGUAGE OverloadedStrings #-} module Main where import Graphics.UI.Gtk import System.Glib.Signals import Graphics.UI.Gtk.SourceView import Graphics.UI.Gtk.SourceView.SourceGutter import Graphics.UI.Gtk.SourceView.SourceCompletion import Graphics.UI.Gtk.SourceView.SourceMark import Graphics.UI.Gtk.SourceView.SourceBuffer import Graphics.UI.Gtk.Multiline.TextBuffer import Graphics.UI.Gtk.Gdk.EventM import Control.Monad.Trans import System.FSNotify import System.Environment import Control.Concurrent (threadDelay) import Control.Monad (forever) import qualified Data.Text as T import qualified Data.Text.IO as T import Data.Tuple import Data.Tuple.HT import Control.Concurrent main=do args<-getArgs print args let filename=head args txt<-T.readFile filename gtk txt $ \srcbf->do notify $ \evt -> case evt of Modified fp _->if (T.unpack $ Prelude.last $ T.splitOn "/" $ T.pack fp)==filename then do txtnew<-T.readFile $ head args postGUIAsync $ textBufferSetText srcbf (txtnew::T.Text) else return () _->return () return () notify action=withManager $ \mgr-> do --mgr<-startManager watchTree mgr -- manager "." -- directory to watch (const True) -- predicate $ \evt->do print evt-- action action evt forever $ threadDelay 1000000 -- sleep forever (until interrupted) gtk inittext act= do initGUI window <- windowNew windowSetDefaultSize window 900 600 windowSetPosition window WinPosCenter srcbf<-sourceBufferNew Nothing sourceView <- sourceViewNewWithBuffer srcbf scrolledWindow <- scrolledWindowNew Nothing Nothing sourceViewSetShowLineNumbers sourceView True textViewSetWrapMode sourceView WrapWord textBufferInsertAtCursor srcbf ("fdsf"::String) textBufferSetText srcbf inittext scrolledWindow `containerAdd` sourceView window `containerAdd` scrolledWindow widgetShowAll window on sourceView keyPressEvent $ do kl<-eventKeyName liftIO $ putStr $ show $ kl liftIO $ mapM_ (\(x,y)->if x==kl then textBufferInsertAtCursor srcbf (y::String) else return ()) pairs return False on window deleteEvent $ liftIO mainQuit >> return False connectGeneric "notify::cursor-position" False srcbf $ do print "adsfd" forkIO $ do act srcbf --onDestroy window mainQuit mainGUI pairs=[("parenleft",")"),("[","]")] }}} the program runs ok before adding the line {{{#!hs connectGeneric "notify::cursor-position" False srcbf $ do print "adsfd" }}} then i run ghc thisfile.hs -debug gdb thisfile run somefile move the cursor inside the textview,then seg fault happened bt {{{ result: Program received signal SIGSEGV, Segmentation fault. 0x00007fffeea0f4f0 in ?? () (gdb) bt #0 0x00007fffeea0f4f0 in ?? () #1 0x00000000000002f5 in ?? () #2 0x0000000000000309 in ?? () #3 0x00007fffffff44f8 in ?? () #4 0x00007fffffff4458 in ?? () #5 0x00007fff04fe0101 in ?? () #6 0x0000000000000113 in ?? () #7 0x00000000000002e5 in ?? () #8 0x0000000001db00ac in ?? () #9 0x00007fffeea13a21 in ?? () #10 0x00007fffeeaf5010 in ?? () #11 0x0000000000a8d709 in base_GHCziIOziFD_zdfBufferedIOFD2_closure () #12 0x00007fffeea07942 in ?? () #13 0x0000000000a8593a in base_GHCziIOziBuffer_WriteBuffer_closure () #14 0x0000000000000800 in ?? () #15 0x0000000000000000 in ?? () }}} -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12079> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #11532: ghc: panic! occured
by GHC 19 Nov '16

19 Nov '16

#11532: ghc: panic! occured -------------------------------------+------------------------------------- Reporter: cutsea | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.10.3 Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: None/Unknown Unknown/Multiple | Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- I'd like to try install by following: {{{ $ cabal sandbox init $ cabal install metadata Resolving dependencies... Notice: installing into a sandbox located at /home/cutsea110/devel/haskell/sandbox/.cabal-sandbox Configuring metadata-0.4.2.0... Building metadata-0.4.2.0... : : [1036 of 1286] Compiling Text.HTML5.MetaData.Schema.TelevisionStation[boot] ( Text/HTML5/MetaData/Schema/TelevisionStation.hs-boot, dist/dist-sandbox- 304cb20a/build/Text/HTML5/MetaData/Schema/TelevisionStation.o-boot ) [1037 of 1286] Compiling Text.HTML5.MetaData.Schema.TelevisionStation ( Text/HTML5/MetaData/Schema/TelevisionStation.hs, dist/dist-sandbox- 304cb20a/build/Text/HTML5/MetaData/Schema/TelevisionStation.o ) ghc: panic! (the 'impossible' happened) (GHC version 7.10.3 for x86_64-unknown-linux): LocalReg's live-in to graph cpd3t {_sp8MJ::P64} Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug cabal: Error: some packages failed to install: metadata-0.4.2.0 failed during the building phase. The exception was: ExitFailure 1 }}} -- regards. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11532> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #12754: Adding an explicit export list halves compilation time.
by GHC 18 Nov '16

18 Nov '16

#12754: Adding an explicit export list halves compilation time. -------------------------------------+------------------------------------- Reporter: mpickering | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.0.1 Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: None/Unknown Unknown/Multiple | Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- A file only containing a 10000 constructor enumeration type compiles twice as fast with an explicit export list compare to having no export list. {{{ # print "module A where" print "module A (T ( .. ) ) where" print "\n" print "data T = C" for i in range(0,10000): print (" | C" + str(i)) }}} Without an export list: {{{ [1 of 1] Compiling A ( A.hs, A.o ) real 0m22.872s user 0m19.653s sys 0m0.868s }}} With the export list: {{{ [1 of 1] Compiling A ( A.hs, A.o ) real 0m11.249s user 0m10.428s sys 0m0.435s }}} The culprit here is `exports_from_avail`, in the case that no export list is provided, the things to export are gathered from the `GlobalRdrEnv`. Each constructor is placed in its own `Avail` which are then combined by `plusAvail` which is implemented using the expensive `unionLists`. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12754> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #12840: GHC-internal triplets passed to sub-project configure scripts
by GHC 18 Nov '16

18 Nov '16

#12840: GHC-internal triplets passed to sub-project configure scripts -------------------------------------+------------------------------------- Reporter: shlevy | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Build System | Version: 8.1 Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: None/Unknown Unknown/Multiple | Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- In some cases GHC normalizes the target triplet passed to configure to a value that is not a valid autoconf target. #12487 mistakenly changed the build to pass these triplets to sub-project configure scripts, such as that for 'base', causing a configure error. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12840> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #12777: reify yields the wrong type in the presence of functional rependencies
by GHC 18 Nov '16

18 Nov '16

#12777: reify yields the wrong type in the presence of functional rependencies -------------------------------------+------------------------------------- Reporter: | Owner: facundo.dominguez | Type: bug | Status: new Priority: normal | Milestone: 8.0.2 Component: Compiler | Version: 8.0.1 Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: None/Unknown Unknown/Multiple | Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- {{{reify}}} yields an incomplete type in the following program. {{{ {-# LANGUAGE TemplateHaskell #-} {-# LANGUAGE FunctionalDependencies #-} module B where import Language.Haskell.TH as TH import Language.Haskell.TH.Syntax as TH class C a b | a -> b where yo :: a -> IO b instance C Bool Int where yo = undefined t3 :: IO () t3 = do x <- yo True $(do addModFinalizer $ TH.reify 'x >>= runIO . print [| return () |] ) }}} {{{ $ inplace/bin/ghc-stage2 B.hs -fforce-recomp [1 of 1] Compiling B ( B.hs, B.o ) VarI x_1627401898 (VarT a_1627404604) Nothing }}} The problem seems to be that finalizers run before functional dependencies are considered. Hacking ghc to run finalizers after {{{simplifyTop}}} produces the expected output instead: {{{ $ inplace/bin/ghc-stage2 B.hs -fforce-recomp [1 of 1] Compiling B ( B.hs, B.o ) VarI x_1627404863 (ConT GHC.Types.Int) Nothing }}} Would anyone object to running finalizers after {{{simplifyTop}}}? This implies that finalizers shouldn't add definitions (with {{{addTopDecls}}}) which depend on {{{simplifyTop}}} to be type-checked. Another option is to call {{{simplifyTop}}} before and after running finalizers. But is it safe to do so? -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12777> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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