[GHC] #7528: Non terminating thunk resolution blocks world, even in the case of forkOS
#7528: Non terminating thunk resolution blocks world, even in the case of forkOS
+---
Reporter: timthelion | Owner:
Type: bug | Status: new
Priority: normal | Component: Runtime System
Version: 7.4.2| Keywords: forkOS Concurrent
thunk
Os: Unknown/Multiple | Architecture: x86_64 (amd64)
Failure: Incorrect result at runtime | Blockedby:
Blocking: |Related:
+---
Please see:
http://comments.gmane.org/gmane.comp.lang.haskell.cafe/102479
{-# LANGUAGE ScopedTypeVariables #-}
import Control.Concurrent
main = do
putStrLn Hello
forkOS neverEnds
putStrLn Bye bye --We never get here(or at least I don't).
neverEnds = do
let (a::String) = a
putStrLn a
--
Ticket URL: http://hackage.haskell.org/trac/ghc/ticket/7528
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[GHC] #7529: Crash when using (-) instead of (=) in a typeclass instance
#7529: Crash when using (-) instead of (=) in a typeclass instance ---+ Reporter: Helkafen| Owner: Type: bug | Status: new Priority: normal | Component: Compiler (Parser) Version: 7.4.1 | Keywords: Os: Linux | Architecture: x86 Failure: Compile-time crash | Blockedby: Blocking: |Related: ---+ import qualified Data.Vector as V import Test.QuickCheck import Control.Monad (liftM) instance (Arbitrary a) - Arbitrary (V.Vector a) where arbitrary = fmap V.fromList arbitrary main = do print bla The arrow is obviously incorrect. runghc thisfile tells me: *** Exception: compiler/rename/RnSource.lhs:429:14-81: Irrefutable pattern failed for pattern Data.Maybe.Just (inst_tyvars, _, SrcLoc.L _ cls, _) -- Ticket URL: http://hackage.haskell.org/trac/ghc/ticket/7529 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler ___ Glasgow-haskell-bugs mailing list Glasgow-haskell-bugs@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-bugs
[GHC] #7530: Proposal: Add isLeft/isRight to Data.Either
#7530: Proposal: Add isLeft/isRight to Data.Either
-+--
Reporter: SimonHengel | Owner:
Type: bug | Status: new
Priority: normal| Component: Compiler
Version: 7.6.1 | Keywords:
Os: Unknown/Multiple | Architecture: Unknown/Multiple
Failure: None/Unknown | Blockedby:
Blocking:|Related:
-+--
I propose to add {{{isLeft}}}/{{{isRight}}} to {{{Data.Either}}}. The
corresponding thread on {{{haskell-liraries}}} is here:
http://www.haskell.org/pipermail/libraries/2012-November/018976.html
--
Ticket URL: http://hackage.haskell.org/trac/ghc/ticket/7530
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Re: [GHC] #7530: Proposal: Add isLeft/isRight to Data.Either
#7530: Proposal: Add isLeft/isRight to Data.Either -+-- Reporter: SimonHengel | Owner: Type: feature request | Status: new Priority: normal| Component: libraries/base Version: 7.6.1 | Keywords: Os: Unknown/Multiple | Architecture: Unknown/Multiple Failure: None/Unknown | Blockedby: Blocking:|Related: -+-- Changes (by SimonHengel): * type: bug = feature request * component: Compiler = libraries/base -- Ticket URL: http://hackage.haskell.org/trac/ghc/ticket/7530#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler ___ Glasgow-haskell-bugs mailing list Glasgow-haskell-bugs@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-bugs
Re: [GHC] #7529: Crash when using (-) instead of (=) in a typeclass instance
#7529: Crash when using (-) instead of (=) in a typeclass instance
-+--
Reporter: Helkafen |Owner:
Type: bug | Status: closed
Priority: normal|Component: Compiler (Parser)
Version: 7.4.1 | Resolution: duplicate
Keywords:| Os: Linux
Architecture: x86 | Failure: Compile-time crash
Blockedby:| Blocking:
Related:|
-+--
Changes (by monoidal):
* status: new = closed
* resolution: = duplicate
Comment:
Thanks for the report, the bug is already fixed in GHC 7.6.1, see #5951.
Now you get
{{{
T.hs:5:10:
Malformed instance: (Arbitrary a) - Arbitrary (V.Vector a)
}}}
--
Ticket URL: http://hackage.haskell.org/trac/ghc/ticket/7529#comment:1
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[GHC] #7531: after manualy installing array-0.4.0.1
#7531: after manualy installing array-0.4.0.1 -+-- Reporter: guest | Owner: Type: bug | Status: new Priority: normal| Component: Package system Version: 7.6.1 | Keywords: Os: Windows | Architecture: x86_64 (amd64) Failure: None/Unknown | Blockedby: Blocking:|Related: -+-- After manually installing array-0.4.0.1 installation manually of Cabal -1.16.0.3 print: c:\download\archive\Cabal\1.16.0.3\Cabal-1.16.0.3runghc Setup.hs install ghc: panic! (the 'impossible' happened) (GHC version 7.4.2 for i386-unknown-mingw32): interactiveUI:setBuffering2 Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug -- Ticket URL: http://hackage.haskell.org/trac/ghc/ticket/7531 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler ___ Glasgow-haskell-bugs mailing list Glasgow-haskell-bugs@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-bugs
Re: [GHC] #7528: Non terminating thunk resolution blocks world, even in the case of forkOS
#7528: Non terminating thunk resolution blocks world, even in the case of forkOS +--- Reporter: timthelion | Owner: Type: bug | Status: new Priority: normal | Component: Runtime System Version: 7.4.2| Keywords: forkOS Concurrent thunk Os: Unknown/Multiple | Architecture: x86_64 (amd64) Failure: Incorrect result at runtime | Blockedby: Blocking: |Related: +--- Comment(by cdupont): I reproduced the bug in 7.4.1 compiled with ghc -threaded. However, runnning main in ghci doesn't show the bug (it finishes correctly). -- Ticket URL: http://hackage.haskell.org/trac/ghc/ticket/7528#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler ___ Glasgow-haskell-bugs mailing list Glasgow-haskell-bugs@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-bugs
Re: [GHC] #7528: Non terminating thunk resolution blocks world, even in the case of forkOS
#7528: Non terminating thunk resolution blocks world, even in the case of forkOS +--- Reporter: timthelion | Owner: Type: bug | Status: new Priority: normal | Component: Runtime System Version: 7.4.2| Keywords: forkOS Concurrent thunk Os: Unknown/Multiple | Architecture: Unknown/Multiple Failure: Incorrect result at runtime | Blockedby: Blocking: |Related: +--- Changes (by Yuras): * cc: shumovichy@… (added) * architecture: x86_64 (amd64) = Unknown/Multiple Comment: Seems to be a duplicate of #367: you have a loop without allocations and the scheduler doesn't have chance to reschedule the thread. I can reproduce it with the HEAD with -O0. With -O1 it works ok for me. It works with -O0 -fno-omit-yields too. -- Ticket URL: http://hackage.haskell.org/trac/ghc/ticket/7528#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler ___ Glasgow-haskell-bugs mailing list Glasgow-haskell-bugs@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-bugs
Fundeps and type equality
I ran into a simple falure with functional dependencies (in GHC 7.4.1): class Foo a ta | a - ta foo :: (Foo a ta, Foo a tb, Eq ta) = ta - tb - Bool foo = (==) I expected that the `a - ta` functional dependency would suffice to prove that `ta ~ tb`, but Pixie/Bug1.hs:9:7: Could not deduce (ta ~ tb) from the context (Foo a ta, Foo a tb, Eq ta) bound by the type signature for foo :: (Foo a ta, Foo a tb, Eq ta) = ta - tb - Bool at Pixie/Bug1.hs:9:1-10 `ta' is a rigid type variable bound by the type signature for foo :: (Foo a ta, Foo a tb, Eq ta) = ta - tb - Bool at Pixie/Bug1.hs:9:1 `tb' is a rigid type variable bound by the type signature for foo :: (Foo a ta, Foo a tb, Eq ta) = ta - tb - Bool at Pixie/Bug1.hs:9:1 Expected type: ta - tb - Bool Actual type: ta - ta - Bool In the expression: (==) In an equation for `foo': foo = (==) Failed, modules loaded: none. Any insights about what's going wrong here? -- Conal ___ Glasgow-haskell-bugs mailing list Glasgow-haskell-bugs@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-bugs
Re: Fundeps and type equality
Hello Conal, GHC implementation of functional dependencies is incomplete: it will use functional dependencies during type inference (i.e., to determine the values of free type variables), but it will not use them in proofs, which is what is needed in examples like the one you posted. The reason some proving is needed is that the compiler needs to figure out that for each instantiation of the type `ta` and `tb` will be the same (which, of course, follows directly from the FD on the class). As far as I understand, the reason that GHC does not construct such proofs is that it can't express them in its internal proof language (System FC). It seems to me that it should be fairly straight-forward to extend FC to support this sort of proof, but I have not been able to convince folks that this is the case. I could elaborate, if there's interest. In the mean time, the way forward would probably be to express the dependency using type families, which I find tends to be more verbose but, at present, is better supported in GHC. Cheers, -Iavor PS: cc-ing the GHC users' list, as there was some talk of closing the ghc-bugs list, but I am not sure if the transition happened yet. On Tue, Dec 25, 2012 at 6:15 PM, Conal Elliott co...@conal.net wrote: I ran into a simple falure with functional dependencies (in GHC 7.4.1): class Foo a ta | a - ta foo :: (Foo a ta, Foo a tb, Eq ta) = ta - tb - Bool foo = (==) I expected that the `a - ta` functional dependency would suffice to prove that `ta ~ tb`, but Pixie/Bug1.hs:9:7: Could not deduce (ta ~ tb) from the context (Foo a ta, Foo a tb, Eq ta) bound by the type signature for foo :: (Foo a ta, Foo a tb, Eq ta) = ta - tb - Bool at Pixie/Bug1.hs:9:1-10 `ta' is a rigid type variable bound by the type signature for foo :: (Foo a ta, Foo a tb, Eq ta) = ta - tb - Bool at Pixie/Bug1.hs:9:1 `tb' is a rigid type variable bound by the type signature for foo :: (Foo a ta, Foo a tb, Eq ta) = ta - tb - Bool at Pixie/Bug1.hs:9:1 Expected type: ta - tb - Bool Actual type: ta - ta - Bool In the expression: (==) In an equation for `foo': foo = (==) Failed, modules loaded: none. Any insights about what's going wrong here? -- Conal ___ Glasgow-haskell-bugs mailing list Glasgow-haskell-bugs@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-bugs ___ Glasgow-haskell-bugs mailing list Glasgow-haskell-bugs@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-bugs
Re: [GHC] #4363: openFile sharing permissions are inconsistent across platforms
#4363: openFile sharing permissions are inconsistent across platforms --+- Reporter: jystic | Owner: Type: bug | Status: closed Priority: high | Milestone: 7.6.1 Component: libraries/base |Version: 6.12.3 Resolution: fixed| Keywords: Os: Windows | Architecture: Unknown/Multiple Failure: Incorrect result at runtime | Difficulty: Unknown Testcase: | Blockedby: Blocking: |Related: --+- Changes (by PHO): * cc: pho@… (added) -- Ticket URL: http://hackage.haskell.org/trac/ghc/ticket/4363#comment:17 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler ___ Glasgow-haskell-bugs mailing list Glasgow-haskell-bugs@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-bugs
