#8956: A Particular Section Slimming Bathing Suits For
------------------------------------+-------------------------------------
Reporter: shozzsho1 | 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: |
------------------------------------+-------------------------------------
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--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8956>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
#8945: GHC produces grouped declarations in a weird order
------------------------------------+-------------------------------------
Reporter: Fuuzetsu | Owner:
Type: bug | Status: new
Priority: normal | Milestone:
Component: GHC API | Version: 7.9
Keywords: | Operating System: Unknown/Multiple
Architecture: Unknown/Multiple | Type of failure: None/Unknown
Difficulty: Unknown | Test Case:
Blocked By: | Blocking:
Related Tickets: |
------------------------------------+-------------------------------------
Consider very simple module like
{{{#!haskell
module J where
class A a where
f, g, h, i :: a -> ()
}}}
Now when we ask GHC about declarations in the module and extract function
signatures, we don't get {{{f, g, h, i :: a -> ()}}} as we could expect.
We instead get {{{f, i, h, g :: a -> ()}}}. The pattern is that the first
name is in a correct position and the rest is reversed. This leads to
whatever uses the API get the names in order different than that in the
source file. See http://trac.haskell.org/haddock/ticket/188 for an example
when this matters.
I have prepared an example using GHC API which you can run on your machine
with your own test files and see the results for yourselves.
{{{#!haskell
-- GHC.Paths requires the very small ghc-paths package.
-- if you don't want it, libdir = ghc --print-libdir
module Main where
import Control.Monad (ap, liftM2)
import Data.Functor ((<$>))
import System.Environment (getArgs)
import Digraph (flattenSCCs)
import GHC
import GHC.Paths (libdir)
import Outputable (text, ppr, showSDoc, (<>), (<+>))
main :: IO ()
main = do
(dfs, modules) <- getArgs >>= withGhc Nothing . processModules
let r = map (showSDoc dfs . (\(x,y) -> text x <> text ":" <+> ppr y) .
f)
modules
putStrLn $ unlines r
where
f (s, t) = (ms_hspp_file s, (\(x,_,_,_) -> x) <$> tm_renamed_source t)
type ModuleName' = String
withGhc :: Maybe DynFlags -> Ghc a -> IO (DynFlags, a)
withGhc d act =
runGhc (Just libdir) $ do
dynflags <- case d of
Nothing -> getSessionDynFlags
Just d' -> return d'
_ <- setSessionDynFlags dynflags
liftM2 (,) getSessionDynFlags act
processModules :: [ModuleName']
-> Ghc [(ModSummary, TypecheckedModule)]
processModules modules = do
mg <- depAnalysis
let sortedMods = flattenSCCs $ topSortModuleGraph False mg Nothing
mapM (\x -> return (\y -> (x,y)) `ap`
(parseModule x >>= typecheckModule >>= loadModule))
sortedMods
where
depAnalysis :: Ghc ModuleGraph
depAnalysis = do
targets <- mapM (\f -> guessTarget f Nothing) modules
setTargets targets
depanal [] False
}}}
In this case, using the tiny module I posted at the beginning, I get:
{{{
*Main> :main "/tmp/J.hs"
/tmp/J.hs: Just class J.A a where
J.f, J.i, J.h, J.g :: a -> ()
}}}
It looks to me like it's just an oversight somewhere in the API and should
be an easy fix for someone familiar with that part. I'd rather save myself
many hours trying to find it on my own.
PS: Are the rules for when grouping happens documented somewhere? Grouping
functions in class definitions is the only sure-fire way I can get a
grouped signature but I'm sure there were others in the past that no
longer work.
--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8945>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
#8953: Inner Thigh Slimming Exercises for Women
------------------------------------+-------------------------------------
Reporter: szxdai1 | 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: |
------------------------------------+-------------------------------------
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--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8953>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
#8950: Online Slimming Help - How To Lose Weight
------------------------------------+-------------------------------------
Reporter: sdvsdv1 | 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: |
------------------------------------+-------------------------------------
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--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8950>
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The Glasgow Haskell Compiler
#8949: The New Slim in 6 Diet
------------------------------------+-------------------------------------
Reporter: sdvsdv1 | 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: |
------------------------------------+-------------------------------------
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--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8949>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
#8948: What Is The Fastest Way
------------------------------------+-------------------------------------
Reporter: sqcbybeddly1 | 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: |
------------------------------------+-------------------------------------
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--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8948>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
#7066: isInstance does not work for compound types
-------------------------------------+------------------------------------
Reporter: edsko | Owner: simonpj
Type: bug | Status: new
Priority: normal | Milestone: 7.8.1
Component: Template Haskell | Version: 7.4.2
Resolution: | Keywords:
Operating System: Unknown/Multiple | Architecture: Unknown/Multiple
Type of failure: None/Unknown | Difficulty: Unknown
Test Case: | Blocked By:
Blocking: | Related Tickets:
-------------------------------------+------------------------------------
Comment (by mojojojo):
I've just released "fixed" versions of {{{reifyInstances}}} and
{{{isInstance}}} as the [http://hackage.haskell.org/package/th-instance-
reification th-instance-reification library], which work as edsko and I
expected.
--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/7066#comment:9>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
#7066: isInstance does not work for compound types
-------------------------------------+------------------------------------
Reporter: edsko | Owner: simonpj
Type: bug | Status: new
Priority: normal | Milestone: 7.8.1
Component: Template Haskell | Version: 7.4.2
Resolution: | Keywords:
Operating System: Unknown/Multiple | Architecture: Unknown/Multiple
Type of failure: None/Unknown | Difficulty: Unknown
Test Case: | Blocked By:
Blocking: | Related Tickets:
-------------------------------------+------------------------------------
Comment (by mojojojo):
I just got hit by this issue.
I would expect
{{{
isInstance clss typs
}}}
to return True if and only if I can safely generate code (in my
Template Haskell code) that relies on 'typs' being an instance of 'clss'.
In the example above, I can not safely generate code that relies on a Show
instance for (Int, A) because there is no Show instance for A.
I expected exactly the same. That's why I believe that the current
behaviour of the function is unintuitive to say the least. The
documentation has no info concerning such behaviour either.
--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/7066#comment:8>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
