March 2019 - ghc-tickets

[GHC] #16287: :kind accepts bogus type
by GHC 04 Mar '19

04 Mar '19

#16287: :kind accepts bogus type -------------------------------------+------------------------------------- Reporter: simonpj | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.6.3 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: -------------------------------------+------------------------------------- Consider this (current HEAD) {{{ ghci> type family F :: k ghci> data T :: (forall k. k) -> Type ghci> :kind T F T F :: * }}} This is bogus. `F` has arity 1, and cannot appear unsaturated. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/16287> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #16248: ImplicitParams does not imply FlexibleContexts or FlexibleInstances
by GHC 04 Mar '19

04 Mar '19

#16248: ImplicitParams does not imply FlexibleContexts or FlexibleInstances -------------------------------------+------------------------------------- Reporter: NeilMitchell | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Documentation | Version: 8.6.3 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: -------------------------------------+------------------------------------- Given: {{{#!hs {-# LANGUAGE ImplicitParams #-} {-# LANGUAGE FlexibleInstances #-} module Test where data X a = X type XI = X Int class Foo a where foo :: (?p :: Int) => a -> Int instance Foo XI where foo = undefined }}} This code compiles. However, the documentation at https://downloads.haskell.org/~ghc/master/users-guide/glasgow_exts.html #language-options says that ImplicitParams implies FlexibleInstances, so we should be able to remove the FlexibleInstances extension. However, doing so makes it stop compiling. My guess is that ImplicitParams doesn't really imply either of the type class extensions, and that the documentation is buggy. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/16248> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #16128: Pattern match checker should shortcut on simple cases
by GHC 04 Mar '19

04 Mar '19

#16128: Pattern match checker should shortcut on simple cases -------------------------------------+------------------------------------- Reporter: gbaz | Owner: (none) Type: feature | Status: new request | Priority: normal | Milestone: Component: Compiler | Version: 8.6.3 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'm autogenerating with TH some code that does a giant string pattern match on up to 60 cases. This match clause includes a default case, but nonetheless I get a warning: Pattern match checker exceeded (2000000) iterations in a case alternative. (Use -fmax-pmcheck-iterations=n to set the maximun number of iterations to n) Note that in my case all the strings share a great deal in their common prefixes, which probably doesn't help matters. It seems to me that in a case like this, GHC should be able to just check that there are no duplicate strings (i.e. no overlaps) and that there is a default case (i.e. no incompleteness) rather than running the full checker algo. I'm not quite sure if there's a good way to generalize such a proposed shortcut so it is not too much of a special case, but likely something could be done? -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/16128> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #16236: API Annotations: AnnAt disconnected for TYPEAPP
by GHC 04 Mar '19

04 Mar '19

#16236: API Annotations: AnnAt disconnected for TYPEAPP -------------------------------------+------------------------------------- Reporter: alanz | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: 8.8.1 Component: Compiler | Version: 8.6.3 (Parser) | Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: Incorrect API Unknown/Multiple | annotation Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- For the code {{{#!hs type family F1 (a :: k) (f :: k -> Type) :: Type where F1 @Peano a f = T @Peano f a }}} the API annotation for the first `@` is not attached to a `SourcSpan` in the `ParsedSource` -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/16236> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #16279: Lexer: Alternate Layout Rule injects actual not virtual braces
by GHC 04 Mar '19

04 Mar '19

#16279: Lexer: Alternate Layout Rule injects actual not virtual braces -------------------------------------+------------------------------------- Reporter: alanz | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.6.3 (Parser) | Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: Incorrect API Unknown/Multiple | annotation Test Case: | Blocked By: Blocking: | Related Tickets: #13807 Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- When the alternate layout rule is activated via a pragma, it injects tokens for `{` and `}` to make sure that the source is parsed properly. But it injects `ITocurly` and `ITccurly`, rather than their virtual counterparts `ITvocurly` and `ITvccurly`. This causes problems for `ghc-exactprint`, which tries to print these. Test case (the existing T13087.hs) {{{#!hs {-# LANGUAGE AlternativeLayoutRule #-} {-# LANGUAGE LambdaCase #-} isOne :: Int -> Bool isOne = \case 1 -> True _ -> False main = return () }}} -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/16279> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #16265: API Annotations: parens anns discarded for `(*)` operator
by GHC 04 Mar '19

04 Mar '19

#16265: API Annotations: parens anns discarded for `(*)` operator -------------------------------------+------------------------------------- Reporter: alanz | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: 8.8.1 Component: Compiler | Version: 8.6.3 (Parser) | Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: Incorrect API Unknown/Multiple | annotation Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- The patch from https://phabricator.haskell.org/D4865 introduces {{{#!hs go _ (HsParTy _ (dL->L l (HsStarTy _ isUni))) acc ann fix = do { warnStarBndr l ; let name = mkOccName tcClsName (if isUni then "★" else "*") ; return (cL l (Unqual name), acc, fix, ann) } }}} which discards the parens annotations belonging to the `HsParTy`. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/16265> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #16239: hadrian fails to "build" _build/docs/html/libraries/base/base.haddock
by GHC 04 Mar '19

04 Mar '19

#16239: hadrian fails to "build" _build/docs/html/libraries/base/base.haddock -------------------------------------+------------------------------------- Reporter: alpmestan | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Build System | Version: 8.7 (Hadrian) | 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: -------------------------------------+------------------------------------- {{{ #!sh # running: build -V _validate-bug/docs/html/libraries/base/base.haddock | Run Haddock BuildPackage: libraries/base/Control/Applicative.hs (and 236 more) => _validate-bug/docs/html/libraries/base/base.haddock _validate-bug/stage1/bin/haddock --verbosity=0 -B_validate-bug/stage1/lib --lib=_validate-bug/stage1/lib --odir=_validate- bug/docs/html/libraries/base --no-tmp-comp-dir --dump-interface=_validate- bug/docs/html/libraries/base/base.haddock --html --hyperlinked-source --hoogle --quickjump '--title=base-4.12.0.0: Basic libraries' --prologue =_validate-bug/docs/html/libraries/base/haddock-prologue.txt --optghc=-D__HADDOCK_VERSION__=2220 --hide=Control.Monad.ST.Imp --hide=Control.Monad.ST.Lazy.Imp --hide=Data.Functor.Utils --hide=Data.OldList --hide=Data.Semigroup.Internal --hide=Data.Typeable.Internal --hide=Foreign.ForeignPtr.Imp --hide=GHC.StaticPtr.Internal --hide=System.Environment.ExecutablePath --hide=System.CPUTime.Utils --hide=GHC.Event.Arr --hide=GHC.Event.Array --hide=GHC.Event.Control --hide=GHC.Event.EPoll --hide=GHC.Event.IntTable --hide=GHC.Event.Internal --hide=GHC.Event.KQueue --hide=GHC.Event.Manager --hide=GHC.Event.PSQ --hide=GHC.Event.Poll --hide=GHC.Event.Thread --hide=GHC.Event.TimerManager --hide=GHC.Event.Unique --hide=System.CPUTime.Posix.ClockGetTime --hide=System.CPUTime.Posix.Times --hide=System.CPUTime.Posix.RUsage --hide=System.CPUTime.Unsupported --read-interface=../ghc-prim,../ghc-prim/src/%{MODULE}.html#%{NAME },_validate-bug/docs/html/libraries/ghc-prim/ghc-prim.haddock --read- interface=../integer-gmp,../integer-gmp/src/%{MODULE}.html#%{NAME },_validate-bug/docs/html/libraries/integer-gmp/integer-gmp.haddock --optghc=-hisuf --optghc=dyn_hi --optghc=-osuf --optghc=dyn_o --optghc=-hcsuf --optghc=dyn_hc --optghc=-fPIC --optghc=-dynamic --optghc =-hide-all-packages --optghc=-no-user-package-db '--optghc=-this-unit-id base-4.12.0.0' '--optghc=-package-id ghc-prim-0.5.3' '--optghc=-package-id integer-gmp-1.0.2.0' '--optghc=-package-id rts-1.0' --optghc=-i --optghc =-i_validate-bug/stage1/libraries/base/build --optghc=-i_validate- bug/stage1/libraries/base/build/autogen --optghc=-ilibraries/base/. --optghc=-Iincludes --optghc=-I_validate-bug/generated --optghc =-I_validate-bug/stage1/libraries/base/build --optghc=-I/nix/store /jxaaf8dsrb16vnwnij69jar7mhhj969q-ghc-build-environment/include --optghc =-I_validate-bug/stage1/libraries/base/build/include --optghc=-Ilibraries/base/include --optghc=-I/nix/store /jxaaf8dsrb16vnwnij69jar7mhhj969q-ghc-build-environment/include --optghc=-I/home/alp/WT/ghc-gitlab/_validate-bug/stage1/lib/x86_64-linux- ghc-8.7.20190123/integer-gmp-1.0.2.0/include --optghc=-I/home/alp/WT/ghc- gitlab/_validate-bug/stage1/lib/x86_64-linux- ghc-8.7.20190123/rts-1.0/include --optghc=-I_validate-bug/generated --optghc=-optc-I_validate-bug/generated --optghc=-optP-include --optghc =-optP_validate-bug/stage1/libraries/base/build/autogen/cabal_macros.h --optghc=-outputdir --optghc=_validate-bug/stage1/libraries/base/build --optghc=-this-unit-id --optghc=base --optghc=-Wcompat --optghc =-Wnoncanonical-monad-instances --optghc=-XHaskell2010 --optghc =-ghcversion-file=/home/alp/WT/ghc-gitlab/_validate- bug/generated/ghcversion.h --optghc=-Wno-deprecated-flags --optghc=-Wno- trustworthy-safe libraries/base/Control/Applicative.hs libraries/base/Control/Arrow.hs libraries/base/Control/Category.hs libraries/base/Control/Concurrent.hs libraries/base/Control/Concurrent/Chan.hs libraries/base/Control/Concurrent/MVar.hs libraries/base/Control/Concurrent/QSem.hs libraries/base/Control/Concurrent/QSemN.hs libraries/base/Control/Exception.hs libraries/base/Control/Exception/Base.hs libraries/base/Control/Monad.hs libraries/base/Control/Monad/Fail.hs libraries/base/Control/Monad/Fix.hs libraries/base/Control/Monad/IO/Class.hs libraries/base/Control/Monad/Instances.hs libraries/base/Control/Monad/ST.hs libraries/base/Control/Monad/ST/Imp.hs libraries/base/Control/Monad/ST/Lazy.hs libraries/base/Control/Monad/ST/Lazy/Imp.hs libraries/base/Control/Monad/ST/Lazy/Safe.hs libraries/base/Control/Monad/ST/Lazy/Unsafe.hs libraries/base/Control/Monad/ST/Safe.hs libraries/base/Control/Monad/ST/Strict.hs libraries/base/Control/Monad/ST/Unsafe.hs libraries/base/Control/Monad/Zip.hs libraries/base/Data/Bifoldable.hs libraries/base/Data/Bifunctor.hs libraries/base/Data/Bitraversable.hs libraries/base/Data/Bits.hs libraries/base/Data/Bool.hs libraries/base/Data/Char.hs libraries/base/Data/Coerce.hs libraries/base/Data/Complex.hs libraries/base/Data/Data.hs libraries/base/Data/Dynamic.hs libraries/base/Data/Either.hs libraries/base/Data/Eq.hs libraries/base/Data/Fixed.hs libraries/base/Data/Foldable.hs libraries/base/Data/Function.hs libraries/base/Data/Functor.hs libraries/base/Data/Functor/Classes.hs libraries/base/Data/Functor/Compose.hs libraries/base/Data/Functor/Const.hs libraries/base/Data/Functor/Contravariant.hs libraries/base/Data/Functor/Identity.hs libraries/base/Data/Functor/Product.hs libraries/base/Data/Functor/Sum.hs libraries/base/Data/Functor/Utils.hs libraries/base/Data/IORef.hs libraries/base/Data/Int.hs libraries/base/Data/Ix.hs libraries/base/Data/Kind.hs libraries/base/Data/List.hs libraries/base/Data/List/NonEmpty.hs libraries/base/Data/Maybe.hs libraries/base/Data/Monoid.hs libraries/base/Data/OldList.hs libraries/base/Data/Ord.hs libraries/base/Data/Proxy.hs libraries/base/Data/Ratio.hs libraries/base/Data/STRef.hs libraries/base/Data/STRef/Lazy.hs libraries/base/Data/STRef/Strict.hs libraries/base/Data/Semigroup.hs libraries/base/Data/Semigroup/Internal.hs libraries/base/Data/String.hs libraries/base/Data/Traversable.hs libraries/base/Data/Tuple.hs libraries/base/Data/Type/Bool.hs libraries/base/Data/Type/Coercion.hs libraries/base/Data/Type/Equality.hs libraries/base/Data/Typeable.hs libraries/base/Data/Typeable/Internal.hs libraries/base/Data/Unique.hs libraries/base/Data/Version.hs libraries/base/Data/Void.hs libraries/base/Data/Word.hs libraries/base/Debug/Trace.hs libraries/base/Foreign.hs libraries/base/Foreign/C.hs libraries/base/Foreign/C/Error.hs libraries/base/Foreign/C/String.hs libraries/base/Foreign/C/Types.hs libraries/base/Foreign/Concurrent.hs libraries/base/Foreign/ForeignPtr.hs libraries/base/Foreign/ForeignPtr/Imp.hs libraries/base/Foreign/ForeignPtr/Safe.hs libraries/base/Foreign/ForeignPtr/Unsafe.hs libraries/base/Foreign/Marshal.hs libraries/base/Foreign/Marshal/Alloc.hs libraries/base/Foreign/Marshal/Array.hs libraries/base/Foreign/Marshal/Error.hs libraries/base/Foreign/Marshal/Pool.hs libraries/base/Foreign/Marshal/Safe.hs libraries/base/Foreign/Marshal/Unsafe.hs libraries/base/Foreign/Marshal/Utils.hs libraries/base/Foreign/Ptr.hs libraries/base/Foreign/Safe.hs libraries/base/Foreign/StablePtr.hs libraries/base/Foreign/Storable.hs libraries/base/GHC/Arr.hs libraries/base/GHC/Base.hs libraries/base/GHC/ByteOrder.hs libraries/base/GHC/Char.hs _validate- bug/stage1/libraries/base/build/GHC/Clock.hs libraries/base/GHC/Conc.hs libraries/base/GHC/Conc/IO.hs libraries/base/GHC/Conc/Signal.hs libraries/base/GHC/Conc/Sync.hs libraries/base/GHC/ConsoleHandler.hs libraries/base/GHC/Constants.hs libraries/base/GHC/Desugar.hs libraries/base/GHC/Enum.hs libraries/base/GHC/Environment.hs libraries/base/GHC/Err.hs libraries/base/GHC/Event.hs libraries/base/GHC/Event/Arr.hs libraries/base/GHC/Event/Array.hs libraries/base/GHC/Event/Control.hs _validate- bug/stage1/libraries/base/build/GHC/Event/EPoll.hs libraries/base/GHC/Event/IntTable.hs libraries/base/GHC/Event/Internal.hs _validate-bug/stage1/libraries/base/build/GHC/Event/KQueue.hs libraries/base/GHC/Event/Manager.hs libraries/base/GHC/Event/PSQ.hs _validate-bug/stage1/libraries/base/build/GHC/Event/Poll.hs libraries/base/GHC/Event/Thread.hs libraries/base/GHC/Event/TimerManager.hs libraries/base/GHC/Event/Unique.hs libraries/base/GHC/Exception.hs libraries/base/GHC/Exception/Type.hs libraries/base/GHC/ExecutionStack.hs _validate-bug/stage1/libraries/base/build/GHC/ExecutionStack/Internal.hs libraries/base/GHC/Exts.hs libraries/base/GHC/Fingerprint.hs libraries/base/GHC/Fingerprint/Type.hs libraries/base/GHC/Float.hs libraries/base/GHC/Float/ConversionUtils.hs libraries/base/GHC/Float/RealFracMethods.hs libraries/base/GHC/Foreign.hs libraries/base/GHC/ForeignPtr.hs libraries/base/GHC/GHCi.hs libraries/base/GHC/Generics.hs libraries/base/GHC/IO.hs libraries/base/GHC/IO/Buffer.hs libraries/base/GHC/IO/BufferedIO.hs libraries/base/GHC/IO/Device.hs libraries/base/GHC/IO/Encoding.hs libraries/base/GHC/IO/Encoding/CodePage.hs libraries/base/GHC/IO/Encoding/Failure.hs libraries/base/GHC/IO/Encoding/Iconv.hs libraries/base/GHC/IO/Encoding/Latin1.hs libraries/base/GHC/IO/Encoding/Types.hs libraries/base/GHC/IO/Encoding/UTF16.hs libraries/base/GHC/IO/Encoding/UTF32.hs libraries/base/GHC/IO/Encoding/UTF8.hs libraries/base/GHC/IO/Exception.hs libraries/base/GHC/IO/FD.hs libraries/base/GHC/IO/Handle.hs libraries/base/GHC/IO/Handle/FD.hs libraries/base/GHC/IO/Handle/Internals.hs _validate- bug/stage1/libraries/base/build/GHC/IO/Handle/Lock.hs libraries/base/GHC/IO/Handle/Text.hs libraries/base/GHC/IO/Handle/Types.hs libraries/base/GHC/IO/IOMode.hs libraries/base/GHC/IO/Unsafe.hs libraries/base/GHC/IOArray.hs libraries/base/GHC/IORef.hs libraries/base/GHC/Int.hs libraries/base/GHC/List.hs libraries/base/GHC/MVar.hs libraries/base/GHC/Maybe.hs libraries/base/GHC/Natural.hs libraries/base/GHC/Num.hs libraries/base/GHC/OldList.hs libraries/base/GHC/OverloadedLabels.hs libraries/base/GHC/Pack.hs libraries/base/GHC/Profiling.hs libraries/base/GHC/Ptr.hs _validate- bug/stage1/libraries/base/build/GHC/RTS/Flags.hs libraries/base/GHC/Read.hs libraries/base/GHC/Real.hs libraries/base/GHC/Records.hs libraries/base/GHC/ResponseFile.hs libraries/base/GHC/ST.hs libraries/base/GHC/STRef.hs libraries/base/GHC/Show.hs libraries/base/GHC/Stable.hs libraries/base/GHC/StableName.hs libraries/base/GHC/Stack.hs _validate- bug/stage1/libraries/base/build/GHC/Stack/CCS.hs libraries/base/GHC/Stack/Types.hs libraries/base/GHC/StaticPtr.hs libraries/base/GHC/StaticPtr/Internal.hs _validate- bug/stage1/libraries/base/build/GHC/Stats.hs libraries/base/GHC/Storable.hs libraries/base/GHC/TopHandler.hs libraries/base/GHC/TypeLits.hs libraries/base/GHC/TypeNats.hs libraries/base/GHC/Unicode.hs libraries/base/GHC/Weak.hs libraries/base/GHC/Word.hs libraries/base/Numeric.hs libraries/base/Numeric/Natural.hs libraries/base/Prelude.hs _validate- bug/stage1/libraries/base/build/System/CPUTime.hs _validate- bug/stage1/libraries/base/build/System/CPUTime/Posix/ClockGetTime.hs _validate-bug/stage1/libraries/base/build/System/CPUTime/Posix/RUsage.hs _validate-bug/stage1/libraries/base/build/System/CPUTime/Posix/Times.hs libraries/base/System/CPUTime/Unsupported.hs libraries/base/System/CPUTime/Utils.hs libraries/base/System/Console/GetOpt.hs libraries/base/System/Environment.hs _validate- bug/stage1/libraries/base/build/System/Environment/Blank.hs _validate- bug/stage1/libraries/base/build/System/Environment/ExecutablePath.hs libraries/base/System/Exit.hs libraries/base/System/IO.hs libraries/base/System/IO/Error.hs libraries/base/System/IO/Unsafe.hs libraries/base/System/Info.hs libraries/base/System/Mem.hs libraries/base/System/Mem/StableName.hs libraries/base/System/Mem/Weak.hs libraries/base/System/Posix/Internals.hs libraries/base/System/Posix/Types.hs libraries/base/System/Timeout.hs libraries/base/Text/ParserCombinators/ReadP.hs libraries/base/Text/ParserCombinators/ReadPrec.hs libraries/base/Text/Printf.hs libraries/base/Text/Read.hs libraries/base/Text/Read/Lex.hs libraries/base/Text/Show.hs libraries/base/Text/Show/Functions.hs libraries/base/Type/Reflection.hs libraries/base/Type/Reflection/Unsafe.hs libraries/base/Unsafe/Coerce.hs +RTS -t_validate-bug/stage1/libraries/base/build/haddock.t --machine- readable -RTS Warning: 'UAddr' is ambiguous. It is defined * at libraries/base/GHC/Generics.hs:1025:40 * at libraries/base/GHC/Generics.hs:1094:1 You may be able to disambiguate the identifier by qualifying it or by hiding some imports. Defaulting to 'UAddr' defined at libraries/base/GHC/Generics.hs:1094:1 Warning: 'UChar' is ambiguous. It is defined * at libraries/base/GHC/Generics.hs:1036:36 * at libraries/base/GHC/Generics.hs:1098:1 You may be able to disambiguate the identifier by qualifying it or by hiding some imports. Defaulting to 'UChar' defined at libraries/base/GHC/Generics.hs:1098:1 Warning: 'UDouble' is ambiguous. It is defined * at libraries/base/GHC/Generics.hs:1048:38 * at libraries/base/GHC/Generics.hs:1103:1 You may be able to disambiguate the identifier by qualifying it or by hiding some imports. Defaulting to 'UDouble' defined at libraries/base/GHC/Generics.hs:1103:1 Warning: 'UFloat' is ambiguous. It is defined * at libraries/base/GHC/Generics.hs:1060:37 * at libraries/base/GHC/Generics.hs:1108:1 You may be able to disambiguate the identifier by qualifying it or by hiding some imports. Defaulting to 'UFloat' defined at libraries/base/GHC/Generics.hs:1108:1 Warning: 'UInt' is ambiguous. It is defined * at libraries/base/GHC/Generics.hs:1070:35 * at libraries/base/GHC/Generics.hs:1113:1 You may be able to disambiguate the identifier by qualifying it or by hiding some imports. Defaulting to 'UInt' defined at libraries/base/GHC/Generics.hs:1113:1 Warning: 'UWord' is ambiguous. It is defined * at libraries/base/GHC/Generics.hs:1082:36 * at libraries/base/GHC/Generics.hs:1118:1 You may be able to disambiguate the identifier by qualifying it or by hiding some imports. Defaulting to 'UWord' defined at libraries/base/GHC/Generics.hs:1118:1 Warning: 'IOError' is ambiguous. It is defined * at libraries/base/GHC/IO/Exception.hs:331:4 * at libraries/base/GHC/IO/Exception.hs:324:1 You may be able to disambiguate the identifier by qualifying it or by hiding some imports. Defaulting to 'IOError' defined at libraries/base/GHC/IO/Exception.hs:330:1 Warning: 'IOError' is ambiguous. It is defined * at libraries/base/GHC/IO/Exception.hs:331:4 * at libraries/base/GHC/IO/Exception.hs:324:1 You may be able to disambiguate the identifier by qualifying it or by hiding some imports. Defaulting to 'IOError' defined at libraries/base/GHC/IO/Exception.hs:330:1 Warning: 'IOError' is ambiguous. It is defined * at libraries/base/GHC/IO/Exception.hs:331:4 * at libraries/base/GHC/IO/Exception.hs:324:1 You may be able to disambiguate the identifier by qualifying it or by hiding some imports. Defaulting to 'IOError' defined at libraries/base/GHC/IO/Exception.hs:330:1 Warning: 'flock' is out of scope. If you qualify the identifier, haddock can try to link it anyway. Warning: 'LockFileEx' is out of scope. If you qualify the identifier, haddock can try to link it anyway. Warning: 'FileLockingNotImplemented' is out of scope. If you qualify the identifier, haddock can try to link it anyway. Warning: 'IOError' is ambiguous. It is defined * at libraries/base/GHC/IO/Exception.hs:331:4 * at libraries/base/GHC/IO/Exception.hs:324:1 You may be able to disambiguate the identifier by qualifying it or by hiding some imports. Defaulting to 'IOError' defined at libraries/base/GHC/IO/Exception.hs:330:1 Warning: 'ExitException' is out of scope. If you qualify the identifier, haddock can try to link it anyway. Warning: 'mtimes' is out of scope. If you qualify the identifier, haddock can try to link it anyway. Warning: GHC.Word: could not find link destinations for: D:R:UReckWordp0 Warning: GHC.Float: could not find link destinations for: D:R:UReckFloatp0 D:R:UReckDoublep0 Warning: Text.Read.Lex: could not find link destinations for: guard Warning: GHC.Ptr: could not find link destinations for: D:R:UReckPtrp0 Warning: GHC.Int: could not find link destinations for: D:R:UReckIntp0 Warning: Data.Int: could not find link destinations for: D:R:UReckIntp0 Warning: Foreign.Ptr: could not find link destinations for: D:R:UReckPtrp0 Warning: Data.Word: could not find link destinations for: D:R:UReckWordp0 Warning: Data.Type.Equality: could not find link destinations for: ~# Warning: Data.Char: could not find link destinations for: D:R:UReckCharp0 Warning: GHC.TypeNats: could not find link destinations for: natSing Warning: GHC.TypeLits: could not find link destinations for: natSing symbolSing Warning: GHC.Generics: could not find link destinations for: D:R:UReckWordp0 D:R:UReckIntp0 D:R:UReckFloatp0 D:R:UReckDoublep0 D:R:UReckCharp0 D:R:UReckPtrp0 SingI SingKind Warning: Type.Reflection: could not find link destinations for: typeRep# IsApplication Warning: Data.Typeable: could not find link destinations for: typeRep# Warning: GHC.IO: could not find link destinations for: hspr UPrintf spr Warning: GHC.ForeignPtr: could not find link destinations for: Finalizers Warning: GHC.Foreign: could not find link destinations for: CString CStringLen Warning: Data.Dynamic: could not find link destinations for: typeRep# Warning: System.IO: could not find link destinations for: hspr UPrintf spr Warning: Prelude: could not find link destinations for: D:R:UReckCharp0 D:R:UReckIntp0 D:R:UReckFloatp0 D:R:UReckDoublep0 D:R:UReckWordp0 hspr UPrintf spr Warning: Text.Printf: could not find link destinations for: spr UPrintf hspr Warning: GHC.ExecutionStack.Internal: could not find link destinations for: locationSize Warning: GHC.Exts: could not find link destinations for: D:R:UReckIntp0 D:R:UReckWordp0 D:R:UReckFloatp0 D:R:UReckDoublep0 D:R:UReckCharp0 D:R:UReckPtrp0 ~# shakeArgsWith 0.000s 0% Function shake 0.005s 0% Database read 0.479s 0% With database 0.037s 0% Running rules 62.764s 99% ========================= Total 63.285s 100% Error when running Shake build system: at src/Main.hs:58:30-42: * Depends on: _validate-bug/docs/html/libraries/base/base.haddock * Raised the exception: user error (Development.Shake.cmd, system command failed Command: _validate-bug/stage1/bin/haddock --verbosity=0 -B_validate- bug/stage1/lib --lib=_validate-bug/stage1/lib --odir=_validate- bug/docs/html/libraries/base --no-tmp-comp-dir --dump-interface=_validate- bug/docs/html/libraries/base/base.haddock --html --hyperlinked-source --hoogle --quickjump '--title=base-4.12.0.0: Basic libraries' --prologue =_validate-bug/docs/html/libraries/base/haddock-prologue.txt --optghc=-D__HADDOCK_VERSION__=2220 --hide=Control.Monad.ST.Imp --hide=Control.Monad.ST.Lazy.Imp --hide=Data.Functor.Utils --hide=Data.OldList --hide=Data.Semigroup.Internal --hide=Data.Typeable.Internal --hide=Foreign.ForeignPtr.Imp --hide=GHC.StaticPtr.Internal --hide=System.Environment.ExecutablePath --hide=System.CPUTime.Utils --hide=GHC.Event.Arr --hide=GHC.Event.Array --hide=GHC.Event.Control --hide=GHC.Event.EPoll --hide=GHC.Event.IntTable --hide=GHC.Event.Internal --hide=GHC.Event.KQueue --hide=GHC.Event.Manager --hide=GHC.Event.PSQ --hide=GHC.Event.Poll --hide=GHC.Event.Thread --hide=GHC.Event.TimerManager --hide=GHC.Event.Unique --hide=System.CPUTime.Posix.ClockGetTime --hide=System.CPUTime.Posix.Times --hide=System.CPUTime.Posix.RUsage --hide=System.CPUTime.Unsupported --read-interface=../ghc-prim,../ghc-prim/src/%{MODULE}.html#%{NAME },_validate-bug/docs/html/libraries/ghc-prim/ghc-prim.haddock --read- interface=../integer-gmp,../integer-gmp/src/%{MODULE}.html#%{NAME },_validate-bug/docs/html/libraries/integer-gmp/integer-gmp.haddock --optghc=-hisuf --optghc=dyn_hi --optghc=-osuf --optghc=dyn_o --optghc=-hcsuf --optghc=dyn_hc --optghc=-fPIC --optghc=-dynamic --optghc =-hide-all-packages --optghc=-no-user-package-db '--optghc=-this-unit-id base-4.12.0.0' '--optghc=-package-id ghc-prim-0.5.3' '--optghc=-package-id integer-gmp-1.0.2.0' '--optghc=-package-id rts-1.0' --optghc=-i --optghc =-i_validate-bug/stage1/libraries/base/build --optghc=-i_validate- bug/stage1/libraries/base/build/autogen --optghc=-ilibraries/base/. --optghc=-Iincludes --optghc=-I_validate-bug/generated --optghc =-I_validate-bug/stage1/libraries/base/build --optghc=-I/nix/store /jxaaf8dsrb16vnwnij69jar7mhhj969q-ghc-build-environment/include --optghc =-I_validate-bug/stage1/libraries/base/build/include --optghc=-Ilibraries/base/include --optghc=-I/nix/store /jxaaf8dsrb16vnwnij69jar7mhhj969q-ghc-build-environment/include --optghc=-I/home/alp/WT/ghc-gitlab/_validate-bug/stage1/lib/x86_64-linux- ghc-8.7.20190123/integer-gmp-1.0.2.0/include --optghc=-I/home/alp/WT/ghc- gitlab/_validate-bug/stage1/lib/x86_64-linux- ghc-8.7.20190123/rts-1.0/include --optghc=-I_validate-bug/generated --optghc=-optc-I_validate-bug/generated --optghc=-optP-include --optghc =-optP_validate-bug/stage1/libraries/base/build/autogen/cabal_macros.h --optghc=-outputdir --optghc=_validate-bug/stage1/libraries/base/build --optghc=-this-unit-id --optghc=base --optghc=-Wcompat --optghc =-Wnoncanonical-monad-instances --optghc=-XHaskell2010 --optghc =-ghcversion-file=/home/alp/WT/ghc-gitlab/_validate- bug/generated/ghcversion.h --optghc=-Wno-deprecated-flags --optghc=-Wno- trustworthy-safe libraries/base/Control/Applicative.hs libraries/base/Control/Arrow.hs libraries/base/Control/Category.hs libraries/base/Control/Concurrent.hs libraries/base/Control/Concurrent/Chan.hs libraries/base/Control/Concurrent/MVar.hs libraries/base/Control/Concurrent/QSem.hs libraries/base/Control/Concurrent/QSemN.hs libraries/base/Control/Exception.hs libraries/base/Control/Exception/Base.hs libraries/base/Control/Monad.hs libraries/base/Control/Monad/Fail.hs libraries/base/Control/Monad/Fix.hs libraries/base/Control/Monad/IO/Class.hs libraries/base/Control/Monad/Instances.hs libraries/base/Control/Monad/ST.hs libraries/base/Control/Monad/ST/Imp.hs libraries/base/Control/Monad/ST/Lazy.hs libraries/base/Control/Monad/ST/Lazy/Imp.hs libraries/base/Control/Monad/ST/Lazy/Safe.hs libraries/base/Control/Monad/ST/Lazy/Unsafe.hs libraries/base/Control/Monad/ST/Safe.hs libraries/base/Control/Monad/ST/Strict.hs libraries/base/Control/Monad/ST/Unsafe.hs libraries/base/Control/Monad/Zip.hs libraries/base/Data/Bifoldable.hs libraries/base/Data/Bifunctor.hs libraries/base/Data/Bitraversable.hs libraries/base/Data/Bits.hs libraries/base/Data/Bool.hs libraries/base/Data/Char.hs libraries/base/Data/Coerce.hs libraries/base/Data/Complex.hs libraries/base/Data/Data.hs libraries/base/Data/Dynamic.hs libraries/base/Data/Either.hs libraries/base/Data/Eq.hs libraries/base/Data/Fixed.hs libraries/base/Data/Foldable.hs libraries/base/Data/Function.hs libraries/base/Data/Functor.hs libraries/base/Data/Functor/Classes.hs libraries/base/Data/Functor/Compose.hs libraries/base/Data/Functor/Const.hs libraries/base/Data/Functor/Contravariant.hs libraries/base/Data/Functor/Identity.hs libraries/base/Data/Functor/Product.hs libraries/base/Data/Functor/Sum.hs libraries/base/Data/Functor/Utils.hs libraries/base/Data/IORef.hs libraries/base/Data/Int.hs libraries/base/Data/Ix.hs libraries/base/Data/Kind.hs libraries/base/Data/List.hs libraries/base/Data/List/NonEmpty.hs libraries/base/Data/Maybe.hs libraries/base/Data/Monoid.hs libraries/base/Data/OldList.hs libraries/base/Data/Ord.hs libraries/base/Data/Proxy.hs libraries/base/Data/Ratio.hs libraries/base/Data/STRef.hs libraries/base/Data/STRef/Lazy.hs libraries/base/Data/STRef/Strict.hs libraries/base/Data/Semigroup.hs libraries/base/Data/Semigroup/Internal.hs libraries/base/Data/String.hs libraries/base/Data/Traversable.hs libraries/base/Data/Tuple.hs libraries/base/Data/Type/Bool.hs libraries/base/Data/Type/Coercion.hs libraries/base/Data/Type/Equality.hs libraries/base/Data/Typeable.hs libraries/base/Data/Typeable/Internal.hs libraries/base/Data/Unique.hs libraries/base/Data/Version.hs libraries/base/Data/Void.hs libraries/base/Data/Word.hs libraries/base/Debug/Trace.hs libraries/base/Foreign.hs libraries/base/Foreign/C.hs libraries/base/Foreign/C/Error.hs libraries/base/Foreign/C/String.hs libraries/base/Foreign/C/Types.hs libraries/base/Foreign/Concurrent.hs libraries/base/Foreign/ForeignPtr.hs libraries/base/Foreign/ForeignPtr/Imp.hs libraries/base/Foreign/ForeignPtr/Safe.hs libraries/base/Foreign/ForeignPtr/Unsafe.hs libraries/base/Foreign/Marshal.hs libraries/base/Foreign/Marshal/Alloc.hs libraries/base/Foreign/Marshal/Array.hs libraries/base/Foreign/Marshal/Error.hs libraries/base/Foreign/Marshal/Pool.hs libraries/base/Foreign/Marshal/Safe.hs libraries/base/Foreign/Marshal/Unsafe.hs libraries/base/Foreign/Marshal/Utils.hs libraries/base/Foreign/Ptr.hs libraries/base/Foreign/Safe.hs libraries/base/Foreign/StablePtr.hs libraries/base/Foreign/Storable.hs libraries/base/GHC/Arr.hs libraries/base/GHC/Base.hs libraries/base/GHC/ByteOrder.hs libraries/base/GHC/Char.hs _validate- bug/stage1/libraries/base/build/GHC/Clock.hs libraries/base/GHC/Conc.hs libraries/base/GHC/Conc/IO.hs libraries/base/GHC/Conc/Signal.hs libraries/base/GHC/Conc/Sync.hs libraries/base/GHC/ConsoleHandler.hs libraries/base/GHC/Constants.hs libraries/base/GHC/Desugar.hs libraries/base/GHC/Enum.hs libraries/base/GHC/Environment.hs libraries/base/GHC/Err.hs libraries/base/GHC/Event.hs libraries/base/GHC/Event/Arr.hs libraries/base/GHC/Event/Array.hs libraries/base/GHC/Event/Control.hs _validate- bug/stage1/libraries/base/build/GHC/Event/EPoll.hs libraries/base/GHC/Event/IntTable.hs libraries/base/GHC/Event/Internal.hs _validate-bug/stage1/libraries/base/build/GHC/Event/KQueue.hs libraries/base/GHC/Event/Manager.hs libraries/base/GHC/Event/PSQ.hs _validate-bug/stage1/libraries/base/build/GHC/Event/Poll.hs libraries/base/GHC/Event/Thread.hs libraries/base/GHC/Event/TimerManager.hs libraries/base/GHC/Event/Unique.hs libraries/base/GHC/Exception.hs libraries/base/GHC/Exception/Type.hs libraries/base/GHC/ExecutionStack.hs _validate-bug/stage1/libraries/base/build/GHC/ExecutionStack/Internal.hs libraries/base/GHC/Exts.hs libraries/base/GHC/Fingerprint.hs libraries/base/GHC/Fingerprint/Type.hs libraries/base/GHC/Float.hs libraries/base/GHC/Float/ConversionUtils.hs libraries/base/GHC/Float/RealFracMethods.hs libraries/base/GHC/Foreign.hs libraries/base/GHC/ForeignPtr.hs libraries/base/GHC/GHCi.hs libraries/base/GHC/Generics.hs libraries/base/GHC/IO.hs libraries/base/GHC/IO/Buffer.hs libraries/base/GHC/IO/BufferedIO.hs libraries/base/GHC/IO/Device.hs libraries/base/GHC/IO/Encoding.hs libraries/base/GHC/IO/Encoding/CodePage.hs libraries/base/GHC/IO/Encoding/Failure.hs libraries/base/GHC/IO/Encoding/Iconv.hs libraries/base/GHC/IO/Encoding/Latin1.hs libraries/base/GHC/IO/Encoding/Types.hs libraries/base/GHC/IO/Encoding/UTF16.hs libraries/base/GHC/IO/Encoding/UTF32.hs libraries/base/GHC/IO/Encoding/UTF8.hs libraries/base/GHC/IO/Exception.hs libraries/base/GHC/IO/FD.hs libraries/base/GHC/IO/Handle.hs libraries/base/GHC/IO/Handle/FD.hs libraries/base/GHC/IO/Handle/Internals.hs _validate- bug/stage1/libraries/base/build/GHC/IO/Handle/Lock.hs libraries/base/GHC/IO/Handle/Text.hs libraries/base/GHC/IO/Handle/Types.hs libraries/base/GHC/IO/IOMode.hs libraries/base/GHC/IO/Unsafe.hs libraries/base/GHC/IOArray.hs libraries/base/GHC/IORef.hs libraries/base/GHC/Int.hs libraries/base/GHC/List.hs libraries/base/GHC/MVar.hs libraries/base/GHC/Maybe.hs libraries/base/GHC/Natural.hs libraries/base/GHC/Num.hs libraries/base/GHC/OldList.hs libraries/base/GHC/OverloadedLabels.hs libraries/base/GHC/Pack.hs libraries/base/GHC/Profiling.hs libraries/base/GHC/Ptr.hs _validate- bug/stage1/libraries/base/build/GHC/RTS/Flags.hs libraries/base/GHC/Read.hs libraries/base/GHC/Real.hs libraries/base/GHC/Records.hs libraries/base/GHC/ResponseFile.hs libraries/base/GHC/ST.hs libraries/base/GHC/STRef.hs libraries/base/GHC/Show.hs libraries/base/GHC/Stable.hs libraries/base/GHC/StableName.hs libraries/base/GHC/Stack.hs _validate- bug/stage1/libraries/base/build/GHC/Stack/CCS.hs libraries/base/GHC/Stack/Types.hs libraries/base/GHC/StaticPtr.hs libraries/base/GHC/StaticPtr/Internal.hs _validate- bug/stage1/libraries/base/build/GHC/Stats.hs libraries/base/GHC/Storable.hs libraries/base/GHC/TopHandler.hs libraries/base/GHC/TypeLits.hs libraries/base/GHC/TypeNats.hs libraries/base/GHC/Unicode.hs libraries/base/GHC/Weak.hs libraries/base/GHC/Word.hs libraries/base/Numeric.hs libraries/base/Numeric/Natural.hs libraries/base/Prelude.hs _validate- bug/stage1/libraries/base/build/System/CPUTime.hs _validate- bug/stage1/libraries/base/build/System/CPUTime/Posix/ClockGetTime.hs _validate-bug/stage1/libraries/base/build/System/CPUTime/Posix/RUsage.hs _validate-bug/stage1/libraries/base/build/System/CPUTime/Posix/Times.hs libraries/base/System/CPUTime/Unsupported.hs libraries/base/System/CPUTime/Utils.hs libraries/base/System/Console/GetOpt.hs libraries/base/System/Environment.hs _validate- bug/stage1/libraries/base/build/System/Environment/Blank.hs _validate- bug/stage1/libraries/base/build/System/Environment/ExecutablePath.hs libraries/base/System/Exit.hs libraries/base/System/IO.hs libraries/base/System/IO/Error.hs libraries/base/System/IO/Unsafe.hs libraries/base/System/Info.hs libraries/base/System/Mem.hs libraries/base/System/Mem/StableName.hs libraries/base/System/Mem/Weak.hs libraries/base/System/Posix/Internals.hs libraries/base/System/Posix/Types.hs libraries/base/System/Timeout.hs libraries/base/Text/ParserCombinators/ReadP.hs libraries/base/Text/ParserCombinators/ReadPrec.hs libraries/base/Text/Printf.hs libraries/base/Text/Read.hs libraries/base/Text/Read/Lex.hs libraries/base/Text/Show.hs libraries/base/Text/Show/Functions.hs libraries/base/Type/Reflection.hs libraries/base/Type/Reflection/Unsafe.hs libraries/base/Unsafe/Coerce.hs +RTS -t_validate-bug/stage1/libraries/base/build/haddock.t --machine- readable -RTS Exit code: -11 Stderr: ) }}} -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/16239> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #16274: Remove ghctags
by GHC 04 Mar '19

04 Mar '19

#16274: Remove ghctags -------------------------------------+------------------------------------- Reporter: ulysses4ever | Owner: (none) Type: task | Status: new Priority: normal | Milestone: Component: None | Version: 8.6.3 Keywords: newcomer | Operating System: Unknown/Multiple Architecture: | Type of failure: None/Unknown Unknown/Multiple | Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- This was suggested by Ben in the ghc-devs list. Does anyone desire to preserve it? As a newcomer, I think the existence of dead tools adds confusion. I didn't know what to peek at some point (try make etags work / hasktags / ghctags). I tentatively mark this as a newcomer task. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/16274> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #16195: Program with trivial polymorphism leads to out of scope dictionary
by GHC 04 Mar '19

04 Mar '19

#16195: Program with trivial polymorphism leads to out of scope dictionary -------------------------------------+------------------------------------- Reporter: mpickering | Owner: (none) Type: bug | Status: new Priority: high | Milestone: 8.8.1 Component: Compiler | Version: 8.7 Keywords: | Operating System: Unknown/Multiple TypedTemplateHaskell | Architecture: | Type of failure: None/Unknown Unknown/Multiple | Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- Almost certainly due to c2455e647501c5a382861196b64df3dd05b620a2 A trivial program now causes a core lint error due to an out-of-scope dictionary. {{{ module A where foo :: Code (IO ()) foo = [|| return () ||] }}} {{{ module B where main :: IO () main = $$foo }}} {{{ *** Core Lint errors : in result of Desugar (before optimization) *** <no location info>: warning: In the expression: return @ IO $dMonad_a4od @ () () Out of scope: $dMonad_a4od :: Monad m_a4oc[tau:0] [LclId] *** Offending Program *** Rec { $trModule :: Module [LclIdX] $trModule = Module (TrNameS "main"#) (TrNameS "B"#) main :: IO () [LclIdX] main = return @ IO $dMonad_a4od @ () () end Rec } *** End of Offense *** }}} -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/16195> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #15865: Typed template haskell and implicit parameters lead to incorrect results
by GHC 04 Mar '19

04 Mar '19

#15865: Typed template haskell and implicit parameters lead to incorrect results -------------------------------------+------------------------------------- Reporter: mpickering | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.6.1 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 a similar vein to #15863 but this time with implicit parameters. https://gist.github.com/b6919b13abe0954fdad844e16e0edb48 {{{ {-# LANGUAGE ImplicitParams #-} {-# LANGUAGE TemplateHaskell #-} module A where import Language.Haskell.TH import Data.List (sortBy) sort :: (?cmp :: a -> a -> Ordering) => [a] -> [a] sort = sortBy ?cmp me :: Q (TExp ([Int] -> [Int])) me = let ?cmp = compare in [|| sort ||] }}} In module `A` we quote a value which has an implicit argument but in its context we bind the implicit so the type of the quote is the monomorphic type. {{{ {-# LANGUAGE ImplicitParams #-} {-# LANGUAGE TemplateHaskell #-} module B where import A foo :: [Int] -> [Int] foo = --let ?cmp = compare in $$(me) }}} When we splice in `me`, we get an error about an unbound implicit parameter which is totally bogus as we already bound it in `A`. There is also dynamic binding if another implicit parameter with the same name is in scope but the type of `me` mentions nothing about implicit parameters so this shouldn't be allowed. {{{ B.hs:8:10: error: • Unbound implicit parameter (?cmp::Int -> Int -> Ordering) arising from a use of ‘sort’ • In the expression: sort In the result of the splice: $me To see what the splice expanded to, use -ddump-splices In the Template Haskell splice $$(me) | 8 | foo = $$(me) | ^^ Failed, one module loaded. }}} -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15865> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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