March 2015 - ghc-tickets

[GHC] #9974: Allow more general structural recursion without UndecidableInstances
by GHC 15 Dec '15

15 Dec '15

#9974: Allow more general structural recursion without UndecidableInstances -------------------------------------+------------------------------------- Reporter: dfeuer | Owner: Type: feature | Status: new request | Milestone: Priority: normal | Version: 7.11 Component: Compiler | Operating System: Unknown/Multiple (Type checker) | Type of failure: None/Unknown Keywords: | Blocked By: Architecture: | Related Tickets: Unknown/Multiple | Test Case: | Blocking: | Differential Revisions: | -------------------------------------+------------------------------------- I bet this is a duplicate, but I couldn't find it. A simple example from the `HList` package: {{{#!hs type family HRevApp (l1 :: [k]) (l2 :: [k]) :: [k] type instance HRevApp '[] l = l type instance HRevApp (e ': l) l' = HRevApp l (e ': l') }}} GHC 7.8.3 and 7.11 both complain about the second instance if `UndecidableInstances` is turned off, because the application is no smaller than the index head. Moreover, the same error occurs when the type family is closed. However, GHC already knows how to separate term-level definitions into recursive groups; applying this same analysis to the type family above would reveal that `HRevApp` is structurally recursive, and therefore decidable. It is key, in this case, that the instance for `[]` is visible from the instance declaration for `e ': l`, so such an analysis could only be done in module dependency order for open type families. Side note: there is a (nasty) workaround available for the problem in this case: {{{#!hs type family HRevApp' (l1 :: [k]) (l1' :: [k]) (l2 :: [k]) :: [k] type instance HRevApp' t '[] l = l type instance HRevApp' (e ': l) (e' ': l') l'' = HRevApp' l l' (e ': l'') type HRevApp l1 l2 = HRevApp' l1 l1 l2 }}} -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9974> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #9981: Potential typechecker regression in GHC 7.10.1RC
by GHC 15 Dec '15

15 Dec '15

#9981: Potential typechecker regression in GHC 7.10.1RC -------------------------------------+------------------------------------- Reporter: hvr | Owner: simonpj Type: bug | Status: new Priority: highest | Milestone: 7.10.1 Component: Compiler | Version: 7.10.1-rc1 (Type checker) | Operating System: Unknown/Multiple Keywords: | Type of failure: GHC rejects Architecture: | valid program Unknown/Multiple | Blocked By: Test Case: | Related Tickets: Blocking: | Differential Revisions: | -------------------------------------+------------------------------------- The following snippet (extracted from hackage:index-core) is accepted by GHCs prior to GHC 7.10: {{{#!hs {-# LANGUAGE Rank2Types, TypeOperators #-} module Foo where type a :-> b = forall i . a i -> b i class IFunctor f where fmapI :: (a :-> b) -> (f a :-> f b) class (IFunctor m) => IMonad m where returnI :: a :-> m a bindI :: (a :-> m b) -> (m a :-> m b) (?>=) :: (IMonad m) => m a i -> (a :-> m b) -> m b i (?>=) = flip bindI }}} {{{ $ ghci-7.8.4 -Wall Foo.hs GHCi, version 7.8.4: http://www.haskell.org/ghc/ :? for help Loading package ghc-prim ... linking ... done. Loading package integer-gmp ... linking ... done. Loading package base ... linking ... done. [1 of 1] Compiling Control.IMonad.Core ( Foo.hs, interpreted ) Ok, modules loaded: Control.IMonad.Core. λ:2> :browse type (:->) (a :: * -> *) (b :: * -> *) = forall i. a i -> b i class IFunctor (f :: (* -> *) -> * -> *) where fmapI :: (a :-> b) -> f a :-> f b class IFunctor m => IMonad (m :: (* -> *) -> * -> *) where returnI :: a i -> m a i bindI :: (a :-> m b) -> m a :-> m b (?>=) :: IMonad m => m a i -> (a :-> m b) -> m b i }}} vs. {{{ $ ghci-7.10.0.20141227 -Wall Foo.hs GHCi, version 7.10.0.20141227: http://www.haskell.org/ghc/ :? for help [1 of 1] Compiling Control.IMonad.Core ( Foo.hs, interpreted ) Foo.hs:15:14: Couldn't match type ‘a i0 -> m b i0’ with ‘forall i1. a i1 -> m b i1’ Expected type: (a i0 -> m b i0) -> m a i -> m b i Actual type: a :-> m b -> m a i -> m b i Relevant bindings include (?>=) :: m a i -> a :-> m b -> m b i (bound at Foo.hs:15:1) In the first argument of ‘flip’, namely ‘bindI’ In the expression: flip bindI Failed, modules loaded: none. λ:2> }}} I'm not sure though whether that module was valid to begin with... -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9981> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #9996: Support symbols in GHCi tab completion
by GHC 15 Dec '15

15 Dec '15

#9996: Support symbols in GHCi tab completion -------------------------------------+------------------------------------- Reporter: shachaf | Owner: Type: feature | Status: new request | Milestone: Priority: normal | Version: 7.8.4 Component: GHCi | Operating System: Unknown/Multiple Keywords: | Type of failure: None/Unknown Architecture: | Blocked By: Unknown/Multiple | Related Tickets: Test Case: | Blocking: | Differential Revisions: | -------------------------------------+------------------------------------- Right now, when typing e.g. `>` followed by two tabs, GHCi shows every name in scope rather than just names beginning with `>`. It even lists operators as possible completions, but ignores it when you type the beginning of an operator's name. It would be better if it could actually complete every option it shows as a possible completion. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9996> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #8294: T7478 fails on Mac OS X with "unexpected bindingNone" from ld
by GHC 15 Dec '15

15 Dec '15

#8294: T7478 fails on Mac OS X with "unexpected bindingNone" from ld -----------------------------------+--------------------------------------- Reporter: ezyang | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: GHC API | Version: 7.7 Keywords: | Operating System: MacOS X Architecture: | Type of failure: Compile-time crash Unknown/Multiple | Test Case: T7478 Difficulty: Unknown | Blocking: Blocked By: | Related Tickets: | -----------------------------------+--------------------------------------- (Tangentially, the test script was swallowing up relevant output; you need to get rid of the output hook to see any debugging output from GHC proper). Linker step fails: {{{ *** Linker: /usr/bin/gcc -m64 -fno-stack-protector -DTABLES_NEXT_TO_CODE -m64 -v -o A -Wl,-no_compact_unwind C.o -L/Users/ezyang/Dev/ghc-init/libraries/base /dist-install/build -L/Users/ezyang/Dev/ghc-init/libraries/integer-gmp /dist-install/build -L/Users/ezyang/Dev/ghc-init/libraries/ghc-prim/dist- install/build -L/Users/ezyang/Dev/ghc-init/rts/dist/build /var/folders/l8/1lth36c11yg8dv_3kz779_th0000gn/T/ghc26290_0/ghc26290_10.o -lHSbase-4.7.0.0-ghc7.7.20130913 -lHSinteger-gmp-0.5.1.0-ghc7.7.20130913 -lHSghc-prim-0.3.1.0-ghc7.7.20130913 -lHSrts-ghc7.7.20130913 -lffi -liconv -lm -ldl -Wl,-u,_ghczmprim_GHCziTypes_Izh_static_info -Wl,-u,_ghczmprim_GHCziTypes_Czh_static_info -Wl,-u,_ghczmprim_GHCziTypes_Fzh_static_info -Wl,-u,_ghczmprim_GHCziTypes_Dzh_static_info -Wl,-u,_base_GHCziPtr_Ptr_static_info -Wl,-u,_ghczmprim_GHCziTypes_Wzh_static_info -Wl,-u,_base_GHCziInt_I8zh_static_info -Wl,-u,_base_GHCziInt_I16zh_static_info -Wl,-u,_base_GHCziInt_I32zh_static_info -Wl,-u,_base_GHCziInt_I64zh_static_info -Wl,-u,_base_GHCziWord_W8zh_static_info -Wl,-u,_base_GHCziWord_W16zh_static_info -Wl,-u,_base_GHCziWord_W32zh_static_info -Wl,-u,_base_GHCziWord_W64zh_static_info -Wl,-u,_base_GHCziStable_StablePtr_static_info -Wl,-u,_ghczmprim_GHCziTypes_Izh_con_info -Wl,-u,_ghczmprim_GHCziTypes_Czh_con_info -Wl,-u,_ghczmprim_GHCziTypes_Fzh_con_info -Wl,-u,_ghczmprim_GHCziTypes_Dzh_con_info -Wl,-u,_base_GHCziPtr_Ptr_con_info -Wl,-u,_base_GHCziPtr_FunPtr_con_info -Wl,-u,_base_GHCziStable_StablePtr_con_info -Wl,-u,_ghczmprim_GHCziTypes_False_closure -Wl,-u,_ghczmprim_GHCziTypes_True_closure -Wl,-u,_base_GHCziPack_unpackCString_closure -Wl,-u,_base_GHCziIOziException_stackOverflow_closure -Wl,-u,_base_GHCziIOziException_heapOverflow_closure -Wl,-u,_base_ControlziExceptionziBase_nonTermination_closure -Wl,-u,_base_GHCziIOziException_blockedIndefinitelyOnMVar_closure -Wl,-u,_base_GHCziIOziException_blockedIndefinitelyOnSTM_closure -Wl,-u,_base_ControlziExceptionziBase_nestedAtomically_closure -Wl,-u,_base_GHCziWeak_runFinalizzerBatch_closure -Wl,-u,_base_GHCziTopHandler_flushStdHandles_closure -Wl,-u,_base_GHCziTopHandler_runIO_closure -Wl,-u,_base_GHCziTopHandler_runNonIO_closure -Wl,-u,_base_GHCziConcziIO_ensureIOManagerIsRunning_closure -Wl,-u,_base_GHCziConcziIO_ioManagerCapabilitiesChanged_closure -Wl,-u,_base_GHCziConcziSync_runSparks_closure -Wl,-u,_base_GHCziConcziSignal_runHandlers_closure -Wl,-search_paths_first Using built-in specs. Target: i686-apple-darwin11 Configured with: /private/var/tmp/llvmgcc42/llvmgcc42-2336.11~182/src/configure --disable- checking --enable-werror --prefix=/Applications/Xcode.app/Contents/Developer/usr/llvm-gcc-4.2 --mandir=/share/man --enable-languages=c,objc,c++,obj-c++ --program- prefix=llvm- --program-transform-name=/^[cg][^.-]*$/s/$/-4.2/ --with- slibdir=/usr/lib --build=i686-apple-darwin11 --enable- llvm=/private/var/tmp/llvmgcc42/llvmgcc42-2336.11~182/dst- llvmCore/Developer/usr/local --program-prefix=i686-apple-darwin11- --host=x86_64-apple-darwin11 --target=i686-apple-darwin11 --with-gxx- include-dir=/usr/include/c++/4.2.1 Thread model: posix gcc version 4.2.1 (Based on Apple Inc. build 5658) (LLVM build 2336.11.00) /usr/llvm-gcc-4.2/bin/../libexec/gcc/i686-apple-darwin11/4.2.1/collect2 -dynamic -arch x86_64 -macosx_version_min 10.8.3 -weak_reference_mismatches non-weak -o A -lcrt1.10.6.o -L/Users/ezyang/Dev /ghc-init/libraries/base/dist-install/build -L/Users/ezyang/Dev/ghc- init/libraries/integer-gmp/dist-install/build -L/Users/ezyang/Dev/ghc- init/libraries/ghc-prim/dist-install/build -L/Users/ezyang/Dev/ghc- init/rts/dist/build -L/usr/llvm-gcc-4.2/bin/../lib/gcc/i686-apple- darwin11/4.2.1/x86_64 -L/Applications/Xcode.app/Contents/Developer/usr /llvm-gcc-4.2/lib/gcc/i686-apple-darwin11/4.2.1/x86_64 -L/usr/llvm- gcc-4.2/bin/../lib/gcc/i686-apple-darwin11/4.2.1 -L/usr/llvm- gcc-4.2/bin/../lib/gcc -L/Applications/Xcode.app/Contents/Developer/usr /llvm-gcc-4.2/lib/gcc/i686-apple-darwin11/4.2.1 -L/usr/llvm- gcc-4.2/bin/../lib/gcc/i686-apple-darwin11/4.2.1/../../.. -L/Applications/Xcode.app/Contents/Developer/usr/llvm-gcc-4.2/lib/gcc/i686 -apple-darwin11/4.2.1/../../.. -no_compact_unwind C.o /var/folders/l8/1lth36c11yg8dv_3kz779_th0000gn/T/ghc26290_0/ghc26290_10.o -lHSbase-4.7.0.0-ghc7.7.20130913 -lHSinteger-gmp-0.5.1.0-ghc7.7.20130913 -lHSghc-prim-0.3.1.0-ghc7.7.20130913 -lHSrts-ghc7.7.20130913 -lffi -liconv -lm -ldl -u _ghczmprim_GHCziTypes_Izh_static_info -u _ghczmprim_GHCziTypes_Czh_static_info -u _ghczmprim_GHCziTypes_Fzh_static_info -u _ghczmprim_GHCziTypes_Dzh_static_info -u _base_GHCziPtr_Ptr_static_info -u _ghczmprim_GHCziTypes_Wzh_static_info -u _base_GHCziInt_I8zh_static_info -u _base_GHCziInt_I16zh_static_info -u _base_GHCziInt_I32zh_static_info -u _base_GHCziInt_I64zh_static_info -u _base_GHCziWord_W8zh_static_info -u _base_GHCziWord_W16zh_static_info -u _base_GHCziWord_W32zh_static_info -u _base_GHCziWord_W64zh_static_info -u _base_GHCziStable_StablePtr_static_info -u _ghczmprim_GHCziTypes_Izh_con_info -u _ghczmprim_GHCziTypes_Czh_con_info -u _ghczmprim_GHCziTypes_Fzh_con_info -u _ghczmprim_GHCziTypes_Dzh_con_info -u _base_GHCziPtr_Ptr_con_info -u _base_GHCziPtr_FunPtr_con_info -u _base_GHCziStable_StablePtr_con_info -u _ghczmprim_GHCziTypes_False_closure -u _ghczmprim_GHCziTypes_True_closure -u _base_GHCziPack_unpackCString_closure -u _base_GHCziIOziException_stackOverflow_closure -u _base_GHCziIOziException_heapOverflow_closure -u _base_ControlziExceptionziBase_nonTermination_closure -u _base_GHCziIOziException_blockedIndefinitelyOnMVar_closure -u _base_GHCziIOziException_blockedIndefinitelyOnSTM_closure -u _base_ControlziExceptionziBase_nestedAtomically_closure -u _base_GHCziWeak_runFinalizzerBatch_closure -u _base_GHCziTopHandler_flushStdHandles_closure -u _base_GHCziTopHandler_runIO_closure -u _base_GHCziTopHandler_runNonIO_closure -u _base_GHCziConcziIO_ensureIOManagerIsRunning_closure -u _base_GHCziConcziIO_ioManagerCapabilitiesChanged_closure -u _base_GHCziConcziSync_runSparks_closure -u _base_GHCziConcziSignal_runHandlers_closure -search_paths_first -lSystem -lgcc -lSystem ld: warning: PIE disabled. Absolute addressing (perhaps -mdynamic-no-pic) not allowed in code signed PIE, but used in _Main_main_info from C.o. To fix this warning, don't compile with -mdynamic-no-pic or link with -Wl,-no_pie final section layout: __TEXT/__text addr=0x100000D30, size=0x00000218, fileOffset=0x00000D30, type=1 __TEXT/__stubs addr=0x100000F48, size=0x0000001E, fileOffset=0x00000F48, type=27 __TEXT/__stub_helper addr=0x100000F68, size=0x00000042, fileOffset=0x00000F68, type=31 __TEXT/__eh_frame addr=0x100000FB0, size=0x00000048, fileOffset=0x00000FB0, type=18 __DATA/__program_vars addr=0x100001000, size=0x00000028, fileOffset=0x00001000, type=29 __DATA/__got addr=0x100001028, size=0x00000020, fileOffset=0x00001028, type=28 __DATA/__nl_symbol_ptr addr=0x100001048, size=0x00000010, fileOffset=0x00001048, type=28 __DATA/__la_symbol_ptr addr=0x100001058, size=0x00000028, fileOffset=0x00001058, type=26 __DATA/__data addr=0x100001080, size=0x00000040, fileOffset=0x00001080, type=0 __DATA/__const addr=0x1000010C0, size=0x00000018, fileOffset=0x000010C0, type=0 __DATA/__common addr=0x1000010D8, size=0x00000020, fileOffset=0x00000000, type=24 ld: unexpected bindingNone in '_Main_main_info' from C.o for architecture x86_64 collect2: ld returned 1 exit status T7478: T7478: phase `Linker' failed (exitcode = 1) }}} Unfortunately, I don't know what a bindingNone is... -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8294> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #9632: Promotable type synonyms (or: synonyms to promoted types)
by GHC 15 Dec '15

15 Dec '15

#9632: Promotable type synonyms (or: synonyms to promoted types) -------------------------------------+------------------------------------- Reporter: jstolarek | Owner: Type: feature request | Status: new Priority: normal | Milestone: Component: Compiler (Type | Version: checker) | Operating System: Keywords: | Unknown/Multiple Architecture: Unknown/Multiple | Type of failure: Difficulty: Unknown | None/Unknown Blocked By: | Test Case: Related Tickets: | Blocking: | Differential Revisions: -------------------------------------+------------------------------------- I want to use '''synonyms to promoted types''' in the same places where I can use the '''promoted types''': {{{#!hs {-# LANGUAGE DataKinds, KindSignatures #-} module PromotableTypeSynonyms where data B = T | F data P :: B -> * type B' = B data P' :: B' -> * -- using B' synonym here is currently not allowed }}} -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9632> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #8566: Panic with kindFunResult
by GHC 12 Dec '15

12 Dec '15

#8566: Panic with kindFunResult ------------------------------------+------------------------------------- Reporter: dreixel | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | 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: | ------------------------------------+------------------------------------- The following program: {{{ {-# LANGUAGE DataKinds #-} {-# LANGUAGE PolyKinds #-} {-# LANGUAGE GADTs #-} {-# LANGUAGE FlexibleInstances #-} {-# LANGUAGE ScopedTypeVariables #-} {-# LANGUAGE TypeOperators #-} {-# LANGUAGE UndecidableInstances #-} {-# LANGUAGE MultiParamTypeClasses #-} module Bug where data U (s :: *) = forall k. AA k [U s] data I (u :: U *) (r :: [*]) :: * where A :: I (AA t as) r -- fs unused, but needs to be present for the bug class C (u :: U *) (r :: [*]) (fs :: [*]) where c :: I u r -> I u r instance (C (AA (t (I a ps)) as) ps fs) => C (AA t (a ': as)) ps fs where c A = c undefined }}} crashes a fresh copy of GHC HEAD with the following: {{{ ghc-stage2: panic! (the 'impossible' happened) (GHC version 7.7.20131126 for i386-unknown-linux): kindFunResult k1{tv a24f} [ssk] }}} -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8566> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #9017: Confusing error message with PolyKinds
by GHC 12 Dec '15

12 Dec '15

#9017: Confusing error message with PolyKinds ------------------------------------+------------------------------------- Reporter: edsko | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.8.2 Keywords: | Operating System: Unknown/Multiple Architecture: Unknown/Multiple | Type of failure: None/Unknown Difficulty: Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | ------------------------------------+------------------------------------- Consider the following example code: {{{ import Control.Arrow foo :: a b (m b) foo = arr return }}} if we typecheck this we rightly get two errors about missing instances (Arrow a, Monad m). However, if we enable `PolyKinds` we get the following error message: {{{ T.hs:4:7: Kind incompatibility when matching types: a0 :: * -> * -> * a :: k1 -> k -> * Expected type: a b (m b) Actual type: a0 b0 (m0 b0) Relevant bindings include foo :: a b (m b) (bound at T.hs:4:1) In the expression: arr return In an equation for ‘foo’: foo = arr return }}} I can ''sort of'' see where this is coming from if I think really hard :), so perhaps it's not a bug per se, but it's definitely confusing; and it's a pity that a type error (forgotten type qualifier) is reported as a kind error. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9017> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #9389: Full Test Suite Failures
by GHC 12 Dec '15

12 Dec '15

#9389: Full Test Suite Failures ------------------------------------+---------------------------------- Reporter: jrp | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Test Suite | Version: 7.8.3 Keywords: | Operating System: MacOS X Architecture: Unknown/Multiple | Type of failure: Other Difficulty: Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Revisions: ------------------------------------+---------------------------------- This is just to record progress on running the full test suite on OS X for the current HEAD using a BuildFlavour = perf build. I'll check through these (some of which are configuration issues because of the non-standard build or some required libraries are not being pulled in). {{{ OVERALL SUMMARY for test run started at Thu Jul 31 23:03:39 2014 BST 0:32:31 spent to go through 4036 total tests, which gave rise to 19262 test cases, of which 4218 were skipped 358 had missing libraries 14485 expected passes 135 expected failures 0 caused framework failures 0 unexpected passes 66 unexpected failures Unexpected failures: ../../libraries/base/tests enum01 [exit code non-0] (normal,hpc,optasm,profasm,threaded1,threaded2,dyn,profthreaded,optllvm) ../../libraries/base/tests enum01 [bad stdout or stderr] (ghci) ../../libraries/base/tests enum02 [exit code non-0] (normal,hpc,optasm,profasm,threaded1,threaded2,dyn,profthreaded,optllvm) ../../libraries/base/tests enum02 [bad stdout or stderr] (ghci) ../../libraries/base/tests enum03 [exit code non-0] (normal,hpc,optasm,profasm,threaded1,threaded2,dyn,profthreaded,optllvm) ../../libraries/base/tests enum03 [bad stdout or stderr] (ghci) ../../libraries/unix/tests signals004 [bad exit code] (threaded2) concurrent/should_run T367_letnoescape [bad exit code] (optllvm) concurrent/should_run conc012 [bad exit code] (ghci) driver/objc objc-hi [bad profile] (profthreaded) driver/objc objc-hi [bad heap profile] (profasm) driver/objc objcpp-hi [bad profile] (profthreaded) driver/objc objcpp-hi [bad heap profile] (profasm) ffi/should_run ffi002 [bad exit code] (threaded2) indexed-types/should_compile T7837 [stderr mismatch] (profasm) perf/compiler T4801 [stat too good] (normal) perf/haddock haddock.base [stat not good enough] (normal) perf/should_run T9203 [stat too good] (normal) profiling/should_run callstack001 [bad stdout] (prof) quasiquotation/qq007 qq007 [exit code non-0] (profasm) quasiquotation/qq008 qq008 [exit code non-0] (profasm) rts T5435_dyn_asm [bad stdout] (normal) rts T7919 [exit code non-0] (profasm,profthreaded) rts T9078 [exit code non-0] (profasm) rts derefnull [bad profile] (profasm,profthreaded) rts divbyzero [bad profile] (profasm,profthreaded) rts overflow1 [bad exit code] (hpc,optasm,profasm,threaded2,dyn,profthreaded,optllvm) rts overflow2 [bad profile] (profasm,profthreaded) rts overflow3 [bad profile] (profasm,profthreaded) simplCore/should_compile T5550 [exit code non-0] (profasm) simplCore/should_compile T7702 [exit code non-0] (profasm) }}} -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9389> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #8245: ghc-pkg list prints packages in non-alphabetical order
by GHC 07 Dec '15

07 Dec '15

#8245: ghc-pkg list prints packages in non-alphabetical order ------------------------------------+------------------------------------- Reporter: nh2 | 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: | ------------------------------------+------------------------------------- Instead, it prints the ones with the smallest version first. That does not make much sense. I will attach a patch. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8245> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #9015: A documented way to differentiate between statements, declarations, imports, etc.
by GHC 07 Dec '15

07 Dec '15

#9015: A documented way to differentiate between statements, declarations, imports, etc. -------------------------------------+------------------------------------- Reporter: splinterofchaos | Owner: Type: feature request | Status: new Priority: normal | Milestone: Component: GHC API | Version: 7.8.2 Keywords: | Operating System: Unknown/Multiple Architecture: Unknown/Multiple | Type of failure: Documentation Difficulty: Moderate (less | bug than a day) | Test Case: Blocked By: | Blocking: Related Tickets: | -------------------------------------+------------------------------------- I'm working on a little REPL and the GHC API seems to supply two functions for evaluating one line, without compiling and evaluating into an `HValue`, which doesn't seem to have an `Outputable` instace: `runStmt` and `runDecls`. As it turns out, I need slightly different code to run on declarations verses statements, so this makes sense, but given a random string from the user, how can I tell the difference? I don't see anything in the documentation about this. I took a look at ghci's source (https://github.com/ghc/ghc/blob/a6f2c852d49313fa8acea2deb3741ab86c6ef995/gh…] and it looks like they just peek at the first word of the input, and that may be correct and sufficient, but impossible to verify without looking at Haskell's grammar. But even if I did verify it, that doesn't make explicit the difference between what `runDecls` and `runStmt` will accept. For a contrived example, consider if GHC implemented a feature that allowed for a new type of decl. It might be enabled by a language extension which means that testing whether a string is a statement or declaration cannot be done purely as we have to check the dynflags. Furthermore, the client may not be aware of the extension and thus send the input to `runStmt` instead. It would seem to me that requiring the user to manually parse the input violates separation of concerns since truly GHC knows best what source GHC will accept. The user should not have to examine the input except for if they need to modify or interpret it as something other than Haskell source code. The GHC API should either document an example function for differentiating declarations from statements (and even import statements), supply one itself, or supply several along the lines of `isDecl, isStmt, isImport :: String -> Bool`. This would improve ease-of-use by making client code more obvious and correct. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9015> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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