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Ticket Summary Status Owner Type Priority Milestone
#9509 No automatic specialization of inlinable imports in 7.8 new bug normal
#9887 No message when GCHI reusing compiled code new feature request normal
#8871 No-op assignment I64[BaseReg + 784] = I64[BaseReg + 784]; is generated into optimized Cmm new bug normal
#8970 Non-exhaustive pattern match warning with DataKinds and TypeFamilies new bug normal
#2260 Non-ideal error message for misplaced LANGUAGE pragma new bug lowest 7.12.1
#4899 Non-standard compile plus Template Haskell produces spurious "unknown symbol" linker error new simonmar bug low 7.12.1
#8399 Of Bird tacks and non-blank blank lines new bug low
#10055 Offer PolyKinded instances for Data.Fixed.HasResolution new feature request low
#5813 Offer a compiler warning for failable pattern matches new feature request normal 7.12.1
#9702 Offer a weaker name shadowing warning new feature request normal
#9659 Offer branchless conditional (CMOV) primop new feature request normal
#849 Offer control over branch prediction new feature request normal 7.12.1
#9923 Offer copy-on-GC sliced arrays new simonmar feature request normal
#8198 One-shot mode is buggy w.r.t. hs-boot files new parcs bug normal 7.12.1
#10005 Operations on string literals won't be inlined new bug normal
#7596 Opportunity to improve CSE new simonpj bug normal 7.12.1
#1168 Optimisation sometimes decreases sharing in IO code new bug normal
#1600 Optimisation: CPR the results of IO new task lowest 7.12.1
#1498 Optimisation: eliminate unnecessary heap check in recursive function new bug low 7.12.1
#605 Optimisation: strict enumerations new task normal
#4301 Optimisations give bad core for foldl' (flip seq) () new bug low 7.12.1
#2132 Optimise nested comparisons new bug normal
#7977 Optimization: Shift dropped list heads by coeffecient to prevent thunk generation new feature request low
#9645 Optimize range checks for primitive types new feature request normal
#8317 Optimize tagToEnum# at Core level new jstolarek task normal
#2387 Optimizer misses unboxing opportunity new bug lowest 7.12.1
#8629 Option 'split-objs' being ignored when trying to reduce object code size in iOS cross-compilation new bug normal
#9931 Option to truncate Show output in ghci REPL new feature request normal
#3919 Or-patterns as GHC extension new feature request normal
#8363 Order matters for unused import warnings when reexporting identifiers new bug normal
#8082 Ordering of assembly blocks affects performance new bug normal
#8799 Orientation of given `Coercible` constraints new feature request normal
#5316 Orphan instances strike again: ghc rejects a program at first but will accept it if you repeat the same compilation command new bug low
#3107 Over-eager GC when blocked on a signal in the non-threaded runtime new bug lowest 7.12.1
#595 Overhaul GHC's overlapping/non-exhaustive pattern checking new task normal
#8710 Overlapping patterns warning misplaced new bug low
#9951 OverloadedLists breaks exhaustiveness check new bug normal
#9809 Overwhelming the TimerManager new simonmar bug normal
#9297 Packages linked against certain Windows .dll files give warnings at runtime new simonmar bug normal
#10052 Panic (something to do with floatExpr?) new simonmar bug high 7.10.1
#9046 Panic in GHCi when using :print new bug normal 7.12.1
#7078 Panic using mixing list with parallel arrays incorrectly new chak bug normal 7.12.1
#9160 Panic: Template variable unbound in rewrite rule new bug normal 7.8.3
#7380 Panic: mkNoTick: Breakpoint loading modules with -O2 via API new bug normal 7.12.1
#9219 Parallel build proceeds despite errors new bug normal
#4091 Parse error on curried context of instance declaration new feature request normal
#6034 Parse error when using ' with promoted kinds new bug low
#8956 Parser error shadowed by "module ‘main:Main’ is defined in multiple files" error new bug normal
#4043 Parsing of guards, and type signatures new bug normal
#3766 Parsing of lambdas is not consistent with Haskell'98 report. new bug low 7.12.1
#9478 Partial type signatures new feature request normal
#9554 Pathological type family turns type error into runtime loop new bug normal
#10134 Pattern Matching Causes Infinite Type Error new bug normal
#8325 Pattern guards in anonymous functions new feature request normal
#9911 Pattern synonyms with no signatures should yield warnings new cactus feature request normal 7.12.1
#9088 Per-thread Haskell thread list/numbering (remove global lock from thread allocation) new simonmar bug low
#9944 Performance issue re: simple loop new bug low
#9960 Performance problem with TrieMap new bug normal
#5954 Performance regression 7.0 -> 7.2 (still in 7.4) new simonpj bug normal 7.12.1
#9979 Performance regression GHC 7.8.4 to GHC HEAD new bug normal
#6166 Performance regression in mwc-random since 7.0.x new bug normal 7.12.1
#8990 Performance tests behave differently depending on presence of .hi file (even with -fforce-recomp) new bug normal
#3231 Permission denied error with runProcess/openFile new simonmar bug normal 7.12.1
#9840 Permit empty closed type families new feature request normal
#8326 Place heap checks common in case alternatives before the case new task normal
#4020 Please consider adding support for local type synonyms new feature request low 7.12.1
#4459 Polymorphic Data.Dynamic new vivian feature request low 7.12.1
#5326 Polymorphic instances aren't automatically specialised new simonpj bug low 7.12.1
#9730 Polymorphism and type classes new bug normal
#4288 Poor -fspec-constr-count=n warning messages new bug low 7.12.1
#9803 Poor error message for unbound variable in pattern synonym new bug normal
#8313 Poor performance of higher-order functions with unboxing new task low
#9993 PostfixOperators doesn't work for types new feature request normal
#9981 Potential typechecker regression in GHC 7.10.1RC new simonpj bug normal 7.12.1
#9886 PowerPC : Undefined reference to `__sync_fetch_and_xor_8' new erikd bug normal
#5059 Pragma to SPECIALISE on value arguments new feature request low 7.12.1
#1727 Precedence and associativity rules ignored when mixing infix type and data constructors in a single expression new bug lowest 7.12.1
#9894 Presence of DWARF debug symbols doesn't result in working backtraces in GDB new scpmw bug normal
#9121 Presence of dyn_o files not checked upon recompilation new bug high
#8809 Prettier error messages? new feature request normal
#8207 Pretty Printer for textual version of Language (name) in DynFlags new feature request low
#8403 Pretty-printing of long types new bug lowest
#4101 Primitive constant unfolding new schyler bug low 7.12.1
#8472 Primitive string literals prevent optimization new xnyhps bug normal
#1158 Problem with GADTs and explicit type signatures new simonpj bug lowest
#10133 Problemlösung pur- durch advana tone abnehmen new bug lowest
#9421 Problems and workarounds when installing and using a 32bit GHC on 64bit Linux machine new MikolajKonarski bug normal
#9790 Produce coercion rules for derived Functor instances new feature request normal
#9105 Profiling binary consumes CPU even when idle on Linux. new simonmar bug normal
#8811 Profiling output jumbled together new bug normal
#8948 Profiling report resolution too low new bug normal
#5654 Profiling semantics bug new simonmar bug low 7.12.1
#6113 Profiling with -p not written if killed with SIGTERM new bug normal 7.12.1
#624 Program location for thread error messages new task normal
#9407 Program produces different output when compiled with -O new bug normal
#9607 Programs that require AllowAmbiguousTypes in 7.8 new bug normal
#9632 Promotable type synonyms (or: synonyms to promoted types) new feature request normal
#8504 Provide minor GC residency estimates new simonmar feature request lowest
#1451 Provide way to show the origin of a constraint new feature request normal
#10077 Providing type checker plugin on command line results in false cyclic import error new bug normal
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