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Ticket Summary Status Owner Type Priority Milestone
#2132 Optimise nested comparisons new bug normal
#7977 Optimization: Shift dropped list heads by coeffecient to prevent thunk generation new feature request low
#8317 Optimize tagToEnum# at Core level new task normal
#3919 Or-patterns as GHC extension new feature request normal
#8363 Order matters for unused import warnings when reexporting identifiers 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
#595 Overhaul GHC's overlapping/non-exhaustive pattern checking new task normal
#8710 Overlapping patterns warning misplaced new bug low
#8057 PackageImports with versions for ghci new feature request normal
#5844 Panic on generating Core code new bug normal 7.6.2
#7078 Panic using mixing list with parallel arrays incorrectly new chak bug normal 7.8.3
#7736 Parallel array enumeration causes compiler panic (enumFromToP) new chak bug normal 7.8.3
#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 7.6.2
#5062 Patch: Debug output for OS X linker and coding standard upgrades new bug low 7.6.2
#8325 Pattern guards in anonymous functions new feature request normal
#8584 Pattern synonym type signatures new feature request normal
#8968 Pattern synonyms and GADTs new bug normal
#5954 Performance regression 7.0 -> 7.2 (still in 7.4) new simonpj bug high 7.6.2
#6166 Performance regression in mwc-random since 7.0.x new bug high 7.6.2
#8990 Performance tests behave differently depending on presence of .hi file (even with -fforce-recomp) new bug 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 7.6.2
#4459 Polymorphic Data.Dynamic new vivian feature request low 7.6.2
#5326 Polymorphic instances aren't automatically specialised new simonpj bug low 7.6.2
#4288 Poor -fspec-constr-count=n warning messages new bug low 7.6.2
#8313 Poor performance of higher-order functions with unboxing new task low
#3472 Porting through .hc files broken new bug high 7.8.3
#5059 Pragma to SPECIALISE on value arguments new feature request low 7.6.2
#1727 Precedence and associativity rules ignored when mixing infix type and data constructors in a single expression new bug lowest 7.6.2
#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 7.6.2
#1158 Problem with GADTs and explicit type signatures new simonpj bug lowest
#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 7.6.2
#6113 Profiling with -p not written if killed with SIGTERM new bug normal 7.6.2
#624 Program location for thread error messages new task normal
#368 Provide a Java Backend 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
#2531 Prune duplicates in ghci history new feature request lowest 7.6.2
#8844 Pseudo terminal and process-1.2.0.0 new feature request normal
#1147 Quadratic behaviour in the compacting GC new bug normal
#5376 Quotation in System.Process.system for Windows new bug low 7.6.2
#284 RPM doesn't support --prefix new juhp feature request normal
#3869 RTS GC Statistics from -S should be logged via the eventlog system new feature request low 7.6.2
#8676 RTS headers don't compile as C++ new simonmar bug normal 7.8.3
#7398 RULES don't apply to a newtype constructor new bug normal 7.8.3
#427 Random.StdGen slowness new rrnewton bug normal
#8346 Rank 1 type signature still requires RankNTypes new bug normal
#4451 Re-linking avoidance is too aggressive new bug normal 7.6.2
#6017 Reading ./.ghci files raises security issues new task high 7.8.3
#7495 Rebindable list syntax? new feature request normal 7.8.3
#7828 RebindableSyntax and Arrow new bug normal 7.8.3
#7845 RebindableSyntax should allow rebinding tuples and lists new feature request normal
#8610 Rebuild on a definition-based granularity new feature request normal
#7277 Recompilation check fails for TH unless functions are inlined new bug high 7.6.2
#8582 Record syntax for pattern synonyms new cactus feature request normal
#7788 Recursive type family causes <<loop>> new simonpj bug normal 7.8.3
#1262 RecursiveDo in Template Haskell new feature request normal
#8079 Redo T7919 and TH_spliceE5_prof with a cabal file new task normal
#8647 Reduce allocations in `integer-gmp` new task normal 7.8.3
#3355 Refactor Template Haskell syntax conversions new task lowest 7.6.2
#4121 Refactor the plumbing of CafInfo to make it more robust new bug low 7.6.2
#7063 Register allocators can't handle non-uniform register sets new benl bug normal 7.8.3
#8048 Register spilling produces ineffecient/highly contending code new bug normal
#7679 Regression in -fregs-graph performance new bug high 7.8.3
#7450 Regression in optimisation time of functions with many patterns (6.12 to 7.4)? new bug normal 7.8.3
#8953 Reifying poly-kinded type families misses kind annotations new goldfire bug normal
#5369 Reinstate VECTORISE pragmas with expressions as right-hand sides new chak bug normal 7.6.2
#8634 Relax functional dependency coherence check ("liberal coverage condition") new feature request high
#4259 Relax restrictions on type family instance overlap new feature request normal 7.8.3
#3490 Relax superclass restrictions new feature request normal
#8330 Remove ExtsCompat46 module once we bootstrap with GHC 7.8 new task highest 7.10.1
#2725 Remove Hack in compiler/nativeGen/MachCodeGen.hs new thoughtpolice bug high 7.8.3
#4374 Remove in-tree gmp new task high 7.8.3
#4937 Remove indirections caused by sum types, such as Maybe new feature request normal 7.6.2
#7961 Remove restrictions on promoting GADT's new feature request normal
#8226 Remove the old style -- # Haddock comments. new task normal 7.8.3
#8914 Remove unnecessary constraints from MonadComprehensions and ParallelListComp new feature request normal
#8244 Removing the Cabal dependency new bug normal
#8552 Rename StgArrWords to StgArrBytes new task lowest
#4438 Rename and register the "PArr" language extension when it is judged to be ready new benl task normal
#3065 Reorder tests in quot to improve code new bug lowest 7.6.2
#8545 Reorganize Git repositories new hvr task normal 7.10.1
#8785 Replace hooks API in the RTS with something better new simonmar task high 7.10.1
#2648 Report out of date interface files robustly new feature request lowest 7.6.2
#8308 Resurrect ticky code for counting constructor arity new task normal
#3138 Returning a known constructor: GHC generates terrible code for cmonad new bug lowest 7.6.2
#4295 Review higher-rank and impredicative types new simonpj bug normal 7.6.2
#2641 Revise the rules for -XExtendedDefaultRules new feature request lowest 7.6.2
#3024 Rewrite hp2ps in Haskell new task normal
#7611 Rewrite rules application prevented by type variable application (map id vs. map (\x -> x)) new bug normal 7.8.3
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