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Difficulty: Difficult (2-5 days) (1 match)

Ticket Summary Status Owner Priority Milestone Component
#4012 Compilation results are not deterministic new high 7.6.2 Compiler

Difficulty: Easy (less than 1 hour) (13 matches)

Ticket Summary Status Owner Priority Milestone Component
#8964 split_marker_entry assert breaks -split-objs and -ddump-opt-cmm new lowest Compiler
#4048 ghc-pkg should check for existence of extra-libraries new low 7.6.2 Package system
#8159 Uses of Binary decode should have a proper error message new low Compiler
#8303 defer StackOverflow exceptions (rather than dropping them) when exceptions are masked new thoughtpolice low 7.8.4 Runtime System
#8532 Hyperbolic arc cosine fails on (-1) :: Complex r. new low libraries/base
#8959 GHCi should honour UnicodeSyntax new low 7.10.1 Compiler
#8085 Both GHC and its installer don't run on current Debian Stable new normal Compiler
#8253 example "Core syntax" is ancient new normal Documentation
#8664 libffi does not recognize AArch64 (ARM64) new normal libraries (other)
#8796 -ddump-splices prints to error stream new normal Compiler
#8879 System.IO.Error documentation refers to invalid module Control.Exception.Exception new normal Documentation
#9053 make sdist fails with repeated /bin/sh[1]: lndir: not found [No such file or directory] new normal Build System
#9116 RTS Linker doesn't recognize .text.unlikely section on Windows new simonmar normal Runtime System

Difficulty: Moderate (less than a day) (16 matches)

Ticket Summary Status Owner Priority Milestone Component
#1498 Optimisation: eliminate unnecessary heap check in recursive function new low 7.6.2 Compiler
#5063 unix package has untracked dependency on libbsd new trommler low 7.10.1 libraries/unix
#149 missed CSE opportunity new normal Compiler
#670 External Core is broken new tim normal External Core
#703 all binaries built by ghc have executable stacks new ezyang normal Compiler (NCG)
#806 hGetBufNonBlocking doesn't work on Windows new normal libraries/base
#1057 Implicit parameters on breakpoints new normal GHCi
#1400 :set +r doesn't work for interpreted modules new simonmar normal GHCi
#1466 Stack check for AP_STACK new simonmar normal 7.6.2 Compiler
#4451 Re-linking avoidance is too aggressive new normal 7.6.2 Compiler
#7695 Hang when locale-archive and gconv-modules are not there new trommler normal 7.8.4 None
#8345 A more efficient atomicModifyIORef' new normal 7.10.1 libraries/base
#8427 GHC accepts invalid program because of EPS poisoning new normal 7.10.1 Compiler
#8790 rts: unrust 'libbfd' debug symbols parser new normal Compiler
#8949 switch -msse2 to be on by default new normal Compiler (CodeGen)
#9257 CC_CLANG_BACKEND not reconfigured during bindist install new normal Build System

Difficulty: Project (more than a week) (1 match)

Ticket Summary Status Owner Priority Milestone Component
#9202 Strange Closure Type new normal Compiler

Difficulty: Rocket Science (1 match)

Ticket Summary Status Owner Priority Milestone Component
#8935 Obscure linker bug leads to crash in GHCi new simonmar high 7.8.4 Runtime System

Difficulty: Unknown (68 matches)

Ticket Summary Status Owner Priority Milestone Component
#344 arrow notation: incorrect scope of existential dictionaries new ross lowest 7.6.2 Compiler (Type checker)
#367 Infinite loops can hang Concurrent Haskell new ezyang lowest Compiler
#418 throwTo to a thread inside 'block' new lowest Runtime System
#552 GHCi :m doesn't restore default decl new lowest GHCi
#917 -O introduces space leak new lowest Compiler
#926 infinite loop in ShutdownIOManager() new lowest Runtime System
#1012 ghc panic with mutually recursive modules and template haskell new lowest 7.6.2 Template Haskell
#1158 Problem with GADTs and explicit type signatures new simonpj lowest Compiler
#1307 Warning refers to code not in the source new lowest Compiler
#1330 Impredicativity bug: Church2 test gives a rather confusing error with the HEAD new simonpj lowest 7.6.2 Compiler (Type checker)
#1612 GHC_PACKAGE_PATH and $topdir bug new lowest 7.6.2 Package system
#1693 Make distclean (still) doesn't new lowest 7.6.2 Build System
#1727 Precedence and associativity rules ignored when mixing infix type and data constructors in a single expression new lowest 7.6.2 Compiler (Parser)
#1820 Windows segfault-catching only works for the main thread new lowest 7.6.2 Runtime System
#1853 hpc mix files for Main modules overwrite each other new AndyGill lowest 7.6.2 Code Coverage
#1883 GHC can't find library using "short" name new lowest 7.6.2 Compiler
#2028 STM slightly conservative on write-only transactions new lowest 7.6.2 Compiler
#2064 problems with duplicate modules new lowest 7.6.2 Package system
#2140 cpuTimePrecision is wrong for me on Windows (XP) new lowest 7.6.2 libraries/base
#2147 unhelpful error message for a misplaced DEPRECATED pragma new lowest 7.6.2 Compiler
#2159 Use a more efficient representation than [DynFlag] new lowest 7.6.2 Compiler
#2224 -fhpc inteferes/prevents rewrite rules from firing new andy@… lowest 7.6.2 Code Coverage
#2256 Incompleteness of type inference: must quantify over implication constraints new simonpj lowest 7.6.2 Compiler
#2260 Non-ideal error message for misplaced LANGUAGE pragma new lowest 7.6.2 Compiler (Parser)
#2273 inlining defeats seq new lowest 7.6.2 Compiler
#2289 Needless reboxing of values when returning from a tight loop new lowest 7.6.2 Compiler
#2346 Compilation of large source files requires a lot of RAM new lowest 7.6.2 Compiler
#2370 num009 fails on OS X 10.5? new lowest 7.6.2 Compiler
#2374 MutableByteArray# is slower than Addr# new lowest 7.6.2 Compiler (NCG)
#2387 Optimizer misses unboxing opportunity new lowest 7.6.2 Compiler
#2439 Missed optimisation with dictionaries and loops new simonpj lowest 7.6.2 Compiler
#2459 can't link haskell without "main" function, or -no-hs-main broken on windows? new lowest 7.6.2 Driver
#2530 deriving Show adds extra parens for constructor with record syntax new lowest 7.6.2 Compiler
#2642 Improve SpecConstr for join points new lowest 7.6.2 Compiler
#2710 -main-is flag in {-# OPTIONS #-} pragma not fully supported new lowest 7.6.2 Compiler
#2731 Avoid unnecessary evaluation when unpacking constructors new lowest 7.6.2 Compiler
#2776 Document -pgmL (Use cmd as the literate pre-processor) new lowest 7.6.2 Documentation
#2805 Test ffi009(ghci) fails on PPC Mac OS X new lowest 7.6.2 GHCi
#2867 Make a way to tell GHC that a pragma name should be "recognised" new lowest 7.6.2 Compiler
#2933 LDFLAGS ignored by build system new lowest 7.6.2 Build System
#2940 Do CSE after CorePrep new simonpj lowest 7.6.2 Compiler
#2988 Improve float-in new lowest 7.6.2 Compiler
#2991 .mix files generation broken with -fhpc and --make flags with lhs modules new andy@… lowest 7.6.2 Code Coverage
#3003 Happy does not reject pragmas new lowest 7.6.2 Build System
#3055 Int / Word / IntN / WordN are unequally optimized new lowest 7.6.2 Compiler
#3061 GHC's GC default heap growth strategy is not as good as other runtimes new lowest 7.6.2 Runtime System
#3065 Reorder tests in quot to improve code new lowest 7.6.2 libraries/base
#3070 floor(0/0) should not be defined new squadette lowest 7.6.2 Prelude
#3073 Avoid reconstructing dictionaries in recursive instance methods new lowest 7.6.2 Compiler
#3107 Over-eager GC when blocked on a signal in the non-threaded runtime new lowest 7.6.2 Runtime System
#3138 Returning a known constructor: GHC generates terrible code for cmonad new lowest 7.6.2 Compiler
#3191 hpc reports spurious results with .lhs files even after processing with ghc -E new andy@… lowest 7.6.2 Code Coverage
#3238 CInt FFI exports do not use C int in _stub.h header file new lowest 7.6.2 Compiler (FFI)
#3321 -fhpc assumes original sources relative to the current directory new lowest 7.6.2 Compiler
#3351 Generated ghc man page missing xrefs new lowest 7.6.2 Documentation
#3376 hpc and CPP don't mix on Windows new andy@… lowest 7.6.2 Code Coverage
#3458 Allocation where none should happen new lowest 7.6.2 Compiler
#3470 OSX installer should give an informative error message when XCode is missing new lowest 7.6.2 Build System
#3509 libffi.so not found on Mac OS X (10.5.8) new lowest 7.6.2 Build System
#3533 mac installer package deletes old version of ghc new lowest 7.6.2 Compiler
#3543 -fext-core doesn't force recompilation when .hcr file doesn't exist new lowest 7.6.2 Driver
#3571 Bizzarely bloated binaries new lowest 7.6.2 Compiler
#3606 The Ord instance for unboxed arrays is very inefficient new lowest 7.10.1 libraries (other)
#4022 GHC Bindist is Broken on FreeBSD/amd64 new pgj lowest 7.6.2 libraries (other)
#8293 user001 spuriously fails if getGroupEntryForID correctly fails new lowest libraries/unix
#8369 Small improvements to ./sync-all new hvr lowest Trac & Git
#8403 Pretty-printing of long types new lowest Compiler
#8897 Can't change "Full Name" in preferences new hvr lowest Trac & Git
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