Issues · Glasgow Haskell Compiler / GHC

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2-fold memory usage regression GHC 8.2.2 -> GHC 8.4.1 compiling `mmark` package

#14974 · opened Mar 26, 2018 by Herbert Valerio Riedel 9.2.1 7 Phigh Trac import bug compiler perf
- 12
updated Mar 02, 2021
Refactor (Maybe Coercion)

#14975 · opened Mar 26, 2018 by Tobias Dammers 8.6.1 5 Pnormal Trac import task
- CLOSED
- 10
updated Jul 07, 2019
WebAssembly support

#14976 · opened Mar 26, 2018 by sven 3 Plow Trac import feature request
- 1
- 4
updated Jul 07, 2019
Clang doesn't support -Wsync-nand

#14977 · opened Mar 26, 2018 by Ben Gamari 8.6.1 7 Phigh Trac import bug
- CLOSED
- 6
updated Jul 07, 2019
GADTs don't seem to unpack properly

#14978 · opened Mar 26, 2018 by David Feuer 8.6.1 5 Pnormal Trac import bug runtime perf
- CLOSED
- 5
updated Jul 07, 2019
Issue warning is -main-is is used in OPTIONS pragma

#14979 · opened Mar 26, 2018 by Ben Gamari 5 Pnormal Trac import feature request
- 0
updated Jul 07, 2019
Runtime performance regression with binary operations on vectors

#14980 · opened Mar 27, 2018 by ttylec 9.2.1 7 Phigh Trac import bug runtime perf
- 34
updated Jan 23, 2021
GHC parallel GC is not doing well on modern many-core machine

#14981 · opened Mar 27, 2018 by varosi 5 Pnormal RTS Trac import bug
- 10
updated Jul 07, 2019
LLVM default -mcpu setting inhibits customization

#14982 · opened Mar 28, 2018 by Thomas Main DuBuisson 8.4.2 5 LLVM backend Pnormal Trac import bug
- 3
updated Jul 07, 2019
Have custom type errors imply Void

#14983 · opened Mar 29, 2018 by Icelandjack 0 Plow QuantifiedConstraints Trac import custom type errors task
- 3
updated Oct 30, 2020
Regression: 8.4.1 says "Could not deduce" when before 8.4 it could

#14984 · opened Mar 29, 2018 by erikd 5 Pnormal Trac import bug typechecker
- CLOSED
- 2
updated Jul 07, 2019
GHC flags missing from the user guide flag reference.

#14985 · opened Mar 29, 2018 by Merijn Verstraaten 5 Pnormal Trac import bug documentation
- 0
updated Feb 07, 2021
CmmCommonBlockElim conflicts with GhcEnableTablesNextToCode=NO

#14986 · opened Mar 30, 2018 by Cheng Shao 5 Pnormal Trac import bug ghc build failure
- CLOSED
- 5
updated Jul 07, 2019
Memory usage exploding for complex pattern matching

#14987 · opened Mar 30, 2018 by vmiraldo 5 Pnormal Trac import bug compiler crash compiler perf
- 18
updated May 02, 2020
Memory strain while compiling HLint

#14988 · opened Mar 30, 2018 by mcandre 5 Pnormal Trac import bug compiler perf
- 2
- 4
updated Sep 29, 2019
CBE pass 2 invalidates proc points

#14989 · opened Mar 31, 2018 by Sebastian Graf 5 Pnormal Trac import bug compiler crash
- CLOSED
- 10
updated Jul 07, 2019
"Valid refinement suggestions" have the wrong types

#14990 · opened Mar 31, 2018 by Richard Eisenberg 8.6.1 5 Pnormal Trac import bug
- CLOSED
- 10
updated Jul 07, 2019
GHC HEAD regression involving TYPEs in type families

#14991 · opened Apr 02, 2018 by Ryan Scott 8.6.1 7 Phigh Trac import TypeFamilies TypeInType bug typechecker
- CLOSED
- 5
updated Jul 07, 2019
Allow existentials to UNPACK

#14992 · opened Apr 02, 2018 by Simon Peyton Jones 5 Pnormal Trac import bug
- CLOSED
- 1
updated Jul 07, 2019
QuantifiedConstraints and principal types

#14993 · opened Apr 02, 2018 by Icelandjack 5 Pnormal Trac import task
- CLOSED
- 9
updated Jul 07, 2019
ghc api: `load LoadAllTargets` is not idempotent

#14994 · opened Apr 02, 2018 by Bertram Felgenhauer 8.8.1 7 GHC API Phigh Trac import bug
- CLOSED
- 5
updated Jul 07, 2019
QuantifiedConstraints: Incorrect pretty printing

#14995 · opened Apr 02, 2018 by Icelandjack 3 GHCi Plow QuantifiedConstraints Trac import bug error messages
- 3
updated Jul 07, 2019
Typed holes are very slow

#14996 · opened Apr 03, 2018 by Simon Peyton Jones 5 Pnormal Trac import bug typed holes
- CLOSED
- 5
updated Jul 07, 2019
mut_list_size calculation is off

#14997 · opened Apr 03, 2018 by Ömer Sinan Ağacan 0 Plow RTS Trac import bug
- 4
updated Jul 07, 2019
Sort out the strictness mess for exceptions

#14998 · opened Apr 04, 2018 by Simon Peyton Jones 8.10.1 5 Pnormal Trac import bug exceptions
- CLOSED
- 1
- 45
updated Mar 06, 2020
unwinding info for stg_catch_frame is wrong

#14999 · opened Apr 04, 2018 by niteria 8.4.3 5 Pnormal Trac import bug debug information
- CLOSED
- 4
updated Jul 07, 2019
Add a linter for debug information (-g)

#15000 · opened Apr 04, 2018 by niteria 5 Pnormal Trac import debug information feature request
- 2
updated Jul 07, 2019
Add strict product field demands to lambda binders

#15001 · opened Apr 04, 2018 by Sebastian Graf ⊥ 5 Pnormal Trac import task
- CLOSED
- 5
updated Jul 07, 2019
Panic: collectNBinders

#15002 · opened Apr 04, 2018 by Eric Crockett 8.4.2 10 Phighest Trac import bug compiler crash profiling
- CLOSED
- 16
updated Jul 07, 2019
Data.List documentation should list complexities of more functions

#15003 · opened Apr 05, 2018 by gershomb 8.4.3 5 Pnormal Trac import core libraries feature request newcomer
- CLOSED
- 2
updated Jul 07, 2019
Building HEAD fails with -j3 because of unrecorded dependencies.

#15004 · opened Apr 05, 2018 by Andreas Klebinger 5 Pnormal Trac import bug ghc build failure
- CLOSED
- 4
updated Jul 07, 2019
GHC fails with “StgCmmEnv: variable not found” when trying to compile order-maintenance-0.2.1.0

#15005 · opened Apr 05, 2018 by Wolfgang Jeltsch 8.4.2 5 Pnormal Trac import bug compiler crash
- CLOSED
- 13
updated Jul 07, 2019
User guide uses cnd.mathjax.org, which has shut down

#15006 · opened Apr 06, 2018 by lyxia 8.4.3 5 Pnormal Trac import bug documentation
- CLOSED
- 3
updated Jul 07, 2019
Don't keep shadowed variables in ghci, both renamer and type checker

#15007 · opened Apr 06, 2018 by Tao He 8.6.1 5 GHCi Pnormal Trac import bug error messages typed holes
- CLOSED
- 18
updated Jul 07, 2019
Type synonyms with hidden, determined type variables

#15008 · opened Apr 06, 2018 by Joachim Breitner Research needed 5 Pnormal Trac import feature request
- CLOSED
- 7
updated Jul 07, 2019
Float equalities past local equalities

#15009 · opened Apr 06, 2018 by Richard Eisenberg 8.4.3 5 Pnormal Trac import feature request
- CLOSED
- 20
updated Apr 30, 2020
Application (warp) server crashing periodically with "TSO object entered"

#15010 · opened Apr 06, 2018 by ramirez7 5 Phigh RTS Trac import bug info needed runtime crash
- 7
updated Jan 23, 2020
Automate update of VersionHistory table

#15011 · opened Apr 07, 2018 by Ben Gamari 5 Pnormal Trac import infrastructure task
- 3
updated Jan 23, 2020
"Iface type variable out of scope" when compiling with -c

#15012 · opened Apr 08, 2018 by Ryan Scott 8.6.1 5 Pnormal Trac import bug deriving
- CLOSED
- 4
updated Jul 07, 2019
Building nofib using llvm and HEAD fails

#15013 · opened Apr 08, 2018 by Andreas Klebinger ⊥ 5 LLVM backend Pnormal Trac import bug compiler crash
- CLOSED
- 3
updated Jul 07, 2019
Exhaustivity check should suggest when COMPLETE could be helpful

#15014 · opened Apr 08, 2018 by Edward Z. Yang 8.4.3 5 Pnormal PatternSynonyms Trac import bug error messages pattern match warnings typechecker
- 0
updated Jul 07, 2019
Parsing of exp_doc loses section markers

#15015 · opened Apr 09, 2018 by Levent Erkök 8.4.3 5 Pnormal Trac import bug parser
- 0
updated Jul 07, 2019
Referencing a do-bound variable in a rec block with ApplicativeDo results in variable not in scope during type checking

#15016 · opened Apr 09, 2018 by rjmk 8.4.3 7 ApplicativeDo Phigh Trac import bug
- 7
updated Jul 07, 2019
Come up with a better name for `tcExtendTyVarEnv2`

#15017 · opened Apr 09, 2018 by Matthew Pickering 8.6.1 5 Pnormal Trac import task
- CLOSED
- 3
updated Jul 07, 2019
Bump base's version number to 4.12.0.0 in HEAD

#15018 · opened Apr 09, 2018 by Ryan Scott 8.6.1 5 Pnormal Trac import bug
- CLOSED
- 17
updated Jul 07, 2019
Fix performance regressions from #14737

#15019 · opened Apr 09, 2018 by Tobias Dammers 9.2.1 7 Phigh Trac import bug compiler perf
- 26
updated Jan 23, 2021
PatternSynonyms: Problems with quantified constraints / foralls

#15020 · opened Apr 10, 2018 by Icelandjack 5 Pnormal PatternSynonyms QuantifiedConstraints Trac import bug
- 4
updated Jan 23, 2020
ghc-pkg list crashes on Windows when unicode character is in the path

#15021 · opened Apr 10, 2018 by Niklas Hambüchen 8.6.1 5 Pnormal Trac import bug ghc-pkg
- CLOSED
- 6
updated Jul 07, 2019
Stackage HEAD detected a suspicious change

#15022 · opened Apr 11, 2018 by mrkkrp 8.6.1 5 Pnormal Trac import bug
- CLOSED
- 14
updated Jul 07, 2019
GHC 8.4.1 bundles w/ phony `mtl-2.2.2` release

#15023 · opened Apr 11, 2018 by Herbert Valerio Riedel 8.4.2 10 Phighest Trac import bug
- CLOSED
- 1
updated Jul 07, 2019
ghc: please switch to llvm-toolchain-6.0

#15024 · opened Apr 11, 2018 by LocutusOfBorg 8.6.1 5 Pnormal Trac import feature request
- CLOSED
- 5
updated Jul 07, 2019
Lingering @since TODO Haddock annotations

#15025 · opened Apr 11, 2018 by Ryan Scott 8.4.2 7 Phigh Trac import bug documentation
- CLOSED
- 4
updated Jul 07, 2019
Type deduction panic

#15026 · opened Apr 11, 2018 by moomin 8.6.1 5 Pnormal Trac import bug error messages
- CLOSED
- 1
updated Jul 07, 2019
Remove WrappedMonad from Control.Applicative

#15027 · opened Apr 11, 2018 by Andrew Martin 8.6.1 5 Pnormal Trac import bug core libraries
- CLOSED
- 3
updated Jul 07, 2019
Deprecate and Remove Data.Semigroup.Option and Data.Monoid.First/Last

#15028 · opened Apr 12, 2018 by Andrew Martin 9.2.1 5 Pnormal Trac import core libraries task
- CLOSED
- 10
- 16
updated Feb 14, 2021
haddock parsing fails with valid input

#15029 · opened Apr 12, 2018 by Levent Erkök 5 Pnormal Trac import bug parser
- 5
updated Oct 29, 2020
Cabal Installation error in Windows 10 machine for Haskell

#15030 · opened Apr 12, 2018 by gavinnf 8.6.1 5 Pnormal Trac import bug
- CLOSED
- 3
updated Jul 07, 2019
[1,1..0] /= [1,1..2]

#15031 · opened Apr 12, 2018 by Sebastian Graf 8.6.1 5 Pnormal Trac import bug core libraries
- CLOSED
- 2
updated Jul 07, 2019
GHCi panics when attempting to load archives

#15032 · opened Apr 12, 2018 by vanessamchale 8.6.1 5 GHCi Pnormal Trac import bug
- CLOSED
- 6
updated Jul 07, 2019
ScopedTypeVariable and RankNTypes don't scope throughout function body

#15033 · opened Apr 14, 2018 by parsonsmatt 8.6.1 5 Pnormal Trac import bug
- CLOSED
- 1
updated Jul 07, 2019
Desugaring `mdo` moves a `let` where it shouldn't be

#15034 · opened Apr 14, 2018 by parsonsmatt 5 Pnormal RecursiveDo Trac import bug
- 6
updated Jan 23, 2020
Panic when using StaticPointers with typed holes

#15035 · opened Apr 14, 2018 by utdemir 8.6.1 5 Pnormal Trac import bug compiler crash typed holes
- CLOSED
- 1
updated Jul 07, 2019
STG Linter dies when linting primitive

#15036 · opened Apr 14, 2018 by Andrew Martin 8.6.1 5 Pnormal Trac import bug
- CLOSED
- 1
updated Jul 07, 2019
Running 1 twice, followed by a typed hole, in GHCi causes internal error

#15037 · opened Apr 14, 2018 by Ryan Scott 8.6.1 5 GHCi Pnormal Trac import bug compiler crash typed holes
- CLOSED
- 2
updated Jul 07, 2019
Memory Corruption (strange closure type)

#15038 · opened Apr 16, 2018 by Andrew Martin 8.4.3 10 Phighest Trac import bug
- CLOSED
- 41
updated Jul 07, 2019
Bizarre pretty-printing of inferred Coercible constraint in partial type signature

#15039 · opened Apr 16, 2018 by Ryan Scott 8.6.1 5 Pnormal Trac import TypeInType bug error messages partial type sigs typechecker
- CLOSED
- 9
updated Jul 07, 2019
DTrace enabled GHC does not work as a bootstrap compiler on FreeBSD

#15040 · opened Apr 16, 2018 by raichoo 8.6.1 5 Pnormal Trac import bug ghc build failure
- CLOSED
- 4
updated Jul 07, 2019
rnIfaceBndr implementation in RnModIface looks incorrect

#15041 · opened Apr 16, 2018 by Matthew Pickering 8.6.1 5 Pnormal Trac import backpack bug
- CLOSED
- 3
updated Jul 07, 2019
Bump unix's version number to 2.8.0.0 in HEAD

#15042 · opened Apr 16, 2018 by Ryan Scott 8.6.1 5 Pnormal Trac import bug
- CLOSED
- 6
updated Jul 07, 2019
A more aggressive version of -fprint-expanded-synonyms that prints all type synonyms

#15043 · opened Apr 16, 2018 by Domen Kožar 5 Pnormal Trac import feature request typechecker
- 13
updated Jan 23, 2020
Option to output instance resolution process

#15044 · opened Apr 16, 2018 by lyxia 5 Pnormal Trac import feature request
- 5
updated Jan 23, 2020
Remove broken top-level shell.nix

#15045 · opened Apr 16, 2018 by Matthew Pickering 8.6.1 5 Pnormal Trac import task
- CLOSED
- 2
updated Jul 07, 2019
Broken links on haskell.org/ghc

#15046 · opened Apr 17, 2018 by Artem Pelenitsyn ⊥ 5 Pnormal Trac import bug infrastructure
- CLOSED
- 2
updated Jul 07, 2019
Outdated comments in RnSource.hs

#15047 · opened Apr 17, 2018 by Artem Pelenitsyn 8.6.1 5 Pnormal Trac import bug typechecker
- CLOSED
- 1
updated Jul 07, 2019
Fix mirroring of terminfo and haskeline

#15048 · opened Apr 17, 2018 by Ben Gamari 8.10.1 5 Pnormal Trac import infrastructure task
- CLOSED
- 5
updated Jul 07, 2019
NUMA not detected on Win10 with AMD Ryzen Threadripper

#15049 · opened Apr 17, 2018 by kanetw 8.6.1 5 Pnormal RTS Trac import bug
- CLOSED
- 5
updated Jul 07, 2019
ScopedTypeVariables could allow more programs

#15050 · opened Apr 17, 2018 by Joachim Breitner 8.8.1 5 Pnormal ScopedTypeVariables Trac import feature request
- CLOSED
- 22
updated Aug 19, 2020
-split-objs generates excessively many files on Windows

#15051 · opened Apr 17, 2018 by kanetw 8.6.1 10 Phighest Trac import bug
- CLOSED
- 14
updated Jul 07, 2019
DeriveAnyClass instances may skip TypeError constraints

#15052 · opened Apr 18, 2018 by Daniel Gorín 8.6.1 5 Pnormal Trac import bug custom type errors
- CLOSED
- 14
updated Jul 07, 2019
Compiler panic on invalid syntax (unterminated pragma)

#15053 · opened Apr 18, 2018 by Andreas Klebinger 8.6.2 5 Pnormal Trac import bug compiler crash parser
- CLOSED
- 7
updated Jul 07, 2019
ghc internal error appeared in GHCI

#15054 · opened Apr 19, 2018 by radrow 5 GHCi Pnormal Trac import bug debugger
- 11
updated Feb 19, 2021
ghci - improve error on hidden package

#15055 · opened Apr 19, 2018 by Alexander Kjeldaas 8.6.1 5 GHCi Pnormal Trac import bug newcomer
- CLOSED
- 6
updated Jul 07, 2019
Wrappers inlined too late

#15056 · opened Apr 19, 2018 by Simon Peyton Jones 5 Pnormal Trac import bug simplifier
- 5
updated Jan 23, 2020
Lint types created by newFamInst

#15057 · opened Apr 19, 2018 by Ryan Scott 8.6.1 5 Pnormal Trac import TypeFamilies bug
- CLOSED
- 7
updated Jul 07, 2019
scc001 unexpected passes in prof way on CircleCI

#15058 · opened Apr 19, 2018 by Ben Gamari 8.6.1 7 CI breakage Phigh Trac import bug
- CLOSED
- 7
updated Jul 07, 2019
ghcpkg05 fails

#15059 · opened Apr 19, 2018 by Ben Gamari 8.8.1 7 CI breakage Phigh Trac import bug testsuite
- CLOSED
- 3
updated Jul 07, 2019
outofmem testcase sometimes crashes on i386

#15060 · opened Apr 19, 2018 by Ben Gamari 8.6.1 5 CI breakage Pnormal RTS Trac import bug
- CLOSED
- 3
updated Jul 07, 2019
print022 testcase fails on i386

#15061 · opened Apr 19, 2018 by Ben Gamari 8.6.1 10 CI breakage GHCi Phighest Trac import bug
- CLOSED
- 1
- 6
updated Jul 07, 2019
num009 is incredibly platform-sensitive

#15062 · opened Apr 19, 2018 by Ben Gamari 8.6.1 7 CI breakage Phigh Trac import broken test bug testsuite
- CLOSED
- 6
updated Jul 07, 2019
T3001-2 fails on i386 Linux

#15063 · opened Apr 19, 2018 by Ben Gamari 8.6.1 7 CI breakage Phigh Trac import bug profiling
- CLOSED
- 7
updated Jul 07, 2019
T8089 mysteriously fails when GHC is built with LLVM

#15064 · opened Apr 19, 2018 by Ben Gamari 8.8.1 10 CI breakage LLVM backend Phighest Trac import bug
- CLOSED
- 4
updated Aug 10, 2019
T12903(profasm) produces a heap profile with out of sequence samples

#15065 · opened Apr 19, 2018 by Alp Mestanogullari 5 Pnormal Trac import bug profiling
- CLOSED
- 3
updated Jul 07, 2019
EtaExpandLevPoly triggers a core lint error in profasm/profthreaded ways

#15066 · opened Apr 19, 2018 by Alp Mestanogullari 8.8.1 5 Pnormal Trac import bug
- CLOSED
- 2
updated Jul 07, 2019
When Typeable and unboxed sums collide, GHC panics

#15067 · opened Apr 20, 2018 by Ryan Scott 8.6.1 5 Pnormal Trac import Typeable UnboxedSums bug
- CLOSED
- 4
updated Jul 07, 2019
Small number of test case failures on Ubuntu Bionic (GCC 7.3)

#15068 · opened Apr 20, 2018 by jrp2014 8.4.3 10 Phighest Trac import bug code generation incorrect runtime result
- CLOSED
- 37
updated Jul 07, 2019
Missed SpecConstr opportunity

#15069 · opened Apr 20, 2018 by Simon Peyton Jones 5 Pnormal SpecConstr Trac import bug
- 2
updated Jan 23, 2020
postInlineUnconditionally is too eager

#15070 · opened Apr 20, 2018 by Simon Peyton Jones 5 Pnormal Trac import bug
- 2
updated Jan 23, 2020
:set usage in ghci tests breaks platform independence of output

#15071 · opened Apr 20, 2018 by Ben Gamari 8.8.1 7 CI breakage Phigh Trac import bug testsuite
- CLOSED
- 6
updated Jul 07, 2019
Teach the testsuite driver about response files

#15072 · opened Apr 20, 2018 by Ben Gamari 5 CI breakage Pnormal Trac import task
- 11
updated Jan 23, 2020
Unable to newtype derive `Prim` via DerivingStrategies

#15073 · opened Apr 20, 2018 by fosskers 8.6.1 5 Pnormal Trac import bug deriving
- CLOSED
- 9
updated Jul 07, 2019