ghc-mod crashes when checking template haskell sources
bonds opened this issue · 4 comments
bonds commented
ghc-mod crashes whenever I try to check a template haskell source file. I can repro it on a vanilla stack project just by adding the template haskell pragma to Main.hs:
~/src ❯❯❯ stack new --resolver lts-6 blue Sun 2017-04-09 20:27:59 -0700
Downloading template "new-template" to create project "blue" in blue/ ...
The following parameters were needed by the template but not provided: author-email, author-name, category, copyright, github-username
You can provide them in /home/scott/.stack/config.yaml, like this:
templates:
params:
author-email: value
author-name: value
category: value
copyright: value
github-username: value
Or you can pass each one as parameters like this:
stack new blue new-template -p "author-email:value" -p "author-name:value" -p "category:value" -p "copyright:value" -p "github-username:value"
Looking for .cabal or package.yaml files to use to init the project.
Using cabal packages:
- blue/blue.cabal
Selected resolver: lts-6.31
Selected resolver: lts-6.31
Downloaded lts-6.31 build plan.
Fetching package index ...remote: Counting objects: 4161, done.
remote: Compressing objects: 100% (3241/3241), done.
remote: Total 4161 (delta 1141), reused 3429 (delta 821), pack-reused 0
Receiving objects: 100% (4161/4161), 1.26 MiB | 762.00 KiB/s, done.
Resolving deltas: 100% (1141/1141), completed with 519 local objects.
From https://github.com/commercialhaskell/all-cabal-hashes
- [tag update] current-hackage -> current-hackage
Fetched package index.
Populated index cache.
Did not find .cabal file for feed-0.3.12.0 with Git SHA of 79ca07db28d5e5b22682b49d5984f921870a0f17
Right Nothing
Initialising configuration using resolver: lts-6.31
Total number of user packages considered: 1
Writing configuration to file: blue/stack.yaml
All done.
~/src ❯❯❯ cd blue Sun 2017-04-09 20:29:14 -0700
~/s/blue ❯❯❯ ls Sun 2017-04-09 20:30:23 -0700
LICENSE README.md Setup.hs app blue.cabal src stack.yaml test
~/s/blue ❯❯❯ ghc-mod check app/Main.hs Sun 2017-04-09 20:30:24 -0700
blue-0.1.0.0: configure
Configuring blue-0.1.0.0...
~/s/blue ❯❯❯ vim app/Main.hs Sun 2017-04-09 20:30:41 -0700
~/s/blue ❯❯❯ ghc-mod check app/Main.hs Sun 2017-04-09 20:31:14 -0700
fish: Job 1, 'ghc-mod check app/Main.hs' terminated by signal SIGABRT (Abort)
~/s/blue [1] ❯❯❯ ghc-mod check app/Main.hs --verbose 7 Sun 2017-04-09 20:31:33 -0700
DEBUG: reading cache: /home/scott/src/blue/.stack-work/dist/x86_64-openbsd/Cabal-1.22.5.0/setup-config.ghc-mod.cabal-components
DEBUG: resolveEntrypoint:
["-i","-i.stack-work/dist/x86_64-openbsd/Cabal-1.22.5.0/build","-isrc","-i.stack-work/dist/x86_64-openbsd/Cabal-1.22.5.0/build/autogen","-I.stack-work/dist/x86_64-openbsd/Cabal-1.22.5.0/build/autogen","-I.stack-work/dist/x86_64-openbsd/Cabal-1.22.5.0/build","-optP-include","-optP.stack-work/dist/x86_64-openbsd/Cabal-1.22.5.0/build/autogen/cabal_macros.h"]
DEBUG: resolveEntrypoint:
["-i","-i.stack-work/dist/x86_64-openbsd/Cabal-1.22.5.0/build/blue-exe/blue-exe-tmp","-iapp","-i.stack-work/dist/x86_64-openbsd/Cabal-1.22.5.0/build/autogen","-I.stack-work/dist/x86_64-openbsd/Cabal-1.22.5.0/build/autogen","-I.stack-work/dist/x86_64-openbsd/Cabal-1.22.5.0/build/blue-exe/blue-exe-tmp","-optP-include","-optP.stack-work/dist/x86_64-openbsd/Cabal-1.22.5.0/build/autogen/cabal_macros.h"]
DEBUG: resolveEntrypoint:
["-i","-i.stack-work/dist/x86_64-openbsd/Cabal-1.22.5.0/build/blue-test/blue-test-tmp","-itest","-i.stack-work/dist/x86_64-openbsd/Cabal-1.22.5.0/build/autogen","-I.stack-work/dist/x86_64-openbsd/Cabal-1.22.5.0/build/autogen","-I.stack-work/dist/x86_64-openbsd/Cabal-1.22.5.0/build/blue-test/blue-test-tmp","-optP-include","-optP.stack-work/dist/x86_64-openbsd/Cabal-1.22.5.0/build/autogen/cabal_macros.h"]
DEBUG: resolveEntrypoint: []
DEBUG: making sure autogen files exist
DEBUG: reading cache: .stack-work/dist/x86_64-openbsd/Cabal-1.22.5.0/setup-config.ghc-mod.resolved-components
VOMIT: Initializing GHC session with following options: "-fbuilding-cabal-package" "-O" "-outputdir" ".stack-work/dist/x86_64-openbsd/Cabal-1.22.5.0/build" "-odir" ".stack-work/dist/x86_64-openbsd/Cabal-1.22.5.0/build" "-hidir" ".stack-work/dist/x86_64-openbsd/Cabal-1.22.5.0/build" "-stubdir" ".stack-work/dist/x86_64-openbsd/Cabal-1.22.5.0/build" "-i" "-i.stack-work/dist/x86_64-openbsd/Cabal-1.22.5.0/build/blue-exe/blue-exe-tmp" "-iapp" "-i.stack-work/dist/x86_64-openbsd/Cabal-1.22.5.0/build" "-isrc" "-i.stack-work/dist/x86_64-openbsd/Cabal-1.22.5.0/build/autogen" "-I.stack-work/dist/x86_64-openbsd/Cabal-1.22.5.0/build/blue-exe/blue-exe-tmp" "-I.stack-work/dist/x86_64-openbsd/Cabal-1.22.5.0/build/autogen" "-I.stack-work/dist/x86_64-openbsd/Cabal-1.22.5.0/build" "-optP-include" "-optP.stack-work/dist/x86_64-openbsd/Cabal-1.22.5.0/build/autogen/cabal_macros.h" "-hide-all-packages" "-no-user-package-db" "-package-db" "/home/scott/.stack/snapshots/x86_64-openbsd/lts-6.31/7.10.3/pkgdb" "-package-db" "/home/scott/src/blue/.stack-work/install/x86_64-openbsd/lts-6.31/7.10.3/pkgdb" "-package-id" "base-4.8.2.0-8dd7859ce039df9f3d3f4ff9dbf4bb93" "-XHaskell2010" "-threaded" "-rtsopts" "-with-rtsopts=-N" "-O0"
DEBUG: initSession: Session not initialized, creating new one
DEBUG: loadTargets: Loading: app/Main.hs
info: loadTargets:
Target needs interpeter, switching to LinkInMemory/HscInterpreted. Perfectly normal if anything isusing TemplateHaskell, QuasiQuotes or PatternSynonyms.
fish: Job 1, 'ghc-mod check app/Main.hs --ver…' terminated by signal SIGABRT (Abort)
~/s/blue [134] ❯❯❯ gdb (which ghc-mod) ghc-mod.core Sun 2017-04-09 20:31:37 -0700
GNU gdb 6.3
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB. Type "show warranty" for details.
This GDB was configured as "amd64-unknown-openbsd6.0"...(no debugging symbols found)
Core was generated by `ghc-mod'.
Program terminated with signal 6, Aborted.
Reading symbols from /usr/lib/libpthread.so.22.0...done.
Loaded symbols for /usr/lib/libpthread.so.22.0
Reading symbols from /usr/lib/libutil.so.12.1...done.
Loaded symbols for /usr/lib/libutil.so.12.1
Symbols already loaded for /usr/lib/libpthread.so.22.0
Reading symbols from /usr/local/lib/libiconv.so.6.0...done.
Loaded symbols for /usr/local/lib/libiconv.so.6.0
Reading symbols from /usr/lib/libm.so.9.0...done.
Loaded symbols for /usr/lib/libm.so.9.0
Reading symbols from /usr/lib/libc.so.88.0...done.
Loaded symbols for /usr/lib/libc.so.88.0
Reading symbols from /usr/libexec/ld.so...done.
Loaded symbols for /usr/libexec/ld.so
#0 0x00000002e2ac46ea in _thread_sys___syscall () at <stdin>:2
2 <stdin>: No such file or directory.
in <stdin>
(gdb) bt
#0 0x00000002e2ac46ea in _thread_sys___syscall () at <stdin>:2
#1 0x00000002e2ae056a in *_libc_mmap (addr=Variable "addr" is not available.
) at /usr/src/lib/libc/sys/mmap.c:47
#2 0x000000000450f0a4 in obscure_ccall_ret_code ()
#3 0x000000000450fad9 in obscure_ccall_ret_code ()
#4 0x0000000002d50046 in ?? ()
#5 0x000000000000000a in ?? ()
#6 0x000000000000000b in ?? ()
#7 0x0000000000000000 in ?? ()
Current language: auto; currently asm
(gdb) ⏎~
~/s/blue ❯❯❯ ghc-mod debug Sun 2017-04-09 20:34:51 -0700
Root directory: /home/scott/src/blue
Current directory: /home/scott/src/blue
GHC Package flags:
-fbuilding-cabal-package -O -outputdir
.stack-work/dist/x86_64-openbsd/Cabal-1.22.5.0/build -odir
.stack-work/dist/x86_64-openbsd/Cabal-1.22.5.0/build -hidir
.stack-work/dist/x86_64-openbsd/Cabal-1.22.5.0/build -stubdir
.stack-work/dist/x86_64-openbsd/Cabal-1.22.5.0/build -i
-i.stack-work/dist/x86_64-openbsd/Cabal-1.22.5.0/build -isrc
-i.stack-work/dist/x86_64-openbsd/Cabal-1.22.5.0/build/autogen
-I.stack-work/dist/x86_64-openbsd/Cabal-1.22.5.0/build/autogen
-I.stack-work/dist/x86_64-openbsd/Cabal-1.22.5.0/build
-optP-include
-optP.stack-work/dist/x86_64-openbsd/Cabal-1.22.5.0/build/autogen/cabal_macros.h
-hide-all-packages -no-user-package-db -package-db
/home/scott/.stack/snapshots/x86_64-openbsd/lts-6.31/7.10.3/pkgdb
-package-db
/home/scott/src/blue/.stack-work/install/x86_64-openbsd/lts-6.31/7.10.3/pkgdb
-package-id base-4.8.2.0-8dd7859ce039df9f3d3f4ff9dbf4bb93
-XHaskell2010
GHC System libraries: /usr/local/lib/ghc
GHC user options:
Stack ghc executable: Just "/usr/local/bin/ghc"
Stack ghc-pkg executable:Just "/usr/local/bin/ghc-pkg"
Cabal file: Just "/home/scott/src/blue/blue.cabal"
Project: StackProject (StackEnv {seDistDir = ".stack-work/dist/x86_64-openbsd/Cabal-1.22.5.0", seBinPath = ["/home/scott/.stack/snapshots/x86_64-openbsd/lts-6.31/7.10.3/bin","/home/scott/bin","/home/scott/.local/bin","/home/scott/.gocode/bin","/home/scott/.cabal/bin","/home/scott/.gem/ruby/2.3/bin","/usr/local/sbin","/home/scott/.fzf/bin","/home/scott/bin","/home/scott/.local/bin","/home/scott/.gocode/bin","/home/scott/.cabal/bin","/home/scott/.gem/ruby/2.3/bin","/usr/local/sbin","/home/scott/.stack/global-project/.stack-work/install/x86_64-openbsd/lts-6.30/7.10.3/bin","/home/scott/.stack/snapshots/x86_64-openbsd/lts-6.30/7.10.3/bin","/bin","/usr/bin","/sbin","/usr/sbin","/usr/X11R6/bin","/usr/local/bin","/usr/local/sbin","/usr/games","/usr/games"], seSnapshotPkgDb = "/home/scott/.stack/snapshots/x86_64-openbsd/lts-6.31/7.10.3/pkgdb", seLocalPkgDb = "/home/scott/src/blue/.stack-work/install/x86_64-openbsd/lts-6.31/7.10.3/pkgdb"})
Cabal entrypoints:
Setup.hs
Main (/home/scott/src/blue/Setup.hs)
library
Lib (/home/scott/src/blue/src/Lib.hs)
exe:blue-exe
Main (/home/scott/src/blue/app/Main.hs)
test:blue-test
Main (/home/scott/src/blue/test/Spec.hs)
Cabal components:
Setup.hs
Main (/home/scott/src/blue/Setup.hs)
library
Lib (/home/scott/src/blue/src/Lib.hs)
exe:blue-exe
Main (/home/scott/src/blue/app/Main.hs)
test:blue-test
Main (/home/scott/src/blue/test/Spec.hs)
GHC Cabal options:
Setup.hs
library
-fbuilding-cabal-package -O -outputdir
.stack-work/dist/x86_64-openbsd/Cabal-1.22.5.0/build -odir
.stack-work/dist/x86_64-openbsd/Cabal-1.22.5.0/build -hidir
.stack-work/dist/x86_64-openbsd/Cabal-1.22.5.0/build -stubdir
.stack-work/dist/x86_64-openbsd/Cabal-1.22.5.0/build -i
-i.stack-work/dist/x86_64-openbsd/Cabal-1.22.5.0/build -isrc
-i.stack-work/dist/x86_64-openbsd/Cabal-1.22.5.0/build/autogen
-I.stack-work/dist/x86_64-openbsd/Cabal-1.22.5.0/build/autogen
-I.stack-work/dist/x86_64-openbsd/Cabal-1.22.5.0/build
-optP-include
-optP.stack-work/dist/x86_64-openbsd/Cabal-1.22.5.0/build/autogen/cabal_macros.h
-hide-all-packages -no-user-package-db -package-db
/home/scott/.stack/snapshots/x86_64-openbsd/lts-6.31/7.10.3/pkgdb
-package-db
/home/scott/src/blue/.stack-work/install/x86_64-openbsd/lts-6.31/7.10.3/pkgdb
-package-id base-4.8.2.0-8dd7859ce039df9f3d3f4ff9dbf4bb93
-XHaskell2010
exe:blue-exe
-fbuilding-cabal-package -O -outputdir
.stack-work/dist/x86_64-openbsd/Cabal-1.22.5.0/build -odir
.stack-work/dist/x86_64-openbsd/Cabal-1.22.5.0/build -hidir
.stack-work/dist/x86_64-openbsd/Cabal-1.22.5.0/build -stubdir
.stack-work/dist/x86_64-openbsd/Cabal-1.22.5.0/build -i
-i.stack-work/dist/x86_64-openbsd/Cabal-1.22.5.0/build/blue-exe/blue-exe-tmp
-iapp -i.stack-work/dist/x86_64-openbsd/Cabal-1.22.5.0/build -isrc
-i.stack-work/dist/x86_64-openbsd/Cabal-1.22.5.0/build/autogen
-I.stack-work/dist/x86_64-openbsd/Cabal-1.22.5.0/build/blue-exe/blue-exe-tmp
-I.stack-work/dist/x86_64-openbsd/Cabal-1.22.5.0/build/autogen
-I.stack-work/dist/x86_64-openbsd/Cabal-1.22.5.0/build
-optP-include
-optP.stack-work/dist/x86_64-openbsd/Cabal-1.22.5.0/build/autogen/cabal_macros.h
-hide-all-packages -no-user-package-db -package-db
/home/scott/.stack/snapshots/x86_64-openbsd/lts-6.31/7.10.3/pkgdb
-package-db
/home/scott/src/blue/.stack-work/install/x86_64-openbsd/lts-6.31/7.10.3/pkgdb
-package-id base-4.8.2.0-8dd7859ce039df9f3d3f4ff9dbf4bb93
-XHaskell2010 -threaded -rtsopts -with-rtsopts=-N
test:blue-test
-fbuilding-cabal-package -O -outputdir
.stack-work/dist/x86_64-openbsd/Cabal-1.22.5.0/build -odir
.stack-work/dist/x86_64-openbsd/Cabal-1.22.5.0/build -hidir
.stack-work/dist/x86_64-openbsd/Cabal-1.22.5.0/build -stubdir
.stack-work/dist/x86_64-openbsd/Cabal-1.22.5.0/build -i
-i.stack-work/dist/x86_64-openbsd/Cabal-1.22.5.0/build/blue-test/blue-test-tmp
-itest -i.stack-work/dist/x86_64-openbsd/Cabal-1.22.5.0/build -isrc
-i.stack-work/dist/x86_64-openbsd/Cabal-1.22.5.0/build/autogen
-I.stack-work/dist/x86_64-openbsd/Cabal-1.22.5.0/build/blue-test/blue-test-tmp
-I.stack-work/dist/x86_64-openbsd/Cabal-1.22.5.0/build/autogen
-I.stack-work/dist/x86_64-openbsd/Cabal-1.22.5.0/build
-optP-include
-optP.stack-work/dist/x86_64-openbsd/Cabal-1.22.5.0/build/autogen/cabal_macros.h
-hide-all-packages -no-user-package-db -package-db
/home/scott/.stack/snapshots/x86_64-openbsd/lts-6.31/7.10.3/pkgdb
-package-db
/home/scott/src/blue/.stack-work/install/x86_64-openbsd/lts-6.31/7.10.3/pkgdb
-package-id base-4.8.2.0-8dd7859ce039df9f3d3f4ff9dbf4bb93
-XHaskell2010 -threaded -rtsopts -with-rtsopts=-N
GHC search path options:
Setup.hs
library
-i -i.stack-work/dist/x86_64-openbsd/Cabal-1.22.5.0/build -isrc
-i.stack-work/dist/x86_64-openbsd/Cabal-1.22.5.0/build/autogen
-I.stack-work/dist/x86_64-openbsd/Cabal-1.22.5.0/build/autogen
-I.stack-work/dist/x86_64-openbsd/Cabal-1.22.5.0/build
-optP-include
-optP.stack-work/dist/x86_64-openbsd/Cabal-1.22.5.0/build/autogen/cabal_macros.h
exe:blue-exe
-i
-i.stack-work/dist/x86_64-openbsd/Cabal-1.22.5.0/build/blue-exe/blue-exe-tmp
-iapp
-i.stack-work/dist/x86_64-openbsd/Cabal-1.22.5.0/build/autogen
-I.stack-work/dist/x86_64-openbsd/Cabal-1.22.5.0/build/autogen
-I.stack-work/dist/x86_64-openbsd/Cabal-1.22.5.0/build/blue-exe/blue-exe-tmp
-optP-include
-optP.stack-work/dist/x86_64-openbsd/Cabal-1.22.5.0/build/autogen/cabal_macros.h
test:blue-test
-i
-i.stack-work/dist/x86_64-openbsd/Cabal-1.22.5.0/build/blue-test/blue-test-tmp
-itest
-i.stack-work/dist/x86_64-openbsd/Cabal-1.22.5.0/build/autogen
-I.stack-work/dist/x86_64-openbsd/Cabal-1.22.5.0/build/autogen
-I.stack-work/dist/x86_64-openbsd/Cabal-1.22.5.0/build/blue-test/blue-test-tmp
-optP-include
-optP.stack-work/dist/x86_64-openbsd/Cabal-1.22.5.0/build/autogen/cabal_macros.h
~
~/s/blue ❯❯❯ cat app/Main.hs Sun 2017-04-09 20:36:57 -0700
{-# LANGUAGE TemplateHaskell #-}
module Main where
import Lib
main :: IO ()
main = someFunc
DanielG commented
Looks like a GHC crash to me. Please try loading the Main file with the testcase below. It expects the Main module to be in Main.hs in CWD. You might have to setup the load path which you can do by just passing GHC options to it on the command line.
GhcTestcase.hs:
-- $ ghc -package ghc -package ghc-paths GhcTestcase.hs
module Main where
import GHC
import GHC.Paths (libdir)
import DynFlags
import System.Environment
main :: IO ()
main = do
args <- getArgs
defaultErrorHandler defaultFatalMessager defaultFlushOut $
runGhc (Just libdir) $ do
dflags0 <- getSessionDynFlags
let dflags1 = dflags0 {
ghcMode = CompManager
, ghcLink = LinkInMemory
, hscTarget = HscInterpreted
, optLevel = 0
}
(dflags2, _, _) <- parseDynamicFlags dflags1 (map noLoc args)
_ <- setSessionDynFlags dflags2
target <- guessTarget "Main.hs" Nothing
setTargets [target]
_ <- load LoadAllTargets
setContext [IIModule $ mkModuleName "Main"]
return ()
bonds commented
Ok, I tried running that, here's what I got:
~/s/b/app ❯❯❯ ~/Downloads/GhcTestcase Tue 2017-04-11 10:21:33 -0700
fish: '~/Downloads/GhcTestcase' terminated by signal SIGABRT (Abort)
~/s/b/app [134] ❯❯❯ ls Tue 2017-04-11 10:21:36 -0700
GhcTestcase.core Main.hs
~/s/b/app ❯❯❯ gdb ~/Downloads/GhcTestcase GhcTestcase.core Tue 2017-04-11 10:21:50 -0700
GNU gdb 6.3
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB. Type "show warranty" for details.
This GDB was configured as "amd64-unknown-openbsd6.0"...
Core was generated by `GhcTestcase'.
Program terminated with signal 6, Aborted.
Reading symbols from /usr/lib/libpthread.so.22.0...done.
Loaded symbols for /usr/lib/libpthread.so.22.0
Reading symbols from /usr/lib/libutil.so.12.1...done.
Loaded symbols for /usr/lib/libutil.so.12.1
Symbols already loaded for /usr/lib/libpthread.so.22.0
Reading symbols from /usr/local/lib/libiconv.so.6.0...done.
Loaded symbols for /usr/local/lib/libiconv.so.6.0
Reading symbols from /usr/lib/libm.so.9.0...done.
Loaded symbols for /usr/lib/libm.so.9.0
Reading symbols from /usr/lib/libc.so.88.0...done.
Loaded symbols for /usr/lib/libc.so.88.0
Reading symbols from /usr/libexec/ld.so...done.
Loaded symbols for /usr/libexec/ld.so
#0 0x000000023c7866ea in _thread_sys___syscall () at <stdin>:2
2 <stdin>: No such file or directory.
in <stdin>
(gdb) bt
#0 0x000000023c7866ea in _thread_sys___syscall () at <stdin>:2
#1 0x000000023c7a256a in *_libc_mmap (addr=Variable "addr" is not available.
) at /usr/src/lib/libc/sys/mmap.c:47
#2 0x0000000002fc4154 in mmapForLinker (bytes=Variable "bytes" is not available.
) at rts/Linker.c:2248
#3 0x0000000002fc4b51 in loadObj (
path=0x2e9724b80 "/usr/local/lib/ghc/ghcpr_8TmvWUcS1U1IKHT0levwg3/HSghc-prim-0.4.0.0-8TmvWUcS1U1IKHT0levwg3.o") at rts/Linker.c:3033
#4 0x0000000001229696 in c50R_info ()
#5 0x0000000000000000 in ?? ()
Current language: auto; currently asm
(gdb) ⏎
~/s/b/app ❯❯❯ cat Main.hs Tue 2017-04-11 10:22:15 -0700
{-# LANGUAGE TemplateHaskell #-}
module Main where
main :: IO ()
main = putStrLn "hello, world"
FWIW, Main.hs builds and runs fine:
~/s/b/app ❯❯❯ ghc Main.hs Tue 2017-04-11 10:23:28 -0700
[1 of 1] Compiling Main ( Main.hs, Main.o )
Linking Main ...
/usr/local/lib/ghc/rts/libHSrts.a(RtsUtils.o): In function `showStgWord64':
rts/RtsUtils.c:204:0:
warning: warning: sprintf() is often misused, please use snprintf()
/usr/local/lib/ghc/rts/libHSrts.a(RtsFlags.o): In function `copyArg':
rts/RtsFlags.c:1685:0:
warning: warning: strcpy() is almost always misused, please use strlcpy()
~/s/b/app ❯❯❯ ls Tue 2017-04-11 10:25:54 -0700
GhcTestcase.core Main Main.hi Main.hs Main.o
~/s/b/app ❯❯❯ ./Main Tue 2017-04-11 10:26:01 -0700
hello, world
DanielG commented
Yeah thats a GHC bug then. You should report this bug over here: https://ghc.haskell.org/trac/ghc/wiki/ReportABug.
bonds commented
Done, thanks! Here's the new ticket: https://ghc.haskell.org/trac/ghc/ticket/13574#ticket