[GHC] #15108: Panic: collectNBinders
GHC
ghc-devs at haskell.org
Mon Apr 30 22:48:52 UTC 2018
#15108: Panic: collectNBinders
-------------------------------------+-------------------------------------
Reporter: cdisselkoen | Owner: (none)
Type: bug | Status: new
Priority: normal | Milestone:
Component: Profiling | Version: 8.4.2
Keywords: panic | Operating System: Linux
collectNBinders |
Architecture: | Type of failure: Compile-time
Unknown/Multiple | crash or panic
Test Case: | Blocked By:
Blocking: | Related Tickets:
Differential Rev(s): | Wiki Page:
-------------------------------------+-------------------------------------
GHC 8.4.2 panics with the error message `collectNBinders`, when compiling
with profiling. This is a very similar bug to #15002, but although #15002
is fixed in 8.4.2, this panic persists.
Steps to reproduce:
`stack.yaml`:
{{{
resolver: nightly-2018-04-30
}}}
`bug.cabal`:
{{{
name: bug
version: 0.1.0.0
build-type: Simple
cabal-version: >=1.10
library
build-depends: base
default-language: Haskell2010
executable bug
main-is: Main.hs
build-depends: base
, bug
default-language: Haskell2010
}}}
`Main.hs`:
{{{
module Main where
main :: IO ()
main = do
_ <- return $ getInt Circle
return ()
newtype MyInt = MyInt Int
data Shape = Circle
| Square
getInt :: Shape -> MyInt
getInt sh =
case sh of
Circle ->
let (MyInt i) = MyInt 3
in myInt i
Square ->
let (MyInt i) = MyInt 2
in myInt i
where
myInt = MyInt
}}}
Then run:
{{{
$ stack ghc -- --version
The Glorious Glasgow Haskell Compilation System, version 8.4.2
$ stack build --profile
bug-0.1.0.0: build (lib + exe)
Preprocessing library for bug-0.1.0.0..
Building library for bug-0.1.0.0..
Preprocessing executable 'bug' for bug-0.1.0.0..
Building executable 'bug' for bug-0.1.0.0..
[1 of 1] Compiling Main ( Main.hs, .stack-work/dist/x86_64
-linux-tinfo6-nopie/Cabal-2.2.0.1/build/bug/bug-tmp/Main.p_o )
ghc: panic! (the 'impossible' happened)
(GHC version 8.4.2 for x86_64-unknown-linux):
collectNBinders
1
Call stack:
CallStack (from HasCallStack):
callStackDoc, called at compiler/utils/Outputable.hs:1150:37 in
ghc:Outputable
pprPanic, called at compiler/coreSyn/CoreSyn.hs:2025:25 in
ghc:CoreSyn
Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug
-- While building custom Setup.hs for package bug-0.1.0.0 using:
/usr/local/home/<USER>/.stack/setup-exe-cache/x86_64-linux-
tinfo6-nopie/Cabal-simple_mPHDZzAJ_2.2.0.1_ghc-8.4.2 --builddir=.stack-
work/dist/x86_64-linux-tinfo6-nopie/Cabal-2.2.0.1 build lib:bug exe:bug
--ghc-options " -ddump-hi -ddump-to-file -fdiagnostics-color=always"
Process exited with code: ExitFailure 1
}}}
--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15108>
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