[GHC] #13708: Panic! (the "impossible" happened) bug in GHC 8.2.1 rc2
GHC
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Wed May 17 13:37:53 UTC 2017
#13708: Panic! (the "impossible" happened) bug in GHC 8.2.1 rc2
-------------------------------------+-------------------------------------
Reporter: deech | Owner: (none)
Type: bug | Status: merge
Priority: normal | Milestone: 8.2.1
Component: Compiler | Version: 8.2.1-rc2
Resolution: fixed | Keywords:
Operating System: Unknown/Multiple | Architecture:
| Unknown/Multiple
Type of failure: None/Unknown | Test Case:
| simplCore/should_compile/T13708
Blocked By: | Blocking:
Related Tickets: | Differential Rev(s):
Wiki Page: |
-------------------------------------+-------------------------------------
Changes (by bgamari):
* status: closed => merge
* milestone: => 8.2.1
@@ -2,1 +2,1 @@
- {{{
+ {{{#!hs
New description:
The following causes a panic in GHC 8.2.1 rc2:
{{{#!hs
module Main where
indexOr :: a -> Int -> [a] -> a
indexOr fallback idx xs =
if (idx < length xs)
then xs !! idx
else fallback
main :: IO ()
main = undefined
}}}
When compiling I get:
{{{
[1 of 1] Compiling Main ( src/Examples/table-sort.hs,
.stack-work/dist/x86_64-linux/Cabal-2.0.0.0/build/fltkhs-table-sort
/fltkhs-table-sort-tmp/Main.o )
ghc: panic! (the 'impossible' happened)
(GHC version 8.2.0.20170507 for x86_64-unknown-linux):
idInfo
a_a2ws
Call stack:
CallStack (from HasCallStack):
prettyCurrentCallStack, called at
compiler/utils/Outputable.hs:1134:58 in ghc:Outputable
callStackDoc, called at compiler/utils/Outputable.hs:1138:37
in ghc:Outputable
pprPanic, called at compiler/basicTypes/Var.hs:526:34 in
ghc:Var
Please report this as a GHC bug:
http://www.haskell.org/ghc/reportabug
}}}
--
Comment:
I suspect we should merge this.
--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13708#comment:12>
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