[GHC] #14828: panic! when using :print on some functions with class constraints?
GHC
ghc-devs at haskell.org
Sun Dec 30 23:39:37 UTC 2018
#14828: panic! when using :print on some functions with class constraints?
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Reporter: jol | Owner: (none)
Type: bug | Status: new
Priority: normal | Milestone:
Component: GHCi | Version: 8.2.2
Resolution: | Keywords: debugger
Operating System: Linux | Architecture: x86_64
Type of failure: Compile-time | (amd64)
crash or panic | Test Case:
Blocked By: | Blocking:
Related Tickets: | Differential Rev(s):
Wiki Page: |
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Comment (by olligobber):
Note this is still an issue in 8.6.2
{{{
GHCi, version 8.6.2: http://www.haskell.org/ghc/ :? for help
Prelude> :print fmap
ghc: panic! (the 'impossible' happened)
(GHC version 8.6.2 for x86_64-unknown-linux):
isUnliftedType
t1_a1x6[rt] :: TYPE t_a1x5[rt]
Call stack:
CallStack (from HasCallStack):
callStackDoc, called at compiler/utils/Outputable.hs:1160:37 in
ghc:Outputable
pprPanic, called at compiler/types/Type.hs:2021:10 in ghc:Type
Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug
}}}
--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14828#comment:2>
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