[GHC] #14344: `ghc: panic!` when loading module

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[GHC] #14344: `ghc: panic!` when loading module

GHC - devs mailing list
#14344: `ghc: panic!` when loading module
-------------------------------------+-------------------------------------
           Reporter:  javi           |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:  8.2.1
           Keywords:                 |  Operating System:  MacOS X
       Architecture:                 |   Type of failure:  Compile-time
  Unknown/Multiple                   |  crash or panic
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
-------------------------------------+-------------------------------------
 I'm learning Haskell from an online book (haskellbook.com) and when I
 loaded an answers module, this happened:

 {{{#!hs
 Prelude> :l ex.hs
 [1 of 1] Compiling Ex               ( ex.hs, interpreted )
 ghc: panic! (the 'impossible' happened)
   (GHC version 8.2.1 for x86_64-apple-darwin):
         repSplitAppTys
   a_a1qJ[sk:1]
   Bool
   []
   Call stack:
       CallStack (from HasCallStack):
         prettyCurrentCallStack, called at
 compiler/utils/Outputable.hs:1133:58 in ghc:Outputable
         callStackDoc, called at compiler/utils/Outputable.hs:1137:37 in
 ghc:Outputable
         pprPanic, called at compiler/types/Type.hs:808:9 in ghc:Type

 Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug

 >

 }}}

 notice that the Prelude module got unloaded. The source code for my
 `ex.hs` module:

 {{{#!hs
 module Ex where

 import Data.Char

 myAny :: (a -> Bool) [a] -> Bool
 myAny pred [] = False
 myAny pred (x:xs) = pred x || myAny pred xs

 }}}

 You'll notice that I missed a `->` in `myAny`'s type signature.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14344>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler

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Re: [GHC] #14344: `ghc: panic!` when loading module

GHC - devs mailing list
#14344: `ghc: panic!` when loading module
-------------------------------------+-------------------------------------
        Reporter:  javi              |                Owner:  (none)
            Type:  bug               |               Status:  closed
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.2.1
      Resolution:  duplicate         |             Keywords:
Operating System:  MacOS X           |         Architecture:
 Type of failure:  Compile-time      |  Unknown/Multiple
  crash or panic                     |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #13819            |  Differential Rev(s):
       Wiki Page:                    |
-------------------------------------+-------------------------------------
Changes (by RyanGlScott):

 * status:  new => closed
 * resolution:   => duplicate
 * related:   => #13819


Comment:

 Thanks for the bug report. This is a duplicate of #13819, and has been
 fixed in the upcoming GHC 8.2.2 release:

 {{{
 $ /opt/ghc/8.2.2/bin/ghci Bug.hs
 GHCi, version 8.2.1.20170928: http://www.haskell.org/ghc/  :? for help
 Loaded GHCi configuration from /home/rgscott/.ghci
 [1 of 1] Compiling Ex               ( Bug.hs, interpreted )

 Bug.hs:5:10: error:
     • Expecting one fewer arguments to ‘a -> Bool’
       Expected kind ‘* -> *’, but ‘a -> Bool’ has kind ‘*’
     • In the type signature: myAny :: (a -> Bool) [a] -> Bool
   |
 5 | myAny :: (a -> Bool) [a] -> Bool
   |          ^^^^^^^^^^^^^^^
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14344#comment:1>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler

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Re: [GHC] #14344: `ghc: panic!` when loading module

GHC - devs mailing list
In reply to this post by GHC - devs mailing list
#14344: `ghc: panic!` when loading module
-------------------------------------+-------------------------------------
        Reporter:  javi              |                Owner:  (none)
            Type:  bug               |               Status:  closed
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.2.1
      Resolution:  duplicate         |             Keywords:
Operating System:  MacOS X           |         Architecture:
 Type of failure:  Compile-time      |  Unknown/Multiple
  crash or panic                     |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #13819            |  Differential Rev(s):
       Wiki Page:                    |
-------------------------------------+-------------------------------------

Comment (by javi):

 Cool, thanks! sorry for the dup...

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14344#comment:2>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler

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