Re: [GHC] #16112: T11334b fails in the devel2 way

30 Dec 2018

#16112: T11334b fails in the devel2 way
-------------------------------------+-------------------------------------
        Reporter:  bgamari           |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  high              |            Milestone:  8.8.1
       Component:  Compiler          |              Version:  8.6.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
-------------------------------------+-------------------------------------
Changes (by bgamari):

 * cc: goldfire (added)


Old description:
...
{{{patch

--- dependent/should_fail/T11334b.run/T11334b.stderr.normalised
2018-12-30 16:00:25.377677569 +0000
+++ dependent/should_fail/T11334b.run/T11334b.comp.stderr.normalised
2018-12-30 16:00:25.377677569 +0000
@@ -1,24 +1,13 @@
+ghc: panic! (the 'impossible' happened)
+  (GHC version 8.7.20181230 for x86_64-unknown-linux):
+       ASSERT failed!
+  f_aBF[tau:2]
+  2
+  1
+  Call stack:
+      CallStack (from HasCallStack):
+        callStackDoc, called at
compiler/utils/Outputable.hs:<line>:<column> in <package-id>:Outputable
+        pprPanic, called at compiler/utils/Outputable.hs:<line>:<column>
in <package-id>:Outputable
+        assertPprPanic, called at
compiler/typecheck/TcType.hs:<line>:<column> in <package-id>:TcType
-T11334b.hs:8:14:
-     Cannot default kind variable ‘f0’
-      of kind: k0 -> *
-      Perhaps enable PolyKinds or add a kind signature
-     In an expression type signature: Proxy 'Compose
-      In the expression: Proxy :: Proxy 'Compose
-      In an equation for ‘p’: p = Proxy :: Proxy 'Compose
-
-T11334b.hs:8:14:
-     Cannot default kind variable ‘g0’
-      of kind: k10 -> k0
-      Perhaps enable PolyKinds or add a kind signature
-     In an expression type signature: Proxy 'Compose
-      In the expression: Proxy :: Proxy 'Compose
-      In an equation for ‘p’: p = Proxy :: Proxy 'Compose
-
-T11334b.hs:8:14:
-     Cannot default kind variable ‘a0’
-      of kind: k10
-      Perhaps enable PolyKinds or add a kind signature
-     In an expression type signature: Proxy 'Compose
-      In the expression: Proxy :: Proxy 'Compose
-      In an equation for ‘p’: p = Proxy :: Proxy 'Compose
+Please report this as a GHC bug:  https://www.haskell.org/ghc/reportabug
}}}
New description:

 {{{#!patch
 --- dependent/should_fail/T11334b.run/T11334b.stderr.normalised 2018-12-30
 16:00:25.377677569 +0000
 +++ dependent/should_fail/T11334b.run/T11334b.comp.stderr.normalised
 2018-12-30 16:00:25.377677569 +0000
 @@ -1,24 +1,13 @@
 +ghc: panic! (the 'impossible' happened)
 +  (GHC version 8.7.20181230 for x86_64-unknown-linux):
 +       ASSERT failed!
 +  f_aBF[tau:2]
 +  2
 +  1
 +  Call stack:
 +      CallStack (from HasCallStack):
 +        callStackDoc, called at
 compiler/utils/Outputable.hs:<line>:<column> in <package-id>:Outputable
 +        pprPanic, called at compiler/utils/Outputable.hs:<line>:<column>
 in <package-id>:Outputable
 +        assertPprPanic, called at
 compiler/typecheck/TcType.hs:<line>:<column> in <package-id>:TcType

 -T11334b.hs:8:14:
 -     Cannot default kind variable ‘f0’
 -      of kind: k0 -> *
 -      Perhaps enable PolyKinds or add a kind signature
 -     In an expression type signature: Proxy 'Compose
 -      In the expression: Proxy :: Proxy 'Compose
 -      In an equation for ‘p’: p = Proxy :: Proxy 'Compose
 -
 -T11334b.hs:8:14:
 -     Cannot default kind variable ‘g0’
 -      of kind: k10 -> k0
 -      Perhaps enable PolyKinds or add a kind signature
 -     In an expression type signature: Proxy 'Compose
 -      In the expression: Proxy :: Proxy 'Compose
 -      In an equation for ‘p’: p = Proxy :: Proxy 'Compose
 -
 -T11334b.hs:8:14:
 -     Cannot default kind variable ‘a0’
 -      of kind: k10
 -      Perhaps enable PolyKinds or add a kind signature
 -     In an expression type signature: Proxy 'Compose
 -      In the expression: Proxy :: Proxy 'Compose
 -      In an equation for ‘p’: p = Proxy :: Proxy 'Compose
 +Please report this as a GHC bug:  https://www.haskell.org/ghc/reportabug
 }}}

--

-- 
Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/16112#comment:1
GHC http://www.haskell.org/ghc/
The Glasgow Haskell Compiler

    