panic nameModule tpl_B1{v}

using the attached code, we get

*Main> cfd True
"cfd"
*Main> ctf True

<interactive>:1:0:
    No instance for (CTF Bool how)
      arising from a use of `ctf' at <interactive>:1:0-7
    Possible fix: add an instance declaration for (CTF Bool how)
    In the expression: ctf True
    In the definition of `it': it = ctf True

but if we uncomment the CTF instance, we get panic, even for cfd..

*Main> cfd True
: panic! (the 'impossible' happened)
  (GHC version 6.9.20080217 for i386-unknown-mingw32):
        nameModule tpl_B1{v}

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

*Main> ctf True
: panic! (the 'impossible' happened)
  (GHC version 6.9.20080217 for i386-unknown-mingw32):
        nameModule tpl_B1{v}

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

Trac metadata

Trac field	Value
Version	6.9
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system	Unknown
Architecture	Unknown