panic on conflicting patterns in TH splice

The definition

g c c = undefined

gives a nice error message:

Conflicting definitions for c' In the definition of g'

.

However, when trying to splice in the analogous function

foo = sequence
  [
    funD (mkName "f")
      [
        clause
          [varP $ mkName "c",varP $ mkName "c"]
          (normalB $ [| undefined |])
          []
      ]
  ]

, the compiler panics:

ghc-6.4.2: panic! (the `impossible' happened, GHC version 6.4.2):

SrcLoc.srcSpanStartLine

1. It would be nice if ghc gave an error message just like the non-TH case.

Trac metadata

Trac field	Value
Version	6.4.2
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Template Haskell
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system	Unknown
Architecture	Unknown