#844: panic on conflicting patterns in TH splice
---------------------------------+------------------------------------------
Reporter: guest | Owner:
Type: bug | Status: new
Priority: normal | Milestone:
Component: Template Haskell | Version: 6.4.2
Severity: minor | Keywords:
Os: Unknown | Difficulty: Unknown
Architecture: Unknown |
---------------------------------+------------------------------------------
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
. It would be nice if ghc gave an error message just like the non-TH case.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/844>
GHC <http://www.haskell.org/ghc/>
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