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  • Glasgow Haskell CompilerGlasgow Haskell Compiler
  • GHCGHC
  • Issues
  • #10945
Closed
Open
Issue created Oct 08, 2015 by Jan Stolarek@jstolarek

Typed Template Haskell splices broken in HEAD (7.11)

In the latest HEAD (e2b579e8) when I say:

$$(return [
   SigD (mkName "m")
        (ForallT [PlainTV (mkName "a")]
                 []
                 (AppT (AppT ArrowT (VarT (mkName "a"))) (VarT (mkName "a"))))
 , FunD (mkName "m")
        [Clause [VarP (mkName "x")] (NormalB (VarE (mkName "x"))) []]
 ])

I get:

ghc-stage2: panic! (the 'impossible' happened)
  (GHC version 7.11.20151007 for x86_64-unknown-linux):
        runRnSplice
  $$(return
       [SigD
          (mkName "m")
          (ForallT
             [PlainTV (mkName "a")]
             []
             (AppT (AppT ArrowT (VarT (mkName "a"))) (VarT (mkName "a")))),
        FunD
          (mkName "m")
          [Clause [VarP (mkName "x")] (NormalB (VarE (mkName "x"))) []]])

This code compiles correctly in GHC 7.10.1.

Trac metadata
Trac field Value
Version 7.11
Type Bug
TypeOfFailure OtherFailure
Priority high
Resolution Unresolved
Component Template Haskell
Test case
Differential revisions
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Blocking
CC goldfire
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