diff options
Diffstat (limited to 'compiler')
| -rw-r--r-- | compiler/deSugar/DsMeta.hs | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/compiler/deSugar/DsMeta.hs b/compiler/deSugar/DsMeta.hs index 3317ffaa72..985916719f 100644 --- a/compiler/deSugar/DsMeta.hs +++ b/compiler/deSugar/DsMeta.hs @@ -424,7 +424,7 @@ repTy (HsForAllTy _ tvs ctxt ty) = repTy (HsTyVar n) | isTvOcc (nameOccName n) = do - tv1 <- lookupBinder n + tv1 <- lookupTvOcc n repTvar tv1 | otherwise = do tc1 <- lookupOcc n @@ -917,6 +917,18 @@ lookupOcc n Just (Splice _) -> pprPanic "repE:lookupOcc" (ppr n) } +lookupTvOcc :: Name -> DsM (Core TH.Name) +-- Type variables can't be staged and are not lexically scoped in TH +lookupTvOcc n + = do { mb_val <- dsLookupMetaEnv n ; + case mb_val of + Just (Bound x) -> return (coreVar x) + other -> failWithDs msg + } + where + msg = vcat [ ptext SLIT("Illegal lexically-scoped type variable") <+> quotes (ppr n) + , ptext SLIT("Lexically scoped type variables are not supported by Template Haskell") ] + globalVar :: Name -> DsM (Core TH.Name) -- Not bound by the meta-env -- Could be top-level; or could be local |