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-rw-r--r--src/runtime/haskell/PGF/Check.hs2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/runtime/haskell/PGF/Check.hs b/src/runtime/haskell/PGF/Check.hs
index 6ac8c9b20..8f3b82eb7 100644
--- a/src/runtime/haskell/PGF/Check.hs
+++ b/src/runtime/haskell/PGF/Check.hs
@@ -38,7 +38,7 @@ checkConcrete pgf (lang,cnc) =
checkl = checkLin pgf lang
-}
-type PGFSig = (Map.Map CId (Type,Int,[Equation]),Map.Map CId Term,Map.Map CId Term)
+type PGFSig = (Map.Map CId (Type,Int,Maybe [Equation]),Map.Map CId Term,Map.Map CId Term)
checkLin :: PGFSig -> CId -> (CId,Term) -> Err ((CId,Term),Bool)
checkLin pgf lang (f,t) =