From ed1e60f6336d683a41dbe88bb406d6bff693e090 Mon Sep 17 00:00:00 2001
From: krasimir <krasimir@chalmers.se>
Date: Mon, 30 May 2016 17:15:09 +0000
Subject: [PATCH] fix in the Haskell binding: functionType should throw error
 if the function is not defined

---
 src/runtime/haskell-bind/PGF2.hsc | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/runtime/haskell-bind/PGF2.hsc b/src/runtime/haskell-bind/PGF2.hsc
index 6435813ee..e7b13fbc1 100644
--- a/src/runtime/haskell-bind/PGF2.hsc
+++ b/src/runtime/haskell-bind/PGF2.hsc
@@ -149,7 +149,9 @@ functionType p fn =
   withGuPool $ \tmpPl -> do
     c_fn <- newUtf8CString fn tmpPl
     c_type <- pgf_function_type (pgf p) c_fn
-    peekType c_type
+    if c_type == nullPtr
+      then throwIO (PGFError ("Function '"++fn++"' is not defined"))
+      else peekType c_type
   where
     peekType c_type = do
       cid <- (#peek PgfType, cid) c_type >>= peekUtf8CString