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-rw-r--r--src/runtime/haskell-bind/PGF2/FFI.hsc3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/runtime/haskell-bind/PGF2/FFI.hsc b/src/runtime/haskell-bind/PGF2/FFI.hsc
index 082b58d36..f0a811c6d 100644
--- a/src/runtime/haskell-bind/PGF2/FFI.hsc
+++ b/src/runtime/haskell-bind/PGF2/FFI.hsc
@@ -551,3 +551,6 @@ foreign import ccall "pgf/data.h pgf_lzr_index"
foreign import ccall "pgf/data.h pgf_production_is_lexical"
pgf_production_is_lexical :: Ptr PgfProductionApply -> Ptr GuBuf -> Ptr GuPool -> IO (#type bool)
+
+foreign import ccall "pgf/expr.h pgf_clone_expr"
+ pgf_clone_expr :: PgfExpr -> Ptr GuPool -> IO PgfExpr