diff --git a/fzn-parser/fznslurp.pl b/fzn-parser/fznslurp.pl
index 62d9d0a..77c519c 100644
--- a/fzn-parser/fznslurp.pl
+++ b/fzn-parser/fznslurp.pl
@@ -38,10 +38,18 @@ load_ast((IN > INT), IN, OUT) :-
     load_ast(OP, INT, OUT).
 
 load_ast_deb(end_of_file, AST, AST).
-load_ast_deb(IN > INT,    IN,  OUT) :- read(OP), !,
-				       writeq(IN), write('.'), nl,
-				       writeq(OP), nl,
-				       load_ast_deb(OP, INT, OUT).
+load_ast_deb((IN > INT :- MOD), IN, OUT) :-
+    ( call(MOD) -> format("EXT OK ~q\n", [MOD]) ;
+      format("EXT FAIL ~q\n", [MOD]), fail ),
+    read(OP), !,
+    writeq(IN), write('.'), nl,
+    writeq(OP), nl,
+    load_ast_deb(OP, INT, OUT).
+load_ast_deb(IN > INT,    IN,  OUT) :- 
+    read(OP), !,
+    writeq(IN), write('.'), nl,
+    writeq(OP), nl,
+    load_ast_deb(OP, INT, OUT).
 
 % -----------------------------------------------------------------------------
 
--
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