Show expected value

tests/datawizard/manual_reduction.c

@@ -1,6 +1,6 @@
 /* StarPU --- Runtime system for heterogeneous multicore architectures.
  *
- * Copyright (C) 2010, 2012-2014  Université de Bordeaux
+ * Copyright (C) 2010, 2012-2015  Université de Bordeaux
  * Copyright (C) 2012, 2013  CNRS
  *
  * StarPU is free software; you can redistribute it and/or modify
@@ -251,7 +251,10 @@ int main(int argc, char **argv)
 	if (variable == INIT_VALUE + NTASKS)
 		ret = EXIT_SUCCESS;
 	else
+	{
+		FPRINTF(stderr, "%u != %u + %u\n", variable, INIT_VALUE, NTASKS);
 		ret = EXIT_FAILURE;
+	}
 	STARPU_RETURN(ret);
 
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