Run test on file, not on stdin.

Makefile

@@ -22,11 +22,11 @@ all : $(MAIN)
 	leg -o $@ $<
 
 test : $(MAIN)
-	./$(MAIN) < test.txt | tee test.out
+	./$(MAIN) test.txt 2>&1 | tee test.out
 	@diff test.ref test.out && echo '\012--- PASSED ---'
 
 testref : $(MAIN)
-	./$(MAIN) < test.txt | tee test.ref
+	./$(MAIN) test.txt 2>&1 | tee test.ref
 
 bench : $(MAIN)-opt
 	time ./$(MAIN)-opt -O bench.txt