diff --git a/src/main.c b/src/main.c
index fa17a04..9acbe9a 100644
--- a/src/main.c
+++ b/src/main.c
@@ -119,7 +119,7 @@ int main(int argc, char **argv)
 				return -1;
 			}
 
-		Object *o = buildValue(heap, &error, "${ return 3+1; }");
+		Object *o = buildValue(heap, &error, "[${ return 3*1; }, $i, {}, {${return 'name';}: $s, ${return 'name';}: [$s]}]", 4, "Francesco", "Giovanni");
 	
 		if(o == NULL)
 			{
diff --git a/src/objects/o_list.c b/src/objects/o_list.c
index 5296d98..c8f2384 100644
--- a/src/objects/o_list.c
+++ b/src/objects/o_list.c
@@ -194,6 +194,7 @@ static void print(Object *self, FILE *fp)
 {
 	ListObject *list = (ListObject*) self;
 
+	fprintf(fp, "[");
 	for(int i = 0; i < list->count; i += 1)
 		{
 			Object_Print(list->vals[i], fp);
@@ -201,4 +202,5 @@ static void print(Object *self, FILE *fp)
 			if(i+1 < list->count)
 				fprintf(fp, ", ");
 		}
+	fprintf(fp, "]");
 }
\ No newline at end of file
diff --git a/src/objects/o_map.c b/src/objects/o_map.c
index cf56580..06026b1 100644
--- a/src/objects/o_map.c
+++ b/src/objects/o_map.c
@@ -294,6 +294,7 @@ static void print(Object *self, FILE *fp)
 {
 	MapObject *map = (MapObject*) self;
 
+	fprintf(fp, "{");
 	for(int i = 0; i < map->count; i += 1)
 		{
 			Object_Print(map->keys[i], fp);
@@ -303,4 +304,5 @@ static void print(Object *self, FILE *fp)
 			if(i+1 < map->count)
 				fprintf(fp, ", ");
 		}
+	fprintf(fp, "}");
 }
\ No newline at end of file