Fix bounds checking on slices for constant parameters

src/check_expr.cpp

@@ -2851,9 +2851,9 @@ bool check_index_value(CheckerContext *c, bool open_range, Ast *index_value, i64
 			if (value) *value = v;
 			bool out_of_bounds = false;
 			if (open_range) {
-				out_of_bounds = v >= max_count+1;
-			} else {
 				out_of_bounds = v >= max_count;
+			} else {
+				out_of_bounds = v >= max_count+1;
 			}
 			if (v < 0) {
 				out_of_bounds = true;