Commit d279bcff authored by Damien George's avatar Damien George
Browse files

py/objstr: Fix eager optimisation of str/bytes addition.

The RHS can only be returned if it is the same type as the LHS.
parent 7b7ff60f
......@@ -354,7 +354,7 @@ mp_obj_t mp_obj_str_binary_op(mp_uint_t op, mp_obj_t lhs_in, mp_obj_t rhs_in) {
switch (op) {
case MP_BINARY_OP_ADD:
case MP_BINARY_OP_INPLACE_ADD: {
if (lhs_len == 0) {
if (lhs_len == 0 && mp_obj_get_type(rhs_in) == lhs_type) {
return rhs_in;
}
if (rhs_len == 0) {
......
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