py: Fix regress with GeneratorExit object becoming truly const.

1 files changed, 2 insertions, 1 deletions

diff --git a/py/vm.c b/py/vm.c
index 1f349dea61..0ff27254a0 100644
--- a/py/vm.c
+++ b/py/vm.c
@@ -735,7 +735,8 @@ yield:
             // set file and line number that the exception occurred at
             // TODO: don't set traceback for exceptions re-raised by END_FINALLY.
             // But consider how to handle nested exceptions.
-            if (mp_obj_is_exception_instance(nlr.ret_val)) {
+            // TODO need a better way of not adding traceback to constant objects (right now, just GeneratorExit_obj)
+            if (mp_obj_is_exception_instance(nlr.ret_val) && nlr.ret_val != &mp_const_GeneratorExit_obj) {
                 machine_uint_t code_info_size = code_info[0] | (code_info[1] << 8) | (code_info[2] << 16) | (code_info[3] << 24);
                 qstr source_file = code_info[4] | (code_info[5] << 8) | (code_info[6] << 16) | (code_info[7] << 24);
                 qstr block_name = code_info[8] | (code_info[9] << 8) | (code_info[10] << 16) | (code_info[11] << 24);