py: Reraising exception possible only in except block.

1 files changed, 3 insertions, 0 deletions

diff --git a/py/vm.c b/py/vm.c
index f340f52190..d28416db3d 100644
--- a/py/vm.c
+++ b/py/vm.c
@@ -697,6 +697,9 @@ unwind_return:
                         unum = *ip++;
                         assert(unum <= 1);
                         if (unum == 0) {
+                            if (!currently_in_except_block) {
+                                nlr_jump(mp_obj_new_exception_msg(&mp_type_RuntimeError, "No active exception to reraise"));
+                            }
                             // This assumes that nlr.ret_val holds last raised
                             // exception and is not overwritten since then.
                             obj1 = nlr.ret_val;