vm: Handle "raise X from Y" statements the best way we can.

By issuing a warning that exception chaining is not supported, and ignoring
"from Y" argument.

1 files changed, 5 insertions, 1 deletions

diff --git a/py/vm.c b/py/vm.c
index 08749af21b..2611be683a 100644
--- a/py/vm.c
+++ b/py/vm.c
@@ -1048,7 +1048,11 @@ unwind_return:
                     MARK_EXC_IP_SELECTIVE();
                     mp_uint_t unum = *ip++;
                     mp_obj_t obj;
-                    assert(unum <= 1);
+                    if (unum == 2) {
+                        mp_warning("exception chaining not supported");
+                        // ignore (pop) "from" argument
+                        sp--;
+                    }
                     if (unum == 0) {
                         // search for the inner-most previous exception, to reraise it
                         obj = MP_OBJ_NULL;