From 2ff2ea5f3b1904834b287e74415f329b31d9a3db Mon Sep 17 00:00:00 2001
From: Paul Sokolovsky <pfalcon@users.sourceforge.net>
Date: Tue, 1 Sep 2015 10:35:58 +0300
Subject: [PATCH] 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.
---
 py/vm.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

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;