Update mojo sdk to rev e083961bf11fd0c94d40be8853761da529b6d444

mojo/public/python/mojo/bindings/promise.py

Index: mojo/public/python/mojo/bindings/promise.py
diff --git a/mojo/public/python/mojo/bindings/promise.py b/mojo/public/python/mojo/bindings/promise.py
index c5d7d7cb641945e14af53d1b1d5e681db57d21b2..ebf6f85e0dcc034f3346a8a2197170012831bb2b 100644
--- a/mojo/public/python/mojo/bindings/promise.py
+++ b/mojo/public/python/mojo/bindings/promise.py
@@ -8,6 +8,8 @@ Promise used by the python bindings.
 The API is following the ECMAScript 6 API for promises.
 """
 
+import sys
+
 
 class Promise(object):
   """The promise object."""
@@ -33,8 +35,12 @@ class Promise(object):
     self._onRejected = []
     self._state = Promise.STATE_PENDING
     self._result = None
-    if generator_function:
+    try:
       generator_function(self._Resolve, self._Reject)
+    except Exception as e:
+      # Adding traceback similarly to python 3.0 (pep-3134)
+      e.__traceback__ = sys.exc_info()[2]
+      self._Reject(e)
 
   @staticmethod
   def Resolve(value):
@@ -184,5 +190,7 @@ def _Delegate(resolve, reject, action):
       else:
         resolve(x)
     except Exception as e:
+      # Adding traceback similarly to python 3.0 (pep-3134)
+      e.__traceback__ = sys.exc_info()[2]
       reject(e)
   return _Run