Slightly more detailed exception message.

theano/tensor/basic.py

@@ -3167,8 +3167,8 @@ class AdvancedIncSubtensor(Op):
                             broadcastable = x.type.broadcastable)])
             raise NotImplementedError('Advanced indexing increment of x (of dimension %i) by y (of dimension %i) with these argument dimensions (%s) not supported yet'\
                     % (x.ndim, y.ndim, ','.join(str(input.ndim) for input in inputs)))
-        raise NotImplementedError('Advanced indexing increment of x by y with arguments (%s) not supported yet'\
-                % ','.join(str(input) for input in inputs))
+        raise NotImplementedError('Advanced indexing increment of x (of dim %i) by y (of dim %i) with arguments (%s) not supported yet'\
+                % (x.ndim, y.ndim, ','.join(str(input) for input in inputs)))
 
     def perform(self, node, inputs, (out,)):
         # TODO: same thing as in AdvancedSubtensor's perform TODO