Cypher: collect and sum of same expression fails

[freeeve]

start n=node(*) 
match n-[:parent_of*]->child 
where not(child-[:parent_of]->()) 
return n, sum(child.val), collect(child.val);

Error: Unknown identifier `child`.

http://console.neo4j.org/?id=l6lz2e

[freeeve]

I realize this can be worked around relatively easily, but it feels like it should probably work, since other aggregations can work together.

[freeeve]

Thanks guys. :)