Github user okram commented on a diff in the pull request:
https://github.com/apache/tinkerpop/pull/548#discussion_r98930854
--- Diff:
gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/step/map/FlatMapStep.java
---
@@ -44,6 +45,7 @@ public FlatMapStep(final Traversal.Admin traversal) {
return this.head.split(this.iterator.next(), this);
} else {
this.head = this.starts.next();
+ closeIterator();
--- End diff --
This should go before `this.starts.next()` as if `this.starts.next()` is
empty, it will throw `FastNoSuchElementException` and the previous iterator
would not have been closed.
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