tree 4bb3de1de3f363dbcddb340ceeecaf6bea2f67dd
parent b5387bd4b0a6ed4475e0d794d2e43c6a0a19ec6e
author Roy Williams <royw@fb.com> 1382723314 -0700
committer Michael Bolin <mbolin@fb.com> 1383166193 -0700

Allow the visitor to visit a subset of its children instead of all of them.

Test Plan: Unit tests.