Microsoft/TypeScript — pull request #1498 by CyrusNajmabadi (2014-12-16 05:45:21+00:00)
Title: Do not pass context flags downward while parsing binding elements.

This prevents an unnecessary allocation, simplifies parsing code, and prevents
an issue where parsing depends on context flags not stored in the final tree.
This is an issue for incremental parsing that can lead to nodes being reused
inappropriately.