Microsoft/TypeScript — pull request #1273 by CyrusNajmabadi (2014-11-26 01:15:37+00:00)
Title: Add support for parsing async/await in fidelity.

This demonstrates a possible approach to supporting async/await in the parser (including incremental support). Note: this is not actually part of the actual compiler. This is just a proof of concept for things at the syntactic level.