Basic parser for AT
Summary: This is a simple parser for Box's augmented types, as the
basis of an AT-to-Hack conversion tool. It was optimized for being easy
to write, not really for having good error recovery/detection or for
being super flexible, since AT isn't really changing, and this will be a
run-once tool.
https://github.com/box/augmented_types/wiki/The-Type-System
Reviewed By: @ptarjan
Differential Revision:
D1652771
Signature: t1:
1652771:
1415154622:
03f5f990895cedb819126df07dc6c439d898f510