Hack Specification 1.1

This is a major point release of the Hack specification. Included in this update are new Hack features since 1.0, Hack support based on PHP 7 features, bug fixes and cleanup from 1.0. New tests have been written and current tests have been updated as needed. Here is a partial list of additions to the specification:

• Type Constants
• Nullsafe Property Access
• noreturn
• classname
• Shapes structural subtyping
• Coalesce Operator

... and more.

Hack Specification 1.0

This is the initial version of the Hack specification.