Start implementing typed throw specifiers with the syntax throws(X). There are a large number of tasks involved in such a feature; this pull request covers the parsing and type checking aspects. ...

Yes, I think it is. I've become interested in typed throws because it's a good direction for error handling in Embedded Swift, and have started on an implementation. I'd be happy to work with other folks on the proposal and design. @minuscorp had a good start on a proposal that captures a lot of the motivation, and @John_McCall laid out much of...