I’m not clear on the benefits of this proposal over just using anonymous functions. Some of the examples just seem contrived.

And the React example makes no sense, you can use a ternary and it is even shorter.

``` return ( <nav> <Home /> {loggedIn ? <LogoutButton /> : <LoginButton /> } </nav> ) ```

Having written quite a lot of Reason react (similar in syntax to the proposed React example) - while in this particular case because the example is so simple the ternary looks nicer, its also nice to just have a longer expression block in the middle of your JSX when you're doing more complex things.

for me the point is to be able to return from inside multiple expressions from the correct scope i.e. the root function without throwing.

What if you want a `switch` instead?

The proposal for pattern matching syntax seems more akin to what they're looking for.

https://github.com/tc39/proposal-pattern-matching