what would
try { a: someReallyLongComplexFunctionThatRequiresLotsOfParsing }produce? is that an object with an "a" key in a try expression, or an "a" label, inside a try statement block?
This is a very good point, actually. OK, there is a couple ways of solving such situation:
Operator try* or *try can be introduced (similar to generators):
const [error, data] = try* JSON.parse('xx');
Maybe using round bracket to disambiguate the expression form (like we do for assignment object destructuring)?
try can be used as function similar to dynamic import
const [error, data] = try(JSON.parse, 'xxx');
functional approach, not as obvious as previous variant.
A new keyword aim (or attempt) can be introduced:
const [error, data] = aim JSON.parse('xxx');
But it can break some existing code.
I think first example is the most straight forward, for await it can look like:
const [error, data] = try* await fetch(url);
Form can be discussed, but using try as expression can be very useful, and simplify code a lot in a similar to throw expressions way.