I'd like to ask if there's anyone on TC39 that would be willing to champion a
proposal to add the let-block (let-statement) syntax?
I currently write my block-scoped declarations as:
```js
{ let a = 2, b, c;
// ..
}
```
I do this because I want to be in the habit of always putting my `let`
declarations at the top of blocks to avoid TDZ hazards. However, Firefox has
long had the alternate let-block/statement syntax, which I prefer:
```js
let (a = 2, b, c) {
// ..
}
```
Would there be support to consider such a proposal?
Side note: I'd also be in favor of a `const (a = 2) { .. }` form, if the
symmetry was appealing.
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