I very much like knowing where a local variable stops being relevant. Often I'll do things like
```ts
let foo;
{
const bar = f();
const baz = g();
foo = h(bar, baz);
}
```
to contain intermediate variables in a lexical scope (TypeScript is trashy that I have to define `foo` outside the braces—Julia etc. blocks can return).

I wish syntax or editors helped even more in showing when a variable stops mattering. It might be one of those small ergonomic things that add up to much more.

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