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repl: document top level await limitation with const/let
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Fixes: #17669
Signed-off-by: James M Snell <jasnell@gmail.com>

PR-URL: #38449
Reviewed-By: Jiawen Geng <technicalcute@gmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Darshan Sen <raisinten@gmail.com>
Reviewed-By: Yongsheng Zhang <zyszys98@gmail.com>
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jasnell authored and targos committed Apr 29, 2021
1 parent a0c566f commit 620ee42
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Expand Up @@ -233,6 +233,23 @@ undefined
undefined
```

One known limitation of using the `await` keyword in the REPL is that
it will invalidate the lexical scoping of the `const` and `let`
keywords.

For example:

```console
> const m = await Promise.resolve(123)
undefined
> m
123
> const m = await Promise.resolve(234)
undefined
> m
234
```

### Reverse-i-search
<!-- YAML
added:
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