# Description
Fixes: #11394
When run `^sleep 3` we have an `exit_code ListStream`, and when we press
ctrl-c, this `ListStream` will return None. But it's not expected,
because `exit_code` sender in `run_external` always send an exit code
out.
This pr is trying to fix the issue by introducing a `first_guard` into
ListStream, it will always generate a value from underlying stream if
`first_guard` is true, so it's guarantee to have at least one value to
return.
And the pr also do a little refactor, which makes use of
`ListStream::from_stream` rather than construct it manually.
# User-Facing Changes
## Before
```
> nu -c "^sleep 3" # press ctrl-c
> echo $env.LAST_EXIT_CODE
0
```
## After
```
> nu -c "^sleep 3" # press ctrl-c
> echo $env.LAST_EXIT_CODE
255
```
# Tests + Formatting
None, sorry that I don't think it's easy to test the ctrlc behavior.
# After Submitting
None
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