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ladybird/Userland/Shell
Ali Mohammad Pur 045c85af4b Shell: Raise an error if an execute node ends up trying to run nothing
...while capturing its standard output.
As `$()` is an invalid construct, execute nodes are not supposed to
capture the output of no command being run; but it is possible to create
empty commands such as CastToCommand(Redirection(...)) or similar.
Make this a hard error instead of an unescapable select().
This was noticed in #10432, which should now error out like so:
```
Error: Cannot capture standard output when no command is being executed
  0| $(<$file)
~~~~~^^^^^^^^^
  1|
```
2021-10-11 10:56:01 +03:30
..
2021-04-29 20:25:56 +02:00
2021-04-29 20:25:56 +02:00