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...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| ```