pub fn test_subcommand(
matches: &ArgMatches,
command: Command,
) -> Option<Result<(), String>>
Expand description
Check the [ArgMatches
] for the subcommand added by add_subcommand
.
All printing is done to stderr
to avoid clogging up potential output.
ยงReturns
Ignore if this returns None
.
Exit application when this returns Some
, and signal the user with the error, if any.