rhg: add Command trait for subcommands implemented by rhg Normalizes the interface of the cli's commands Differential Revision: https://phab.mercurial-scm.org/D8611 Differential Revision: https://phab.mercurial-scm.org/D8648

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/// The error type for the Command trait

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#[derive(Debug, PartialEq)]

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pub struct CommandError {}