Fix confusing error message w/ single-dash option#728
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When a required option has a short name, longer single-dash arguments can end up incorrectly colliding and causing confusing error messages. This changes the error handling when a short-name option is missing a value to show both the missing-value error _and_ a message about the unrecognized longer/composite option. Fixes #709.
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When a required option has a short name, longer single-dash arguments can end up incorrectly colliding and causing confusing error messages. This changes the error handling when a short-name option is missing a value to show both the missing-value error and a message about the unrecognized longer/composite option.
Fixes #709.
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