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gh-104683: Rework Argument Clinic error handling (#107551)
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Introduce ClinicError, and use it in fail(). The CLI runs main(),
catches ClinicError, formats the error message, prints to stderr
and exits with an error.

As a side effect, this refactor greatly improves the accuracy of
reported line numbers in case of error.

Also, adapt the test suite to work with ClinicError.

Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>
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@erlend-aasland @AlexWaygood
erlend-aasland and AlexWaygood authored Aug 3, 2023
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