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Restructure Argument Clinic CLI #107467

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@erlend-aasland

Suggesting to ...:

  • make the clinic tool a well-behaved command-line citizen; write to stderr, not stdout, on error (partly depends on Rework Argument Clinic error handling #107468)
  • put the whole CLI in main, making it easier to mock the tool in the test suite (currently we use subprocesses, which is slow, and requires several lines of boiler-plate test setup code)
  • Introduce CLIError and use it for usage errors Used ArgumentParser.error instead.

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