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This changes to an `Error` return to let the driver do the "error: " prefix, except for one case with `help` that needs more work to change (I'm not planning on picking up that TODO). It also changes capitalization, backtick use, and a few minor punctuation things to try to better match the diagnostic style. This also adds `Error` matchers so that the changes to command line testing are clearer.
Testing
Testing-specific libraries.