Refactor command line errors to mirror diagnostic style #4568
+464
−366
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This changes to an
Errorreturn to let the driver do the "error: " prefix, except for one case withhelpthat 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
Errormatchers so that the changes to command line testing are clearer.