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setup: update error message to be more meaningful
The error message shown when a flag is found when expecting a filename wasn't clear as it didn't communicate what was wrong using the 'suitable' words in *all* cases. $ git ls-files README.md test-file Correct case, $ git rev-parse README.md --flags README.md --flags fatal: bad flag '--flags' used after filename Incorrect case, $ git grep "some random regex" -n fatal: bad flag '-n' used after filename The above case is incorrect as "some random regex" isn't a filename in this case. Change the error message to be general and communicative. This results in the following output, $ git rev-parse README.md --flags README.md --flags fatal: option '--flags' must come before non-option arguments $ git grep "some random regex" -n fatal: option '-n' must come before non-option arguments Signed-off-by: Kaartic Sivaraam <kaarticsivaraam91196@gmail.com>
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