[Issue 13704] Confusing error message when passing the same on the command line twice

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=13704

--- Comment #2 from github-bugzilla at puremagic.com ---
Commit pushed to master at https://github.com/D-Programming-Language/dmd

https://github.com/D-Programming-Language/dmd/commit/011ee1fc25c6b97a7f1f3baa334c096169f97587
Merge pull request #4123 from rainers/issue13704

Fix issue 13704 - Confusing error message when passing the same on the command
line twice

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