[Issue 16048] std.getopt: duplicated options are not detected

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=16048

--- Comment #3 from github-bugzilla at puremagic.com ---
Commit pushed to master at https://github.com/dlang/phobos

https://github.com/dlang/phobos/commit/43880932f56f412eb5c3e4fcc395c507c1aa93ad
Throw error on duplicate long/short options

Fixes Issue 16048

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