[Issue 4868] optlink doesn't complain about wrong extern declaration

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=4868

--- Comment #2 from Vladimir Panteleev <dlang-bugzilla at thecybershadow.net> ---
(In reply to Vladimir Panteleev from comment #1)
> Err, what's wrong with the extern declaration?
> 
> The example compiles and links fine for me today.

(Forgot to add - also runs without an Access Violation)

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