[Issue 11881] -betterC switch suffers from bit rot

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=11881

--- Comment #18 from Martin Nowak <code at dawg.eu> ---
Use `extern(C) int main` to avoid the _d_run_main dependency of the generated C
main wrapper.

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