[Issue 15843] D-type mangling used for extern(C) (extern) function declaration inside function body, on LDC, GDC, and DMD.

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=15843

--- Comment #3 from anonymous4 <dfj1esp02 at sneakemail.com> ---
Static nested functions with C calling convention are useful as system
callbacks. They just don't need to be visible to other linked modules.

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