[Issue 20358] External initialization of private struct fields should be disallowed

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20358

--- Comment #5 from Max Samukha <maxsamukha at gmail.com> ---
I disagree. Implicit constructors should not magically give public assess to
private members. That breaks encapsulation. I bet you wouldn't like it if the
compiler implicitly generated public setters for private fields. Mutating
private fields with an external initializer is analogous to that.

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