[Issue 21033] enhancement: allow assign to field when the shared owing object has been locked already without cast

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https://issues.dlang.org/show_bug.cgi?id=21033

--- Comment #4 from anonymous4 <dfj1es...@sneakemail.com> ---
(In reply to anonymous4 from comment #3)
> What you ask can't be for all reference types.
can't be done

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