[Issue 9981] Implement lazy ref arguments

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=9981

John Colvin <john.loughran.colvin at gmail.com> changed:

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--- Comment #2 from John Colvin <john.loughran.colvin at gmail.com> ---
Is there a reason for this being disallowed?

Seeing as lazy is just pass-by-delegate, why not allow
pass-by-delegate-with-ref-return?

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