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[Adam D. Ruppe via Digitalmars-d-learn]

On Thursday, 19 January 2017 at 02:51:03 UTC, rikki cattermole 
wrote:
> Now, lets say Y was a struct, then yeah it can work.

In theory, it can work with either (the compiler could just 
insert the function call to alloc+construct), but it won't in D 
since we don't have implicit construction.