Destructors, const structs, and opEquals

[so]

> I'm a bit uncertain as to how this is all supposed to work.
> (1) Should temporaries be allowed to be passed as 'const ref'?

Rather, what keeps compiler from interpreting "A fun()" like "const ref A  
fun()" when it is necessary?
After all D's const system has no holes in this case unlike C++.

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