[Issue 9238] Support rvalue references

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=9238



--- Comment #4 from Kenji Hara <k.hara.pg at gmail.com> 2012-12-29 08:04:06 PST ---
I'd like to propose using `in ref` rather than `auto ref` for the purpose.

Reasons:

1. `in ref` implies `const scope ref`. 

If the reference binds temporary rvalue, its address must not escape. We don't
have correct `scope` semantics yet, but we can allow the semantic as a limited
case.

2. `in ref` is recently allowed from 2.060, by fixing issue 8105.

https://github.com/d-programming-language/dmd/commit/687044996a06535210801577e5d68b72edfa3985

We can guess that many programmers don't use `in ref`.

3. For normal function, we cannot implement the exact `auto ref` semantics as
same as for template function.

That means, `auto ref` must be used with template function.

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