[Issue 11988] Add __switch symbol to allow retrieval of switch statement value

[d-bugmail at puremagic.com]

https://d.puremagic.com/issues/show_bug.cgi?id=11988



--- Comment #2 from Andrej Mitrovic <andrej.mitrovich at gmail.com> 2014-01-24 13:56:44 PST ---
(In reply to comment #1)
> Why don't we just allow `auto var = <expression>`, like in an if-statement?

Because they would have different semantics. The if statement's body is not
entered when the expression implicitly converts to false, e.g.:

-----
void main()
{
    if (auto x = 0) { assert(0); }  // body not entered
    if (auto x = 1) { }
}
-----

-----
With a switch you wouldn't want this to happen. For example:
void main()
{
    switch (auto x = 0)
    {
        case 0:  // this must continue to work.
    }
}
-----

So you'd end up with different semantics.

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