Alias syntax removal

[kenji hara]

2013/2/10 bearophile <bearophileHUGS at lycos.com>

> Now I have a good amount of code broken by:
>
> alias x = 5;
>

This syntax never been valid in past, because alias declaration cannot make
alias of an expression.


> alias this = foo;
>

 This syntax was introduced very recent, in 2.061.

======

>From 2.061, we have get new alias syntax by fixing issue 3011.
http://d.puremagic.com/issues/show_bug.cgi?id=3011

Now we can write alias declaration as follows:

alias Integer = int;
alias IntArray = int[];

These syntax are continuously valid in 2.062.

But, while a discussion for the compiler fix, a wrong syntax change, which
has similar look but definitely different meaning, had been introduced.
https://github.com/D-Programming-Language/dmd/pull/1187

struct S {
    int value;
    alias value this;   // old syntax
    alias this = value;  // new syntax, from 2.061
}

I opened the pull request #1413 in the beta term for 2.061, but it had
_accidentally_ released without deeply discussion.
https://github.com/D-Programming-Language/dmd/pull/1413

I think and believe that we MUST reset things.

Kenji Hara
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