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

 

 This syntax was introduced very recent, in 2.061.

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From 2.061, we have get new alias syntax by fixing issue 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.

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.

I think and believe that we MUST reset things.

Kenji Hara