Immutability by default [was: Re: Tidy auto [Was: Re: @disable]]

[Walter Bright]

Leandro Lucarella wrote:
> Do you remember when people asked for default immutability? I do :)

Yes, but it would break every other line of code already written in D.


> I like the idea of making x := y an alias for immutable x = y (or even
> enum x = y). That would make this style much more attractive without
> breaking backward compatibility as immutable-by-default would do.


Actually,

     const x = y;

is better than immutable, because if y is a T*, it cannot be implicitly 
converted to immutable, while it can be implicitly converted to const.