What's the purpose of the -v1 switch?

[Jarrett Billingsley]

On Wed, Apr 1, 2009 at 12:01 PM, Trass3r <mrmocool at gmx.de> wrote:
> I mean it can only be used with dmd 1.x compilers anyway.
>
> else if (strcmp(p + 1, "v1") == 0)
> {
> #if DMDV1
>        global.params.Dversion = 1;
> #else
>        error("use DMD 1.0 series compilers for -v1 switch");
>        break;
> #endif
> }
>

It turns off the features which were added to D1 after 1.000.  Things
like the 'ref' and 'macro' keywords, string mixins, import
expressions, changes to .init etc.