Can someone explain why this is not an error?

[bearophile]

FeepingCreature:
> Type deduction is a special case. I think the above was written before we had it.

OK. Special cases in a language are often bad, and I don't think that syntax is significantly handy. So if you agree Bernard Helyer can put it in bugzilla, asking to remove this special case:

void main() {
    immutable a1 = 3, b1 = "hello";
    auto a2 = 3, b2 = "hello";
    static a3 = 3, b3 = "hello";
    const a4 = 3, b4 = "hello";
}

Bye,
bearophile