std.sumtype?

[surlymoor]

On Sunday, 29 August 2021 at 19:51:30 UTC, Paul Backus wrote:
> ```d
> return exp[0].match!(
>     (IdentifierExpression exp) => exp.ident,
>     function string (_) { throw new Exception("..."); }
> );
> ```
>
> Note the explicit return type of `string` on the second lambda. 
> The compiler will allow this, even though the lambda never 
> returns a `string`, because it never returns normally at all.

Can't wait until DIP1034 is fully implemented so one needn't do 
this.