Some piece of WAT, is that a bug or a feature ?

[Rikki Cattermole via Digitalmars-d]

On 17/05/2015 8:38 p.m., deadalnix wrote:
> So this code:
>
> void main() {
>      string outs;
>
>      void foo() {
>          outs ~= "prout !";
>      }
>
>      import std.stdio;
>      writeln(outs);
> }
>
> Obviously print an empty string.
>
> Bug or feature ?

Feature. foo is never called.