return in void functions

[Christopher Wright]

bearophile wrote:
> D has safeties to avoid this kind of code, because it's essentially considered a bug:
> 
> But this compiles with no errors:
> 
> void foo() {
>     return 1;
> }
> void main() {
>     foo();
> }

This is an error you'll catch very quickly. If you never use the 
function, you won't have an error, which is a problem if you're 
releasing a library that you did not test.