Return data from different types of conditional operation

[John Colvin via Digitalmars-d-learn]

On Thursday, 23 April 2015 at 09:48:21 UTC, Dennis Ritchie wrote:
> Hi,
> Why the program can not return different types of data from the 
> conditional operator?
>
> -----
> import std.stdio;
>
> auto foo() {
>
> 	if (true) {
> 		return 0;
> 	} else
> 		return "true";
> }
>
> void main() {
>
> 	writeln(foo);
> }

import std.variant, std.stdio;

auto foo()
{
	if (true)
		return Variant(0);
	else
		return Variant("Hello");
}

void main()
{
	foo.writeln;
}