auto: useful, annoying or bad practice?

[bauss]

On Wednesday, 9 May 2018 at 12:44:34 UTC, Jonathan M Davis wrote:
> On Monday, April 30, 2018 21:11:07 Gerald via Digitalmars-d 
> wrote:
>> [...]
>
> I think that the overall consensus is that it's great but that 
> you do have to be careful about using it when it reduces 
> clarity without adding other benefits.
>
> [...]

Using "auto" you can also have multiple return types.

auto foo(T)(T value)
{
     static if (is(T == int)) return "int: " ~ to!string(value);
     else return value;
}

You cannot give that function a specific return type as it's 
either T or it's string. It's not a single type.