Implicit conversion from 'Ok' to 'Result' type when returning functions

[David Zhang via Digitalmars-d-learn]

On Sunday, 21 May 2017 at 09:15:56 UTC, Nicholas Wilson wrote:
> have free functions
>
>  Result!(T, ErrorEnum) ok(T)(T t) { return Result(t); }
>  Result!(T, ErrorEnum) error(T)(ErrorEnum e) { return 
> Result(e); }
>
> then go
>
> if (!foo)
>     return ok(42);
> else
>     return error(Error.fooHappened);

Ah, I think you misread. ErrorEnum is a template type, like `T`. 
There's no ErrorEnum enum specified.