public Future <B> map <B>(Fn <A, B> mapper)
{
return(implementation.fold(
v => Future <B> .successful(mapper(v)),
_ => Future <B> .unfulfilled,
f => Future <B> .async(p => f.onComplete(v => p.complete(mapper(v))))
));
}
public override string ToString() =>
$"{nameof(Error)}[" +
$"{type} " +
$"in '{objFullPath}' " +
$@"@ '{location.fold(
asset => asset.path,
scenePath => scenePath.path,
unknownLocation => "Unknown location"
)}'. " +
$"{message}" +
$"]";