ReturnIf feature to reduce nesting

[ahmedameen2]

If you added language features like ReturnIfTrue, ReturnIfFalse, ReturnIfNull the code will be more readable and nesting will be reduced.

[HaloFour]

See: #2195

The language already allows you to put such a statement onto a single line with no nesting:

if (condition) return;

[ahmedameen2]

I was hoping to reduce the below in one line:
var locationResult = await ValidateLocation(locationId);
if (locationResult.IsFailed)
return locationResult;

[HaloFour]

You could do this:

if ((await ValidateLocation(locationId)) is var locationResult && locationResult.IsFailed) return locationResult;

Although I question the readability of trying to jam that into a single line even with a bespoke language feature to do it.

It also seems like you're trying to work with a variant of a Result<T> ADT, and that's something that might be considered as a part of discriminated unions.

Not to mention wrapping a Result<T> in a Task<T> seems redundant.