How to test tuple in chain

[closescreen via Digitalmars-d-learn]

Hello!

If I want testing tuple member in functional manner, what I shoul 
do?

Example:


"ls -l".executeShell returns me tuple (int "status", string 
"output")

I want write somthing like:

"ls -l".executeShell.smthTestingOperation!"Error: bad status."( 
res => res.status==0 ).output.writeln;

(where "smthTestingOperation" - is function which I want to find 
in std )