Invalid foreach aggregate

[Chris via Digitalmars-d-learn]

Updating my code from 2.067.1 to 2.069.1 (I skipped 2.068, 
because I was too busy).

I get this error:

invalid foreach aggregate, define opApply(), range primitives, or 
use .tupleof

for code like

foreach (ref it; myArray.doSomething) {}

Probably not the best idea anyway. What's the best fix for this? 
Thanks.