Forgotten already? http://prowiki.org/wiki4d/wiki.cgi?DocComments/Property#Semantic
This is the same problem as property lvalue-ness and it has the same solution. When property rewriting is done correctly, the opIndexAssign problem can then be solved almost for free. Just treat opIndex expressions as properties, and when they are the subject of a side-effect then make sure the write property (AKA opIndexAssign) gets called.
