[nem-en] Completion engine

[vc]

Simple completion like this:
        Method1() : void
        {
           def x = Dictionary();
           x["a"] = 1;
           x["a"].
work fine. But if I try to complete match more complex code:
        Method1() : void
        {
           def x = Dictionary();
           do
           {
             x["a"] = 1;
             x["a"].
the completion engine fail.

How to force work completion engine in similar situations?

Vlad