Clang code complete for not well-formed code?

Question

I'm working on adding code complete via Clang to text editor to make it IDE.

The source code:

struct s {
  int a;
  float b;
};

void main() {
 s var;
 var.

The problem is that code complete for the position after dot returns nothing and if i add } at the end and retry code complete for the position after dot it shows the correct list.

I understand that the main function definition should be closed, but users frequently type chars one-by-one and don't want to close function first and then return back to variable and then get code complete. How can that be walked-around to avoid go back/return?

My idea was to get diagnostics and add } if i get according diagnostics, but it's unwished walk-around. Can Clang be smart enough to make it itself?