[Feature request] Allow watch expressons in comments to be evaluated

[moizifty]

Hey, not sure if this has already been discussed somewhere or planned.

But having watch expressions in comments being evaluated would be awesome.

For example, something like:

// an example, raddbg: (x + 5)
int x = 7;

Which would show x as 12 in a similar tooltip as to when you pin variables you are watching whilst debugging.