Introductory it as Subject
Other productive usesThis pattern is productive, and occurs with a wide range of verbs concerned with the consequences or implications of actions and events. For example, it occurs in clauses like It accentuates wrinkles to fill them with face-powder and It put a strain on his heart to reach up high.
In addition there are a few fairly fixed phrases with this pattern.
It broke my heart to see him go.
It crossed my mind to phone her.
It never entered her head to question him.
It makes a world of difference to be dying for your ideas.
It made sense to delay the meeting, as there were no concrete proposals on the table.
It serves no purpose to disclose what happens for those who haven't seen the film.