I've done nearly 100 interviews at Google, at least half of them with me copying code from a whiteboard, and I have never tried to compile a line of code that a candidate wrote.

I also go out of my way, to make it clear that I don't care about every hanging parenthesis, indentation, or typo.

I care about whether or not the candidate asks for clarification, or bulls ahead with assumptions, whether the overall algorithm works, whether the candidate can identify limitations of, and bugs in their solution (Everyone has bugs. Everyone. There's nothing wrong with that.) and what their testing strategy is.