Is there any way to get nestable block comments in LaTeX? I am using the `comment` package to get block comments, but nesting one comment inside another with `\begin{comment}...\begin{comment}...\end{comment}...\end{comment}` doesn't seem to work. (I get an error "\begin{document} ended by \end{comment}".)

When writing and revising papers, it would be useful to me to be able to comment out arbitrary blocks of text, even if they already have commented-out blocks within them.

I'm aware that there are editor-based solutions. What I'm asking is if there is a way to do this within the source of my LaTeX document.