CommentsAll indicates all kinds of comments.

CommentsDetached refers to comments that are not "attached" to any source element.

CommentsLeading refers to a comment block immediately preceding an element in the source file.

CommentsNonDoc refers to comments that are *not* doc comments.

CommentsTokens refers to any comments (leading, trailing, or detached) on low-level elements in the file.

CommentsTrailing refers to a comment block immediately following an element in the source file.

Printer knows how to format file descriptors as proto source code.

CommentType is a kind of comments in a proto source file.