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type Toc struct {
	Items []*TocItem
}

type TocItem struct {
	// Title of this item in the table of contents.
	//
	// This may be blank for items that don't refer to a heading, and only
	// have sub-items.
	Title []byte

	// ID is the identifier for the heading that this item refers to. This
	// is the fragment portion of the link without the "#".
	//
	// This may be blank if the item doesn't have an id assigned to it, or
	// if it doesn't have a title.
	//
	// Enable AutoHeadingID in your parser if you expected these to be set
	// but they weren't.
	ID []byte

	// Items references children of this item.
	//
	// For a heading at level 3, Items, contains the headings at level 4
	// under that section.
	Items []*TocItem
}

type TocOptions struct {
	MinDepth, MaxDepth int
}