src/vs/editor/common/model/bracketPairsTextModelPart/bracketPairsTree/ast.ts/TwoThreeListAstNode/constructor
class TwoThreeListAstNode:	public constructor(
		length: Length,
		listHeight: number,
		private _item1: AstNode,
		private _item2: AstNode,
		private _item3: AstNode | null,
		missingOpeningBracketIds: SmallImmutableSet<OpeningBracketId>
	) {
		super(length, listHeight, missingOpeningBracketIds);
	}