src/vs/editor/common/model/bracketPairsTextModelPart/bracketPairsTree/ast.ts/TwoThreeListAstNode/children
class TwoThreeListAstNode:	public get children(): readonly AstNode[] {
		return this._item3 ? [this._item1, this._item2, this._item3] : [this._item1, this._item2];
	}