src/vs/workbench/api/common/extHostTypes.ts/DocumentSymbol/constructor
class DocumentSymbol:	constructor(name: string, detail: string, kind: SymbolKind, range: Range, selectionRange: Range) {
		this.name = name;
		this.detail = detail;
		this.kind = kind;
		this.range = range;
		this.selectionRange = selectionRange;
		this.children = [];

		DocumentSymbol.validate(this);
	}