src/vs/workbench/api/common/extHostTypes.ts/Location/isLocation
class Location:	static isLocation(thing: any): thing is vscode.Location {
		if (thing instanceof Location) {
			return true;
		}
		if (!thing) {
			return false;
		}
		return Range.isRange((<Location>thing).range)
			&& URI.isUri((<Location>thing).uri);
	}