src/vs/workbench/contrib/debug/browser/debugSession.ts/DebugSession/cancel
class DebugSession:	async cancel(progressId: string): Promise<DebugProtocol.CancelResponse | undefined> {
		if (!this.raw) {
			return Promise.reject(new Error(localize('noDebugAdapter', "No debugger available, can not send '{0}'", 'cancel')));
		}

		return this.raw.cancel({ progressId });
	}