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

		const response = await this.raw.stepInTargets({ frameId });
		return response?.body.targets;
	}