$ g++ test.cpp -o test
test.cpp: In function ‘int main()’:
test.cpp:6:7: error: ‘basicLambda’ does not name a type
  auto basicLambda = [] { cout << "Hello, world!" << endl; };
test.cpp:7:14: error: ‘basicLambda’ was not declared in this scope
  basicLambda();
经过查询，发现 gcc 是 4.8.4 版本，应该是默认不开启，但是可以通过添加编译参数 -std=c++11 解决问题，
$ g++ test.cpp --std=c++11 -o test
$ ./test
Hello, world!