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#include <iostream>
using namespace std;
#include <cstdlib>
 
int main() {
    const int m = 42;
    [] {std::cout<<m<<std::endl;    }(); // OK
 
    const int n = std::rand();
    [] { std::cout<<n<<std::endl; }(); // error: 'n' is not captured
 
	return 0;
}

prog.cpp: In lambda function:
prog.cpp:10:21: error: ‘n’ is not captured
     [] { std::cout<<n<<std::endl; }(); // error: 'n' is not captured
                     ^
prog.cpp:10:6: note: the lambda has no capture-default
     [] { std::cout<<n<<std::endl; }(); // error: 'n' is not captured
      ^
prog.cpp:9:15: note: ‘const int n’ declared here
     const int n = std::rand();
               ^

Standard output is empty