Empty program causes unused expr warning in C++ code

[kevin1]

Very low priority.

Clang output:

<stdin>:8:1: warning: expression result unused [-Wunused-value]
LIT_UNIT;
^~~~~~~~
1 warning generated.

Generated code:

#include <iostream>
#include <string>
#include <vector>
#include "support.hpp"
int main()
{
return [&] () -> int64_t {
LIT_UNIT;
return 0;
}
();
}