clang-repl can not correctly execute top-level for-loop statements

[wlonestar]

Consider the following piece of code:

for (int i = 0; i < 3; i++) {
  for (int j = 0; j < 3; j++) {
    std::cout << i << ":" << j << "\n";
  }
}

When running this code in clang-repl I found it will set i, j as global variables, so the output will be:

0:0
0:1
0:2

I have to put the double loops into a function and execute the function, but this contradicts the original intention of the usage of interpreter.