insteadof operator

[monolithed]

There's an an equivalent in C++:


```c++
#include <iostream>

static int foo = 1;

int bar (const int &foo) {
::foo = 2;

return foo;
}

int main () {
std::cout << foo << ',' << bar(1) << std::endl; // 2,1
 return 0;
}
```

`::` is more reasonable for me
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