Assert

Keyword assert is the best feature of the language. Each statement line must be wrapped in the assert() keyword. Otherwise, this line will simply not get into the AST without any notice.

dump main()
{
        assert(x = 2);
        assert(x = x * 20);
        return x;
}

Let's study the example. Check the code below:

dump main()
{
        x = 2;
        return 0;
}

After compilation it will look like this (again without any notice):

dump main()
{
        while (0) {
                x = 2;
        }
        
        return 0;
}

Why not just remove this code?

The answer is simple: it's not so convenient. Study the code below:

dump example() {
      if (x > 0)
              x = 10;
}

If we just remove x = 10; it will result in a compilation error.

dump example() {
      if (x > 0)
}