int _u_n_d_e_r_s_c_o_r_e_s_;
int a_r_e_;
int _c_o_o_l;

int __two_underscores_at_the_front;
int two_underscores__in_the_middle;
int two_underscores_at_the_end__;
int __; // two underscores in isolation

int three___underscores;

int contains_mangle_marker_X_;

struct two_underscores__in_a_structname {
    int two_underscores__in_a_struct_field;
} two_underscores__in_struct_var;

two_underscores__in_an_interface_block {
    int two_underscores__in_a_interface_block_field;
} two_underscores__in_a_interface_block_var;

// Code is not meaningful, but uses mangled identifiers and prevents elimination via optimizer.

noinline two_underscores__in_a_structname two_underscores__in_a_funcname(
        two_underscores__in_a_structname two_underscores__in_a_parameter) {
    if (__two_underscores_at_the_front == two_underscores_at_the_end__) {
        if (two_underscores__in_the_middle == contains_mangle_marker_X_) {
            ++contains_mangle_marker_X_;
        }
    }
    two_underscores__in_a_parameter.two_underscores__in_a_struct_field = __;
    return two_underscores__in_a_structname(three___underscores);
}

void main() {
    _u_n_d_e_r_s_c_o_r_e_s_ = a_r_e_ = _c_o_o_l;
    two_underscores__in_a_funcname(two_underscores__in_struct_var);
}