combineOperators() misidentifies references in C code

[chrchr-github]

&= is tokenized as & =:

int g(int i, int j) {
    return h(i &= ~j, i &= j);
}

// don't combine &= if it is a anonymous reference parameter with default value:
// void f(x&=2)

Also happens in C++ code. This compiles: void f(const int& = 2); This does not: void f(const int &= 2);