Non-compilable code output for division operation in reverse mode

[vaithak]

Minimal code:

#include "clad/Differentiator/Differentiator.h"

double f(double x) {
  return -0.5/x;
}

int main() {
  clad::gradient(f);
  return 0;
}

The output derivative code is:

void f_grad(double x, double *_d_x) {
    goto _label0;
  _label0:
    {
        double _r0 = 1 * --0.5 / (x * x);  // <-------- error - consecutive (--) operators do not compile.
        *_d_x += _r0;
    }
}