typo in transform template

[travisdowns]

I believe there is a typo in the template below:

template transform(string f0, string f1, string f2, string c)
{
    import std.array : replace;
    enum raw = `_f0 *= _c;
                _f0 = copysign(exp(_f0), _c);
                _f2 = _c * _f1 * _f1 + _f2;
                _f2 *= _c * _f0;
                _f1 *= c;
                _f1 *= _f0;`;
    enum transform = raw.replace("_f0", f0).replace("_f1", f1).replace("_f2", f2).replace("_c", c);
}

Note the line _f1 *= c;, I believe it should be _f1 *= _c;.

It happens to work because everywhere it is called the input variable happens to be named 'c' so the replace("_c", c) isn't strictly necessary in those cases.