Function powc

crates/vm/src/builtins/complex.rs:175–184

num-complex changed their powc() implementation in 0.4.4, making it incompatible with what the regression tests expect. this is that old formula.

(a: Complex64, exp: Complex64)

// num-complex changed their powc() implementation in 0.4.4, making it incompatible
// with what the regression tests expect. this is that old formula.
fn powc(a: Complex64, exp: Complex64) -> Complex64 {
    let (r, theta) = a.to_polar();
    if r.is_zero() {
        return Complex64::new(r, r);
    }
    Complex64::from_polar(
        r.powf(exp.re) * (-exp.im * theta).exp(),
        exp.re * theta + exp.im * r.ln(),
    )
}

impl Constructor for PyComplex {
    type Args = ComplexArgs;