Function geos::compute_voronoi

pub fn compute_voronoi<T: Borrow<Point<f64>>>(
    points: &[T],
    envelope: Option<&Geometry<'_>>,
    tolerance: f64,
    only_edges: bool
) -> Result<Vec<Polygon<f64>>, Error>

Available using the geo feature. About the tolerance argument, the underlying C library mentions:

snapping tolerance to use for improved robustness. A tolerance of 0.0 specifies that no snapping will take place. This argument can be finicky and is known to cause the algorithm to fail in several cases. If you’re using tolerance and getting a failure, try setting it to 0.0.