pub unsafe extern "C" fn manifold_rect_mul(
mem: *mut c_void,
r: *mut ManifoldRect,
x: f64,
y: f64,
) -> *mut ManifoldRect
pub unsafe extern "C" fn manifold_rect_mul(
mem: *mut c_void,
r: *mut ManifoldRect,
x: f64,
y: f64,
) -> *mut ManifoldRect