Method check

crates/vm/src/convert/transmute_from.rs:17–28

(vm: &VirtualMachine, obj: &PyObject)

unsafe impl<T: PyPayload> TransmuteFromObject for PyRef<T> {
    fn check(vm: &VirtualMachine, obj: &PyObject) -> PyResult<()> {
        let class = T::class(&vm.ctx);
        if obj.fast_isinstance(class) {
            if obj.downcastable::<T>() {
                Ok(())
            } else {
                Err(vm.new_downcast_runtime_error(class, obj))
            }
        } else {
            Err(vm.new_downcast_type_error(class, obj))
        }
    }
}