Method _send

crates/vm/src/frame.rs:6804–6819

(
        &self,
        jen: &PyObject,
        val: PyObjectRef,
        vm: &VirtualMachine,
    )

    }

    fn _send(
        &self,
        jen: &PyObject,
        val: PyObjectRef,
        vm: &VirtualMachine,
    ) -> PyResult<PyIterReturn> {
        match self.builtin_coro(jen) {
            Some(coro) => coro.send(jen, val, vm),
            // TODO: turn return type to PyResult<PyIterReturn> then ExecutionResult will be simplified
            None if vm.is_none(&val) => PyIter::new(jen).next(vm),
            None => {
                let meth = jen.get_attr("send", vm)?;
                PyIterReturn::from_pyresult(meth.call((val,), vm), vm)
            }
        }
    }

    fn execute_unpack_ex(&mut self, vm: &VirtualMachine, before: u8, after: u8) -> FrameResult {
        let (before, after) = (before as usize, after as usize);