I can't use closures in and_then

[YYMMYB]

I have implemented my own slice, but I encountered an error in the image (compilation failed).
I only implemented the traits shown in the image.

The following is the error message given by the compiler

error[E0599]: no method named `parse_next` found for struct `AndThen` in the current scope
  --> src\main.rs:21:42
   |
21 |     take(1usize).and_then(|sl| todo(sl)).parse_next(sl);
   |     ------------                         ^^^^^^^^^^ method not found in `AndThen<impl Parser<_, <_ as Stream>::Slice, _>, {[email protected]:21:27}, _, _, _, _>`
   |     |
   |     method `parse_next` is available on `impl Parser<_, <_ as Stream>::Slice, _>`

Did I miss implementing some traits? How can I use closures in and_then?

This is the test code on rust playground.

[epage]

Type inference generally misunderstands parser closures, so you probably need to do |sl: &mut _|