ices/92470.rs: fixed with errors

[github-actions]

Issue: rust-lang/rust#92470

fn main() {
    encode(&mut EncoderImpl);
}

pub trait Encoder {
    type W;

    fn writer(&self) -> Self::W;
}

fn encode<E: Encoder>(mut encoder: E) {
    encoder.writer();
    encode(&mut encoder);
}

struct EncoderImpl;

impl Encoder for EncoderImpl {
    type W = ();

    fn writer(&self) {}
}

impl<'a, T: Encoder> Encoder for &'a mut T {
    type W = T::W;

    fn writer(&self) -> Self::W {
        panic!()
    }
}

=== stdout ===
=== stderr ===
warning: function cannot return without recursing
  --> /home/runner/work/glacier/glacier/ices/92470.rs:11:1
   |
11 | fn encode<E: Encoder>(mut encoder: E) {
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ cannot return without recursing
12 |     encoder.writer();
13 |     encode(&mut encoder);
   |     -------------------- recursive call site
   |
   = note: `#[warn(unconditional_recursion)]` on by default
   = help: a `loop` may express intention better if this is on purpose

error[E0275]: overflow evaluating the requirement `<EncoderImpl as Encoder>::W`
  |
  = help: consider increasing the recursion limit by adding a `#![recursion_limit = "256"]` attribute to your crate (`92470`)

error: aborting due to previous error; 1 warning emitted

For more information about this error, try `rustc --explain E0275`.
==============