warning: function cannot return without recursing
  --> $DIR/recursion-issue-92470.rs:12:1
   |
LL | fn encode<E: Encoder>(mut encoder: E) {
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ cannot return without recursing
...
LL |     encode(&mut encoder);
   |     -------------------- recursive call site
   |
   = help: a `loop` may express intention better if this is on purpose
   = note: `#[warn(unconditional_recursion)]` on by default

error: reached the recursion limit while instantiating `encode::<&mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut EncoderImpl>`
  --> $DIR/recursion-issue-92470.rs:15:5
   |
LL |     encode(&mut encoder);
   |     ^^^^^^^^^^^^^^^^^^^^
   |
note: `encode` defined here
  --> $DIR/recursion-issue-92470.rs:12:1
   |
LL | fn encode<E: Encoder>(mut encoder: E) {
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: aborting due to 1 previous error; 1 warning emitted