error: using `to_string` in `fmt::Display` implementation might lead to infinite recursion
  --> $DIR/to_string_in_display.rs:25:25
   |
LL |         write!(f, "{}", self.to_string())
   |                         ^^^^^^^^^^^^^^^^
   |
   = note: `-D clippy::to-string-in-display` implied by `-D warnings`

error: aborting due to previous error