error: `to_string` applied to a type that implements `Display` in `println!` args
  --> tests/ui/to_string_in_format_args_incremental.rs:7:21
   |
LL |     println!("{}", s.to_string());
   |                     ^^^^^^^^^^^^ help: remove this
   |
   = note: `-D clippy::to-string-in-format-args` implied by `-D warnings`
   = help: to override `-D warnings` add `#[allow(clippy::to_string_in_format_args)]`

error: aborting due to 1 previous error