File: derive-debug.stderr

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error[E0277]: `U` doesn't implement `std::fmt::Debug`
  --> $DIR/derive-debug.rs:11:36
   |
11 |     #[derivative(Debug(format_with="std::fmt::Debug::fmt"))]
   |                                    ^^^^^^^^^^^^^^^^^^^^^^ `U` cannot be formatted using `{:?}` because it doesn't implement `std::fmt::Debug`
   |
   = help: the trait `std::fmt::Debug` is not implemented for `U`
   = help: consider adding a `where U: std::fmt::Debug` bound
   = note: required by `std::fmt::Debug::fmt`