error[E0277]: `Foo` doesn't implement `Debug`
  --> $DIR/no-debug.rs:10:27
   |
LL |     println!("{:?} {:?}", Foo, Bar);
   |                           ^^^ `Foo` cannot be formatted using `{:?}`
   |
   = help: the trait `Debug` is not implemented for `Foo`
   = note: add `#[derive(Debug)]` to `Foo` or manually `impl Debug for Foo`
   = note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
help: consider annotating `Foo` with `#[derive(Debug)]`
   |
LL | #[derive(Debug)]
   |

error[E0277]: `Bar` doesn't implement `Debug`
  --> $DIR/no-debug.rs:10:32
   |
LL |     println!("{:?} {:?}", Foo, Bar);
   |                                ^^^ `Bar` cannot be formatted using `{:?}` because it doesn't implement `Debug`
   |
   = help: the trait `Debug` is not implemented for `Bar`
   = note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0277]: `Foo` doesn't implement `std::fmt::Display`
  --> $DIR/no-debug.rs:11:23
   |
LL |     println!("{} {}", Foo, Bar);
   |                       ^^^ `Foo` cannot be formatted with the default formatter
   |
   = help: the trait `std::fmt::Display` is not implemented for `Foo`
   = note: in format strings you may be able to use `{:?}` (or {:#?} for pretty-print) instead
   = note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0277]: `Bar` doesn't implement `std::fmt::Display`
  --> $DIR/no-debug.rs:11:28
   |
LL |     println!("{} {}", Foo, Bar);
   |                            ^^^ `Bar` cannot be formatted with the default formatter
   |
   = help: the trait `std::fmt::Display` is not implemented for `Bar`
   = note: in format strings you may be able to use `{:?}` (or {:#?} for pretty-print) instead
   = note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)

error: aborting due to 4 previous errors

For more information about this error, try `rustc --explain E0277`.