src/test/ui/rfc-2361-dbg-macro/dbg-macro-requires-debug.stderr

   1 error[E0277]: `NotDebug` doesn't implement `Debug`
   2   --> $DIR/dbg-macro-requires-debug.rs:6:23
   3    |
   4 LL |     let _: NotDebug = dbg!(NotDebug);
   5    |                       ^^^^^^^^^^^^^^ `NotDebug` cannot be formatted using `{:?}`
   6    |
   7    = help: the trait `Debug` is not implemented for `NotDebug`
   8    = note: add `#[derive(Debug)]` to `NotDebug` or manually `impl Debug for NotDebug`
   9    = note: this error originates in the macro `$crate::format_args_nl` (in Nightly builds, run with -Z macro-backtrace for more info)
  10
  11 error: aborting due to previous error
  12
  13 For more information about this error, try `rustc --explain E0277`.