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

   1 error[E0277]: `NotDebug` doesn't implement `std::fmt::Debug`
   2   --> $DIR/dbg-macro-requires-debug.rs:8:23
   3    |
   4 LL |     let _: NotDebug = dbg!(NotDebug);
   5    |                       ^^^^^^^^^^^^^^ `NotDebug` cannot be formatted using `{:?}`
   6    |
   7    = help: the trait `std::fmt::Debug` is not implemented for `NotDebug`
   8    = note: add `#[derive(Debug)]` or manually implement `std::fmt::Debug`
   9    = note: required because of the requirements on the impl of `std::fmt::Debug` for `&NotDebug`
  10    = note: required by `std::fmt::Debug::fmt`
  11    = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
  12
  13 error: aborting due to previous error
  14
  15 For more information about this error, try `rustc --explain E0277`.