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error[E0277]: the trait bound `&mut T: Clone` is not satisfied
  --> $DIR/issue-79458.rs:6:5
   |
LL | #[derive(Clone)]
   |          ----- in this derive macro expansion
LL | struct Foo<'a, T> {
LL |     bar: &'a mut T
   |     ^^^^^^^^^^^^^^ the trait `Clone` is not implemented for `&mut T`
   |
   = help: the following other types implement trait `Clone`:
             &T
             *const T
             *mut T
   = note: `Clone` is implemented for `&T`, but not for `&mut T`
   = note: this error originates in the derive macro `Clone` (in Nightly builds, run with -Z macro-backtrace for more info)

error: aborting due to previous error

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