error[E0277]: `Self` doesn't implement `std::fmt::Display`
  --> $DIR/defaults-unsound-62211-1.rs:20:96
   |
LL |     type Output: Copy + Deref<Target = str> + AddAssign<&'static str> + From<Self> + Display = Self;
   |                                                                                                ^^^^ `Self` cannot be formatted with the default formatter
   |
   = note: in format strings you may be able to use `{:?}` (or {:#?} for pretty-print) instead
note: required by a bound in `UncheckedCopy::Output`
  --> $DIR/defaults-unsound-62211-1.rs:20:86
   |
LL |     type Output: Copy + Deref<Target = str> + AddAssign<&'static str> + From<Self> + Display = Self;
   |                                                                                      ^^^^^^^ required by this bound in `UncheckedCopy::Output`
help: consider further restricting `Self`
   |
LL | trait UncheckedCopy: Sized + std::fmt::Display {
   |                            +++++++++++++++++++

error[E0277]: cannot add-assign `&'static str` to `Self`
  --> $DIR/defaults-unsound-62211-1.rs:20:96
   |
LL |     type Output: Copy + Deref<Target = str> + AddAssign<&'static str> + From<Self> + Display = Self;
   |                                                                                                ^^^^ no implementation for `Self += &'static str`
   |
note: required by a bound in `UncheckedCopy::Output`
  --> $DIR/defaults-unsound-62211-1.rs:20:47
   |
LL |     type Output: Copy + Deref<Target = str> + AddAssign<&'static str> + From<Self> + Display = Self;
   |                                               ^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `UncheckedCopy::Output`
help: consider further restricting `Self`
   |
LL | trait UncheckedCopy: Sized + AddAssign<&'static str> {
   |                            +++++++++++++++++++++++++

error[E0277]: the trait bound `Self: Deref` is not satisfied
  --> $DIR/defaults-unsound-62211-1.rs:20:96
   |
LL |     type Output: Copy + Deref<Target = str> + AddAssign<&'static str> + From<Self> + Display = Self;
   |                                                                                                ^^^^ the trait `Deref` is not implemented for `Self`
   |
note: required by a bound in `UncheckedCopy::Output`
  --> $DIR/defaults-unsound-62211-1.rs:20:25
   |
LL |     type Output: Copy + Deref<Target = str> + AddAssign<&'static str> + From<Self> + Display = Self;
   |                         ^^^^^^^^^^^^^^^^^^^ required by this bound in `UncheckedCopy::Output`
help: consider further restricting `Self`
   |
LL | trait UncheckedCopy: Sized + Deref {
   |                            +++++++

error[E0277]: the trait bound `Self: Copy` is not satisfied
  --> $DIR/defaults-unsound-62211-1.rs:20:96
   |
LL |     type Output: Copy + Deref<Target = str> + AddAssign<&'static str> + From<Self> + Display = Self;
   |                                                                                                ^^^^ the trait `Copy` is not implemented for `Self`
   |
note: required by a bound in `UncheckedCopy::Output`
  --> $DIR/defaults-unsound-62211-1.rs:20:18
   |
LL |     type Output: Copy + Deref<Target = str> + AddAssign<&'static str> + From<Self> + Display = Self;
   |                  ^^^^ required by this bound in `UncheckedCopy::Output`
help: consider further restricting `Self`
   |
LL | trait UncheckedCopy: Sized + Copy {
   |                            ++++++

error: aborting due to 4 previous errors

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