error[E0308]: mismatched types
  --> $DIR/dst-bad-coerce2.rs:15:33
   |
LL |     let f3: &mut Fat<[isize]> = f2;
   |             -----------------   ^^ types differ in mutability
   |             |
   |             expected due to this
   |
   = note: expected mutable reference `&mut Fat<[isize]>`
                      found reference `&Fat<[isize; 3]>`

error[E0308]: mismatched types
  --> $DIR/dst-bad-coerce2.rs:20:33
   |
LL |     let f3: &mut Fat<dyn Bar> = f2;
   |             -----------------   ^^ types differ in mutability
   |             |
   |             expected due to this
   |
   = note: expected mutable reference `&mut Fat<dyn Bar>`
                      found reference `&Fat<Foo>`

error[E0308]: mismatched types
  --> $DIR/dst-bad-coerce2.rs:25:31
   |
LL |     let f3: &mut ([isize],) = f2;
   |             ---------------   ^^ types differ in mutability
   |             |
   |             expected due to this
   |
   = note: expected mutable reference `&mut ([isize],)`
                      found reference `&([isize; 3],)`

error[E0308]: mismatched types
  --> $DIR/dst-bad-coerce2.rs:30:31
   |
LL |     let f3: &mut (dyn Bar,) = f2;
   |             ---------------   ^^ types differ in mutability
   |             |
   |             expected due to this
   |
   = note: expected mutable reference `&mut (dyn Bar,)`
                      found reference `&(Foo,)`

error: aborting due to 4 previous errors

For more information about this error, try `rustc --explain E0308`.