error[E0308]: mismatched types
  --> $DIR/issue-32122-1.rs:16:24
   |
LL |     let _: *const u8 = &a;
   |            ---------   ^^ expected `*const u8`, found `&Foo`
   |            |
   |            expected due to this
   |
   = note: expected raw pointer `*const u8`
                found reference `&Foo`
help: consider dereferencing
   |
LL |     let _: *const u8 = &*a;
   |                         +

error: aborting due to 1 previous error

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