error[E0275]: overflow evaluating the requirement `Box<&&&&&&&i32>: CoerceUnsized<Box<dyn Send>>`
  --> $DIR/unsize-overflow.rs:5:28
   |
LL |     let _: Box<dyn Send> = Box::new(&&&&&&&1);
   |                            ^^^^^^^^^^^^^^^^^^
   |
   = help: consider increasing the recursion limit by adding a `#![recursion_limit = "16"]` attribute to your crate (`unsize_overflow`)
   = note: required for the cast from `Box<&&&&&&&i32>` to `Box<dyn Send>`

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0275`.