error[E0515]: cannot return value referencing function parameter `x`
  --> $DIR/borrowck-return-variable-on-stack-via-clone.rs:7:5
   |
LL |     (&x).clone()
   |     ----^^^^^^^^
   |     |
   |     returns a value referencing data owned by the current function
   |     `x` is borrowed here

error: aborting due to previous error

For more information about this error, try `rustc --explain E0515`.
