error[E0515]: cannot return value referencing temporary value
  --> $DIR/return-ref-mut-issue-46557.rs:5:5
   |
LL |     let ref mut x = 1234543;
   |                     ------- temporary value created here
LL |     x
   |     ^ returns a value referencing data owned by the current function

error: aborting due to 1 previous error

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