error: `ref` on an entire `let` pattern is discouraged, take a reference with `&` instead
  --> $DIR/toplevel_ref_arg.rs:11:9
   |
LL |     let ref x = 1;
   |     ----^^^^^----- help: try: `let x = &1;`
   |
   = note: `-D clippy::toplevel-ref-arg` implied by `-D warnings`

error: `ref` on an entire `let` pattern is discouraged, take a reference with `&` instead
  --> $DIR/toplevel_ref_arg.rs:13:9
   |
LL |     let ref y: (&_, u8) = (&1, 2);
   |     ----^^^^^--------------------- help: try: `let y: &(&_, u8) = &(&1, 2);`

error: `ref` on an entire `let` pattern is discouraged, take a reference with `&` instead
  --> $DIR/toplevel_ref_arg.rs:15:9
   |
LL |     let ref z = 1 + 2;
   |     ----^^^^^--------- help: try: `let z = &(1 + 2);`

error: `ref` on an entire `let` pattern is discouraged, take a reference with `&` instead
  --> $DIR/toplevel_ref_arg.rs:17:9
   |
LL |     let ref mut z = 1 + 2;
   |     ----^^^^^^^^^--------- help: try: `let z = &mut (1 + 2);`

error: aborting due to 4 previous errors