error: `ref` directly on a function argument is ignored. Consider using a reference type instead. --> toplevel_ref_arg.rs:7:15 | 7 | fn the_answer(ref mut x: u8) { | ^^^^^^^^^ | = note: `-D toplevel-ref-arg` implied by `-D warnings` error: `ref` on an entire `let` pattern is discouraged, take a reference with `&` instead --> toplevel_ref_arg.rs:18:7 | 18 | let ref x = 1; | ----^^^^^----- help: try `let x = &1;` | = note: `-D toplevel-ref-arg` implied by `-D warnings` error: `ref` on an entire `let` pattern is discouraged, take a reference with `&` instead --> toplevel_ref_arg.rs:20:7 | 20 | let ref y: (&_, u8) = (&1, 2); | ----^^^^^--------------------- help: try `let y: &(&_, u8) = &(&1, 2);` | = note: `-D toplevel-ref-arg` implied by `-D warnings` error: `ref` on an entire `let` pattern is discouraged, take a reference with `&` instead --> toplevel_ref_arg.rs:22:7 | 22 | let ref z = 1 + 2; | ----^^^^^--------- help: try `let z = &(1 + 2);` | = note: `-D toplevel-ref-arg` implied by `-D warnings` error: `ref` on an entire `let` pattern is discouraged, take a reference with `&` instead --> toplevel_ref_arg.rs:24:7 | 24 | let ref mut z = 1 + 2; | ----^^^^^^^^^--------- help: try `let z = &mut (1 + 2);` | = note: `-D toplevel-ref-arg` implied by `-D warnings` error: aborting due to previous error(s) To learn more, run the command again with --verbose.