error: this binding can be a slice pattern to avoid indexing
  --> $DIR/slice_indexing_in_macro.rs:23:21
   |
LL |         if let Some(slice) = slice;
   |                     ^^^^^
   |
note: the lint level is defined here
  --> $DIR/slice_indexing_in_macro.rs:1:9
   |
LL | #![deny(clippy::index_refutable_slice)]
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
help: try using a slice pattern here
   |
LL |         if let Some([slice_0, ..]) = slice;
   |                     ~~~~~~~~~~~~~
help: and replace the index expressions here
   |
LL |             println!("{}", slice_0);
   |                            ~~~~~~~

error: aborting due to previous error