error: unexpected end of macro invocation
 --> tests/trybuild/indices/needs_to_provide_indices.rs:6:32
  |
6 |     let result = indices!(slice);
  |                                ^ missing tokens in macro arguments
  |
note: while trying to match `,`
 --> src/lib.rs
  |
  |     ($slice:expr, $index1:expr) => {{
  |                 ^