error: prefix `c` is unknown
  --> $DIR/basic.rs:8:27
   |
LL |     assert_eq!(b"test\0", c"test".to_bytes_with_nul());
   |                           ^ unknown prefix
   |
   = note: prefixed identifiers and literals are reserved since Rust 2021
help: consider inserting whitespace here
   |
LL |     assert_eq!(b"test\0", c "test".to_bytes_with_nul());
   |                            +

error: no rules expected the token `"test"`
  --> $DIR/basic.rs:8:28
   |
LL |     assert_eq!(b"test\0", c"test".to_bytes_with_nul());
   |                            -^^^^^
   |                            |
   |                            no rules expected this token in macro call
   |                            help: missing comma here
   |
   = note: while trying to match sequence start

error: aborting due to 2 previous errors