error: regex parse error:
           [a-z+
           ^
       error: unclosed character class
 --> tests/ui/bad_regex.rs:7:13
  |
7 |             "[a-z+"
  |             ^^^^^^^

error: Empty regex is not supported
  --> tests/ui/bad_regex.rs:15:13
   |
15 |             ""
   |             ^^

error: expected string literal
  --> tests/ui/bad_regex.rs:23:13
   |
23 |             123
   |             ^^^

error: unexpected end of input, expected string literal
  --> tests/ui/bad_regex.rs:31:9
   |
31 |         },
   |         ^

error: Unknown word: regex
  --> tests/ui/bad_regex.rs:37:9
   |
37 |         regex,
   |         ^^^^^