error: Invalid JSON value.

       Expected one of:
       - String literal: "hello"
       - Number: 42 or 3.14
       - Boolean: true or false
       - null
       - Object: { "key": value }
       - Array: [1, 2, 3]
       - Expression implementing ToJson (String, i32, bool, Vec<T>, etc.)
       - Type hint: str(expr), int(expr), float(expr), bool(expr)

       Original error: unexpected end of input, expected an expression
 --> tests/ui/response/ok_empty.rs:5:17
  |
5 |     let _resp = ok!();
  |                 ^^^^^
  |
  = note: this error originates in the macro `ok` (in Nightly builds, run with -Z macro-backtrace for more info)
