Implementing an empty contract gives a false warning in an autogenerated file

[ironcev]

When implementing an empty contract like:

abi Abi { }
impl Abi for Contract { }

this warning is emitted although the above code is perfectly valid:

warning
 --> <autogenerated>:1:17
  |
0 |  pub fn __entry() {
1 |             let method_name = decode_first_param::<str>();
  |                 ----------- This declaration is never used.
2 |             
3 |             __revert(123);