derive(Debug) does not compile

[jean-airoldie]

Hi,

The following does not compile:

#[ouroboros::self_referencing]
#[derive(Debug)]
pub struct Struct<'a> {
    bytes: Vec<u8>,
    #[borrows(bytes)]
    slice: &'a [u8],
}

error: bad syntax
 --> src/lib.rs:4:1
  |
4 | #[derive(Debug)]
  | ^^^^^^^^^^^^^^^^

error: could not compile `ouroboros-private` (lib) due to previous error

Neither does this:

#[derive(Debug)]
#[ouroboros::self_referencing]
pub struct Struct<'a> {
    bytes: Vec<u8>,
    #[borrows(bytes)]
    slice: &'a [u8],
}

    Checking ouroboros-private v0.1.0 (/home/maxence/bug/ouroboros-private)
error[E0609]: no field `bytes` on type `&Struct<'a>`
 --> src/lib.rs:4:5
  |
4 |     bytes: Vec<u8>,
  |     ^^^^^ unknown field

error[E0609]: no field `slice` on type `&Struct<'a>`
 --> src/lib.rs:6:5
  |
6 |     slice: &'a [u8],
  |     ^^^^^ unknown field

For more information about this error, try `rustc --explain E0609`.
error: could not compile `ouroboros-private` (lib) due to 2 previous errors

Im using rustc 1.72.0-nightly (1c53407e8 2023-05-28)

[kpreid]

You might want to write a manual impl fmt::Debug for Struct<'_> anyway, because the derive, if it succeeded, would print the entire contents of bytes and the entire contents of the slice of it, duplicating some data.

[jean-airoldie]

Good point.

[circuitsacul]

But this is still a bug...