rust-pangocairo: 0.16.3 autopkgtest failures

[Simon Chopin]

The rust-pangocairo autopkgtests fail with the following error:

--> tests/check_gir.rs:6:16
  |
6 | println!("{res}");
  | ^^^ `Errors` cannot be formatted with the default formatter
  |
  = help: the trait `std::fmt::Display` is not implemented for `Errors`
  = note: in format strings you may be able to use `{:?}` (or {:#?} for pretty-print) instead
  = note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)

For more information about this error, try `rustc --explain E0277`.
error: could not compile `pangocairo` due to previous error

It's due to the gir-format-check crate being too old in the archive, its Errors struct not implementing Display until the 0.1.2 version.

[Simon Chopin (schopin)]

I've pushed an updated version of gir-format-check to the Debian Rust debcargo-conf repo, we now "just" need to wait for a DD familiar with that team's processes to sponsor it. I'd rather not upload to Ubuntu directly.

[Simon Chopin (schopin)]

It also affects the rust-gio package in the same way.