[Pkg-rust-maintainers] Bug#1050185: rust-derive-builder-core - depends on old version of darling.

[Peter Green]

Package: rust-derive-builder-core
Version: 0.12.0-1
Severity: serious

Recently a new version of the darling crates was uploaded,
(Alexander Kajil prepared the uploads, Sylvestre uploaded
darling-core and I uploaded the rest of the darling crates).

Most of the reverse dependencies either already had uploads
prepared, or I was able to prepare uploads. Unfortunately
things were not so fortunate with derive-builder-core.

Bumping darling generally also implies bumping syn,
otherwise one runs into issues. We currently have both
versions 1.x and 2.x of syn in Debian, so this is not
an issue in itself but it means more API changes.

I tried to patch derive-builder-core for the new syn,
but I failed. Looking upstream it seems they are also
currently stuck.

https://github.com/colin-kiegel/rust-derive-builder/issues/292