librust-libphosh-sys-dev is declared Multi-Arch: same, but fails to
coinstall.

The files
 * /usr/share/cargo/registry/libphosh-sys-0.0.7/GLib-2.0.gir
 * /usr/share/cargo/registry/libphosh-sys-0.0.7/Pango-1.0.gir
are shared by librust-libphosh-sys-dev version 0.0.7-4 as present in
forky, version 0.0.7-4 as present in forky, version 0.0.7-5 as present
in unstable and version 0.0.7-4 as present in forky with varying
content.

Please ensure that shared files have bit-identical content across
architectures, move architecture-dependent files to
architecture-dependent paths or remove the Multi-Arch: same field.

Kind regards

Helmut Grohne