[Pkg-rust-maintainers] Bug#1064643: rust-pulldown-cmark: please upgrade to newer branch v0.10

[Peter Green]

Reading the upstream changelog it seems that a load of
"breaking changes" came in 0.10 with those since then
being relatively minor. I've taken a priliminary look
through the rdeps and most of the important ones seem
to have updated to at least 0.10 upstream.

So my gut feeling is to start preparing an update to the
latest version (0.12) and see how things go. Does anyone
else have any opinions?

elan
   only uses pulldown-cmark at all because of a debian patch.

mdbook
   uses 0.10 and has a comment not to upgrade because it's
   "part of the public API" but I don't think that is
   massively relavent to Debian.

rust-cursive-core
   upstream release uses 0.11, debian is currently downpatching
   upstream git uses 0.12 and upstream made no code changes
   when switching to 0.12.

rust-ruma-common
   upstream seems to have moved use of pulldown-cmark from
   the ruma-common crate to the ruma-events crate and
   updated to the latest version, code changes seem minimal.


rust-skeptic
   still uses 0.9 upstream. Seems kinda dead upstream.
   no rdeps.

rust-upstream-ontologist
   upstream has an optimistic dependency allowing
   any version newer than 0.9

rust-version-sync
   latest upstream release uses 0.9, upstream git
   uses 0.11, fairly minor changes upstream when
   switching from 0.9 to 0.11

rustup
   version in debian uses 0.9, upstream git uses
   0.12. Upstream changes seem moderate.