[Pkg-rust-maintainers] Plan for updating (hypothetical future) firefox-esr versions in stable with changed build-deps?

[Angus Lees]

Dear SRMs,

My understanding is that Debian's new-ish plan is to update firefox-esr
versions in stable when there is a security update and the firefox-esr
upstream support window for the previous version has expired.
What is the plan for handling any new build-deps this new firefox-esr
release might require, and how will they also be merged into the existing
stable release?

Firefox upstream is discussing how things will work once a (part) of
Firefox build-depends on the Rust compiler (rustc.deb).  Rust has strong
backwards guarantees, but is otherwise rapidly evolving.  It is highly
likely that a newer upstream codebase will require a newer rustc, and I'm
wondering what the implications for our rustc packaging might be if we have
to plan for a newer rustc to be merged into an existing stable release.

I feel like I read the answer to this once before, but haven't been able to
find it described anywhere.  A pointer to an existing doc would be most
welcome.

 - Gus
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