[Pkg-rust-maintainers] Bug#1074114: librust-async-global-executor-dev: please accept rust-async-lock both v2 and v3 as dependency

[Jonas Smedegaard]

Package: librust-async-global-executor-dev
Version: 2.4.1-2
Severity: normal

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Thanks for solving bug#1074067. The way that was solved is helpful when
all the constellations involved in the smol and async-* crate migration
are aligned.

Now, please consider accepting *both* v2 and v3 of rust-async-lock as
dependency of rust-async-global-executor. That should be helpful for
more granular testing, breaking that relatively large migration into
smaller parts.

I recommend patching the upstream part to declare a dependency like
this: ">= 2.8.0, <= 3".  That way you relax downwards only as low as is
concretely tested using the actual version now in unstable, and form a
single range upwards for the whole of the branch within which upstream
declares a dependency on more narrowly.

I recommend declaring a Debian dependency like this:
"librust-async-lock-dev (<< 4)".  That similarly declares a single range
which in Debian requires being fully loose either downwards or upwards,
which I find safer to do downwards, since the past is know (it will fail
due to other unsatisfiable dependencies as well) whereas being sloppy
about the future may cause future problems discovered too late.

Thanks for considering.

 - Jonas

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