[Pkg-rust-maintainers] Bug#1073048: rust-async-io: please accept building against async-lock v3

[Jonas Smedegaard]

Source: rust-async-io
Version: 2.3.3-1
Severity: grave
Justification: renders package unusable

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The very purpose of the experimental release of rust-async-io is to
test-build against newer branches of that family of packages.
Pleae therefore adapt the packaging to allow building against async-lock
v3.

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