fuzzypixelz / zenoh-tilde-req-poc

Zenoh "Tilde" version requirement (e.g. ~4.4) proof of concept

From Dependency Resolution:

Avoid overly narrow version requirements if possible. For example, if you specify a tilde requirement like bar="~1.3", and another package specifies a requirement of bar="1.4", this will fail to resolve, even though minor releases should be compatible.

Running cargo +nightly -Z bindeps tree fails with:

error: failed to select a version for `clap`.
    ... required by package `zenohd v0.11.0-dev (/path/to/zenoh-tilde-req-poc/zenoh/zenohd)`
    ... which satisfies path dependency `zenohd` (locked to 0.11.0-dev) of package `zenoh-tilde-req-poc v0.1.0 (/path/to/zenoh-tilde-req-poc)`
versions that meet the requirements `~4.4` are: 4.4.18, 4.4.17, 4.4.16, 4.4.15, 4.4.14, 4.4.13, 4.4.12, 4.4.11, 4.4.10, 4.4.9, 4.4.8, 4.4.7, 4.4.6, 4.4.5, 4.4.4, 4.4.3, 4.4.2, 4.4.1, 4.4.0

all possible versions conflict with previously selected packages.

  previously selected package `clap v4.5.1`
    ... which satisfies dependency `clap = "^4.5.1"` of package `zenoh-tilde-req-poc v0.1.0 (/path/to/zenoh-tilde-req-poc)`

failed to select a version for `clap` which could resolve this conflict

This is because zenohd's clap version is set to ~4.4, while this crate specifies 4.5.1. This illustrates that pinning the minor (or patch) of dependency version can easily cause the Cargo resolver to fail in user crates.