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Clarify cargo resolver behavior in a workspace. #267

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Oct 5, 2021
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Clarify cargo resolver behavior in a workspace. #267

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8 changes: 8 additions & 0 deletions src/rust-2021/default-cargo-resolver.md
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Expand Up @@ -12,12 +12,20 @@ which can be activated with `resolver = "2"` in `Cargo.toml`.
Starting in Rust 2021, this will be the default.
That is, writing `edition = "2021"` in `Cargo.toml` will imply `resolver = "2"`.

The resolver is a global setting for a [workspace], and the setting is ignored in dependencies.
The setting is only honored for the top-level package of the workspace.
If you are using a [virtual workspace], you will still need to explicitly set the [`resolver` field]
in the `[workspace]` definition if you want to opt-in to the new resolver.

The new feature resolver no longer merges all requested features for
crates that are depended on in multiple ways.
See [the announcement of Rust 1.51][5] for details.

[4]: ../../cargo/reference/resolver.html#feature-resolver-version-2
[5]: https://blog.rust-lang.org/2021/03/25/Rust-1.51.0.html#cargos-new-feature-resolver
[workspace]: ../../cargo/reference/workspaces.html
[virtual workspace]: ../../cargo/reference/workspaces.html#virtual-manifest
[`resolver` field]: ../../cargo/reference/resolver.html#resolver-versions

## Migration

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