Weird behavior when cargo add dep (workspace) to dependencies

[cxw620]

Problem

The workspace dependencies:

The Cargo.lock

However, when I run the command like cargo add --package my_package chrono --features std, cargo complains:

    Updating crates.io index
      Adding chrono (workspace) to dependencies
error: unrecognized feature for crate chrono: std
disabled features:
    rustc-serialize, serde

rustc-serialize, serde are actually the features of chrono@=0.4.0 instead of chrono@=0.4.38.

workspace.resolver is set to "3", edition 2024.

Steps

No response

Possible Solution(s)

No response

Notes

No response

Version

[epage]

Can you share your workspace.dependencies?

Most likely what is happening is your version requirement in workspace.dependencies is low enough to include a version with rustc-serialize and serde.

Dependencies specify a version requirement which includes support for a range of supported versions. To aid users in supporting the full range of their version requirement, cargo add only validates against and lists features for the lowest version within the range, making the assumption that features are not removed as that is a breaking change.

See also

• cargo add "package@*" evaluates features of wrong version #14832
• cargo add cannot enable features if version="*" in Cargo.toml #14648

[cxw620]

Can you share your workspace.dependencies?

chrono = { version = "0.4", default-features = false }.

If I set to 0.4.38 instead of 0.4, it works well.

According to your explanation in #14648, the oldest version compatible with 0.4 is 0.4.0...

Thank you for your reply and I will close the issue.