Summary

Original issue: #4121
Implementation: #9175
Documentation: https://doc.rust-lang.org/nightly/cargo/reference/unstable.html#configurable-env

The -Z configurable-env option enables reading the [env] table from config which will set the specified environment variables.

Unresolved issues

• Interaction with environment variables cargo sets itself (some can be overridden, some cannot, for example anything set after fill_env like build-script env vars).

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