Support variables in `Cargo.toml`?

tools and infrastructure cargo
#1

This is very useful, especially in the workspace scenario.

Just like java maven: Maven – Introduction to the POM

For example:

# Cargo.toml

[workspace]
members = ["foo", "bar"]

[variables]
foo_name = "foo"
foo_version = "0.1.0"

# foo/Cargo.toml

[package]
name = "${foo_name}"
version = "${foo_version}"

# bar/Cargo.toml

[package]
name = "bar"
version = "0.1.0"

[dependencies]
${foo_name} = { version = "${foo_version}", path = "../${foo_name}" }

The variable foo_name and foo_version can be shared between packages. Therefore, it is very convenient to modify.

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#2

I known the workspace.package, but he is not flexible.

At least, my example can not be done with workspace.package.

#3

This design has been rejected already, and Cargo decided to add workspace inheritance instead.

https://rust-lang.github.io/rfcs/2906-cargo-workspace-deduplicate.html

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