[defanor]

Steps to reproduce, once you have cargo and rustc from Debian stable repositories: cargo init && cargo add clap && cargo run. The following happens:

    error: package `anstream v0.6.4` cannot be built because it requires rustc 1.70.0 or newer, while the currently active rustc version is 1.63.0
    Either upgrade to rustc 1.70.0 or newer, or use
    cargo update -p anstream@0.6.4 --precise ver
    where `ver` is the latest version of `anstream` supporting rustc 1.63.0

[estebank]

For what is worth, you can use https://lib.rs to see the earliest version a crate supports. For Rust 1.63.0, you will have to rely on Clap 4.0.32 from December 2022, instead of anything newer (which only support 1.64.0+): https://lib.rs/crates/clap/versions

For anstream, the situation seems more difficult for you, as it doesn't seem that there's any (non-yanked?) release that supports <1.64.0: https://lib.rs/crates/anstream/versions

[defanor]

Thanks! I was looking for a page like that on docs.rs, crates.io, and possibly on lib.rs as well, but missed it; that is likely to be useful in the future. Actually now I see it on crates.io as well, <https://crates.io/crates/anstream/versions>. Or maybe I saw it before, and just have not found versions <= 1.63.