What is the minimum nightly version that supports -Z build-std?

I'd like to update the min-sized-rust guide to prescribe using -Z build-std rather than Xargo (which has been in maintenance mode for many years).

As part of the guide, I like provide a minimum Rust version for a given feature. Does anyone know what nightly version was the first to support -Z build-std?


I think it is 2019-09-06, but I would not recommend using that, as it is likely quite buggy.

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Thanks for the information and context. Given the older versions are likely buggy, I think it's best to simply leave the minimum as nightly so users are encouraged to utilize the latest nightly.

Appreciate the help.