[bug#54439] Rust: Add Rust 1.59, set default to 1.59.

[Maxime Devos]

Paul Alesius schreef op vr 18-03-2022 om 01:21 [+0100]:
> +(define rust-1.59
> +  (rust-bootstrapped-package
> +   rust-1.58 "1.59.0" 
> "1yc5bwcbmbwyvpfq7zvra78l0r8y3lbv60kbr62fzz2vx2pfxj57"))

I'm wondering, does rust@1.59 need to be built against rust@1.58, or
could it be built against an earlier version rust@1.57?  I would prefer
the latter to avoid increasing the bootstrapping chain further.

Greetings,
Maxime.

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