update rustBeta and rustNightly #21800
Merged
+81
−23
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Motivation for this change
rustBeta is out of date, cargo as well. Nightly fails to build currently.
As the rust code has changed quite a lot recently, i needed to add more workaround to make it compile.
Those should be merged up to rustc.nix once stable hits those issues.
@Ericson2314