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67395551d0
get rid of a whole bunch of unnecessary rustc_const_unstable attributes In general, when a `const fn` is still unstable, it doesn't need a `#[rustc_const_unstable]` attribute. The only exception is functions that internally use things that can't be used in stable const fn yet. So this gets rid of a whole bunch of `#[rustc_const_unstable]` in libcore.