Yuki Okushi 7432588e5d
Rollup merge of #89258 - est31:const_char_convert, r=oli-obk
Make char conversion functions unstably const

The char conversion functions like `char::from_u32` do trivial computations and can easily be converted into const fns. Only smaller tricks are needed to avoid non-const standard library functions like `Result::ok` or `bool::then_some`.

Tracking issue: https://github.com/rust-lang/rust/issues/89259
2021-11-19 13:06:31 +09:00
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