feature: initialize with const

[oligamiq]

When creating a vec, is it possible to use const fn so that the values can be prepared from the beginning?

[burrbull]

Only in nightly Rust for now.

[oligamiq]

Do you plan to achieve an equivalent in stable using macros?

[wetheredge]

Couldn't the for loop in Vec::from_array be replaced with ptr::copy_nonoverlapping::<T>(ptr::from_ref(&src).cast(), v.buffer.as_mut_ptr().cast(), M)? Then it could be const on 1.83.

Then it would be useful to mark String::from_utf8_unchecked const.

[burrbull]

I think discussion can be more alive if you form your suggestion into PR.