use once_cell::sync::Lazy;

[mghase]

use once_cell::sync::Lazy is alredy merged in std lib.

use can use
std::lazy:LazyCell
std::cell::LazyCellCopy item path

[rushmorem]

@mghase It's merged but for now it's nightly only so we can't use it yet. OnceLock, however, became stable in v1.70.0. I have just put up a PR to migrate to that instead of once_cell::sync::OnceCell.