Support slices in OnceRef and OnceBox

This is implemented through a new public-in-private `OncePointee` trait. If this was instead done with `impl OnceRef<[T]>`, the compiler fails to infer which methods we want to use. Because of the usage of `core::ptr::slice_from_raw_parts` in `const`, this change increases the MSRV to `1.64.0`.
matklad · Aug 10, 2023 · d7e6ed3 · d7e6ed3
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diff --git a/Cargo.toml b/Cargo.toml
@@ -4,7 +4,7 @@ version = "1.18.0"
 authors = ["Aleksey Kladov <aleksey.kladov@gmail.com>"]
 license = "MIT OR Apache-2.0"
 edition = "2021"
-rust-version = "1.60"
+rust-version = "1.64"
 
 description = "Single assignment cells and lazy values."
 readme = "README.md"