Constant rustc::ty::layout::FAT_PTR_EXTRA

pub const FAT_PTR_EXTRA: usize = 1

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

The second half of a fat pointer. - For a trait object, this is the address of the vtable. - For a slice, this is the length.