Foreign Type rustc::ty::OpaqueListContents

extern {
    type OpaqueListContents;
}

🔬 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?

A dummy type used to force List to by unsized without requiring fat pointers