Function syntax::fold::noop_fold_generics

pub fn noop_fold_generics<T: Folder>(
    Generics { ty_params: ty_params, lifetimes: lifetimes, where_clause: where_clause, span: span }: Generics, 
    fld: &mut T
) -> Generics

🔬 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?