Function syntax::fold::noop_fold_expr

pub fn noop_fold_expr<T: Folder>(
    Expr { id: id, node: node, span: span, attrs: attrs }: Expr, 
    folder: &mut T
) -> Expr

🔬 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?