Function syntax::fold::noop_fold_opt_expr [] [src]

pub fn noop_fold_opt_expr<T: Folder>(
    e: P<Expr>,
    folder: &mut T
) -> Option<P<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?