[][src]Function syntax::ext::tt::macro_rules::check_matcher_core

fn check_matcher_core(
    sess: &ParseSess,
    features: &Features,
    attrs: &[Attribute],
    first_sets: &FirstSets,
    matcher: &[TokenTree],
    follow: &TokenSet
) -> TokenSet
🔬 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?