Function syntax::feature_gate::check_crate

pub fn check_crate(
    krate: &Crate, 
    sess: &ParseSess, 
    features: &Features, 
    plugin_attributes: &[(String, AttributeType)], 
    unstable: UnstableFeatures
)

🔬 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?