Function syntax::feature_gate::maybe_stage_features[][src]

fn maybe_stage_features(
    span_handler: &Handler,
    krate: &Crate,
    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?