Function syntax::feature_gate::leveled_feature_err[][src]

fn leveled_feature_err<'a>(
    sess: &'a ParseSess,
    feature: &str,
    span: Span,
    issue: GateIssue,
    explain: &str,
    level: GateStrength
) -> DiagnosticBuilder<'a>
🔬 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?