[][src]Function syntax::feature_gate::feature_err

pub fn feature_err<'a>(
    sess: &'a ParseSess,
    feature: Symbol,
    span: impl Into<MultiSpan>,
    explain: &str
) -> DiagnosticBuilder<'a>
⚙️ This is an internal compiler API. (rustc_private)

This crate is being loaded from the sysroot, a permanently unstable location for private compiler dependencies. It is not intended for general use. Prefer using a public version of this crate from crates.io via Cargo.toml.