Static rustc_lint::builtin::NO_MANGLE_GENERIC_ITEMS[]

static NO_MANGLE_GENERIC_ITEMS: &Lint = &::lint::Lint{name: "NO_MANGLE_GENERIC_ITEMS",
              default_level: ::lint::Warn,
              desc: "generic items must be mangled",
              edition_deny: None,}
🔬 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?