[]Constant syntax::std_inject::INJECTED_CRATE_NAME

const INJECTED_CRATE_NAME: LocalKey<Cell<Option<&'static str>>>
🔬 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?