Macro syntax::span_help [] [src]

macro_rules! span_help {
    ($err:expr, $span:expr, $($message:tt)*) => { ... };
}
🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, and unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?