Constant syntax_pos::SPAN_DEBUG

pub const SPAN_DEBUG: LocalKey<Cell<fn(_: Span, _: &mut Formatter) -> Result>> = {
    #[inline]
    fn __init()
     -> Cell<fn(: Span, : &mut fmt::Formatter) -> fmt::Result> { loop  { } }
    unsafe fn __getit()
     ->
         ::option::Option<&'static ::cell::UnsafeCell<::option::Option<Cell<fn(:
                                                                                   Span,
                                                                               :
                                                                                   &mut fmt::Formatter)
                                                                                ->
                                                                                    fmt::Result>>>> {
                                                                                                        loop 
                                                                                                             {
                                                                                                        }
                                                                                                    }
    unsafe { <::thread::LocalKey>::new(__getit, __init) }
}

🔬 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?