Function rustc::ty::tls::with_opt[][src]

pub fn with_opt<F, R>(f: F) -> R where
    F: for<'a, 'gcx, 'tcx> FnOnce(Option<TyCtxt<'a, 'gcx, 'tcx>>) -> R, 
🔬 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?

Allows access to the TyCtxt in the current ImplicitCtxt. The closure is passed None if there is no ImplicitCtxt available