[][src]Existential Type rustc_metadata::decoder::

existential type <'tcx, 'a>: : Iterator<Item = T> + Captures<'tcx> + 'a;
🔬 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?