Constant rustc_mir::borrow_check::nll::universal_regions::FR

const FR: NLLRegionVariableOrigin = NLLRegionVariableOrigin::FreeRegion

🔬 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?