https://doc.rust-lang.org/beta/nightly-rustc/rustc_trait_selection/infer/enum.RegionResolutionError.html
RegionResolutionError in rustc_trait_selection::infer - Rust
API documentation for the Rust `RegionResolutionError` enum in crate `rustc_trait_selection`.
rustctraitselectioninfer
https://doc.rust-lang.org/stable/nightly-rustc/rustc_infer/infer/lexical_region_resolve/enum.RegionResolutionError.html
RegionResolutionError in rustc_infer::infer::lexical_region_resolve - Rust
API documentation for the Rust `RegionResolutionError` enum in crate `rustc_infer`.
rustcinferlexicalregionresolve