https://doc.rust-lang.org/nightly/nightly-rustc/rustc_trait_selection/traits/coherence/enum.TrackAmbiguityCauses.html
TrackAmbiguityCauses in rustc_trait_selection::traits::coherence - Rust
API documentation for the Rust `TrackAmbiguityCauses` enum in crate `rustc_trait_selection`.
rustctraitselectioncoherence