https://doc.rust-lang.org/stable/nightly-rustc/rustc_trait_selection/infer/trait.InferCtxtBuilderExt.html
InferCtxtBuilderExt in rustc_trait_selection::infer - Rust
API documentation for the Rust `InferCtxtBuilderExt` trait in crate `rustc_trait_selection`.
rustctraitselectioninfer