https://doc.rust-lang.org/beta/nightly-rustc/rustc_lint/lints/enum.UseLetUnderscoreIgnoreSuggestion.html
UseLetUnderscoreIgnoreSuggestion in rustc_lint::lints - Rust
API documentation for the Rust `UseLetUnderscoreIgnoreSuggestion` enum in crate `rustc_lint`.
rustclint