This particular case is because array delegates to slice for Eq, and slice has the pointer comparison - though it looks like there's some churn here with 'guara

This particular case is because array delegates to slice for Eq, and slice has the pointer comparison - though it looks like there's some churn here with 'guaranteed_eq' so it may be fixed soon [1]. 1: https://doc.rust-lang.org/src/core/slice/mod.rs.html#6610 https://doc.rust-lang.org/src/core/slice/mod.rs.html#6610