enum_as_inner

enum_as_inner derives as_*(), as_*_mut(), into_*(), and is_*() accessor methods for each enum variant, returning Option. This eliminates full match expressions when you just need to extract one variant's data.

Its fork enum_try_as_inner returns Result instead, providing rich error info (expected vs actual variant plus original value recovery) — invaluable for state machines. derive-more also derives IsVariant, Unwrap, and TryUnwrap as a broader alternative. See rust-enum-crates.