Function clippy_utils::search_same

pub fn search_same<T, Hash, Eq>(
    exprs: &[T], 
    hash: Hash, 
    eq: Eq
) -> Vec<(&T, &T)> where
    Hash: Fn(&T) -> u64,
    Eq: Fn(&T, &T) -> bool, 

returns list of all pairs (a, b) from exprs such that eq(a, b) hash must be comformed with eq