Function vstd::seq_lib::lemma_seq_skip_update_commut2
source · pub proof fn lemma_seq_skip_update_commut2<A>(s: Seq<A>, i: int, v: A, n: int)Expand description
ensures
0 <= i < n <= s.len() ==> s.update(i, v).skip(n) =~= s.skip(n),If i is a valid index in the first n indices of sequence s, updating sequence s at
index i with value v and then skipping the first n elements is equivalent to just skipping
the first n elements without the update.