Function vstd::seq_lib::lemma_seq_take_update_commut2
source · pub proof fn lemma_seq_take_update_commut2<A>(s: Seq<A>, i: int, v: A, n: int)Expand description
ensures
0 <= n <= i < s.len() ==> #[trigger] s.update(i, v).take(n) =~= s.take(n),If i is a valid index after the first n indices of sequence s, updating sequence s at
index i with value v and then taking the first n elements is equivalent to just taking the first n
elements of s without the update.