ansible loop with persistence of result from last

inner.yml

- debug:
    msg: '{{ last|default("") }} -> {{ item }}'

- set_fact:
    last: '{{ item }}'

test.yml

- hosts: localhost
  connection: local
  gather_facts: no
  vars:
    mylist:
    - a
    - b
    - c
  tasks:
    - include_tasks: inner.yml
      loop: '{{ mylist }}'