'when: X' -> 'when: X | bool' for Ansibl 2.8

roles/minetest/tasks/calc_vars.yml

@@ -7,7 +7,7 @@
 # only works if server run as root
     minetest_runas_user: root
     minetest_runas_group: root
-  when: is_rpi
+  when: is_rpi | bool
 
 # For other installs
 - name: Set some facts for other platforms

roles/minetest/tasks/main.yml

@@ -78,7 +78,7 @@
     name: minetest-server
     enabled: yes
     state: restarted
-  when: minetest_enabled
+  when: minetest_enabled | bool
 
 - name: Disable 'minetest-server' service
   systemd:

roles/minetest/tasks/minetest_install.yml

@@ -24,7 +24,7 @@
     line: "{{ item.line }}"
   with_items:
     - { regexp: '^mg_name = ', line: 'mg_name = flat' }
-  when: minetest_flat_world
+  when: minetest_flat_world | bool
 
 - name: Create /library/games/minetest/worlds/world
   file:

roles/minetest/tasks/rpi_minetest_install.yml

@@ -49,4 +49,4 @@
   with_items:
     - { src: 'minetest.conf.j2', dest: '/etc/minetest/minetest.conf' }
     - { src: 'minetest-server.service.j2', dest: '/etc/systemd/system/minetest-server.service' }
-  when: minetest_install
+  when: minetest_install | bool