From 9b28f1f5d931b727f2a06270314f2c2a8a5494bb Mon Sep 17 00:00:00 2001
From: Vasili <vasili.revelas@gmail.com>
Date: Fri, 14 Feb 2020 23:50:52 +0200
Subject: [PATCH] Fix incorrect "Could not match supplied host pattern" warning
 (#66764) (#67432)

---
 changelogs/fragments/66764-host-pattern-warning.yml |  2 ++
 lib/ansible/playbook/play.py                        |  2 +-
 .../include_import/empty_group_warning/playbook.yml | 13 +++++++++++++
 .../include_import/empty_group_warning/tasks.yml    |  3 +++
 test/integration/targets/include_import/runme.sh    |  3 +++
 5 files changed, 22 insertions(+), 1 deletion(-)
 create mode 100644 changelogs/fragments/66764-host-pattern-warning.yml
 create mode 100644 test/integration/targets/include_import/empty_group_warning/playbook.yml
 create mode 100644 test/integration/targets/include_import/empty_group_warning/tasks.yml

diff --git a/changelogs/fragments/66764-host-pattern-warning.yml b/changelogs/fragments/66764-host-pattern-warning.yml
new file mode 100644
index 00000000000..df76073e0ef
--- /dev/null
+++ b/changelogs/fragments/66764-host-pattern-warning.yml
@@ -0,0 +1,2 @@
+bugfixes:
+  - Fix incorrect "Could not match supplied host pattern" warning (https://github.com/ansible/ansible/issues/66764)
diff --git a/lib/ansible/playbook/play.py b/lib/ansible/playbook/play.py
index f84fff09e57..35dfc558c8e 100644
--- a/lib/ansible/playbook/play.py
+++ b/lib/ansible/playbook/play.py
@@ -53,7 +53,7 @@ class Play(Base, Taggable, CollectionSearch):
     """
 
     # =================================================================================
-    _hosts = FieldAttribute(isa='list', required=True, listof=string_types, always_post_validate=True)
+    _hosts = FieldAttribute(isa='list', required=True, listof=string_types, always_post_validate=True, priority=-1)
 
     # Facts
     _gather_facts = FieldAttribute(isa='bool', default=None, always_post_validate=True)
diff --git a/test/integration/targets/include_import/empty_group_warning/playbook.yml b/test/integration/targets/include_import/empty_group_warning/playbook.yml
new file mode 100644
index 00000000000..6da5b7c3f53
--- /dev/null
+++ b/test/integration/targets/include_import/empty_group_warning/playbook.yml
@@ -0,0 +1,13 @@
+---
+- hosts: localhost
+  gather_facts: false
+  tasks:
+    - name: Group
+      group_by:
+        key: test_{{ inventory_hostname }}
+
+- hosts: test_localhost
+  gather_facts: false
+  tasks:
+    - name: Print
+      import_tasks: tasks.yml
diff --git a/test/integration/targets/include_import/empty_group_warning/tasks.yml b/test/integration/targets/include_import/empty_group_warning/tasks.yml
new file mode 100644
index 00000000000..2fbad77337c
--- /dev/null
+++ b/test/integration/targets/include_import/empty_group_warning/tasks.yml
@@ -0,0 +1,3 @@
+- name: test
+  debug:
+    msg: hello
diff --git a/test/integration/targets/include_import/runme.sh b/test/integration/targets/include_import/runme.sh
index 199cd472bc3..f72a6ebaddc 100755
--- a/test/integration/targets/include_import/runme.sh
+++ b/test/integration/targets/include_import/runme.sh
@@ -108,3 +108,6 @@ ansible-playbook valid_include_keywords/playbook.yml "$@"
 # https://github.com/ansible/ansible/issues/64902
 ansible-playbook tasks/test_allow_single_role_dup.yml 2>&1 | tee test_allow_single_role_dup.out
 test "$(grep -c 'ok=3' test_allow_single_role_dup.out)" = 1
+
+# https://github.com/ansible/ansible/issues/66764
+ANSIBLE_HOST_PATTERN_MISMATCH=error ansible-playbook empty_group_warning/playbook.yml