Remove vars attribute from base

Fixes #11779

lib/ansible/playbook/base.py

@@ -47,8 +47,7 @@ class Base:
     _port                = FieldAttribute(isa='int')
     _remote_user         = FieldAttribute(isa='string')
 
-    # vars and flags
-    _vars                = FieldAttribute(isa='dict', default=dict())
+    # flags and misc. settings
     _environment         = FieldAttribute(isa='list', default=[])
     _no_log              = FieldAttribute(isa='bool', default=False)
 

lib/ansible/playbook/block.py

@@ -62,7 +62,6 @@ class Block(Base, Become, Conditional, Taggable):
         if self._task_include:
             all_vars.update(self._task_include.get_vars())
 
-        all_vars.update(self.vars)
         return all_vars
 
     @staticmethod

lib/ansible/playbook/play.py

@@ -64,6 +64,7 @@ class Play(Base, Taggable, Become):
     _name                = FieldAttribute(isa='string', default='')
 
     # Variable Attributes
+    _vars                = FieldAttribute(isa='dict', default=dict())
     _vars_files          = FieldAttribute(isa='list', default=[])
     _vars_prompt         = FieldAttribute(isa='list', default=[])
     _vault_password      = FieldAttribute(isa='string')

lib/ansible/playbook/task.py

@@ -91,6 +91,7 @@ class Task(Base, Conditional, Taggable, Become):
         self._block        = block
         self._role         = role
         self._task_include = task_include
+        self._vars         = dict()
 
         super(Task, self).__init__()
 
@@ -193,7 +194,7 @@ class Task(Base, Conditional, Taggable, Become):
         super(Task, self).post_validate(templar)
 
     def get_vars(self):
-        all_vars = self.vars.copy()
+        all_vars = self._vars.copy()
         if self._block:
             all_vars.update(self._block.get_vars())
         if self._task_include: