reserved vars, avoid gather_subset (#84575)

lib/ansible/vars/manager.py

@@ -559,8 +559,7 @@ class VariableManager:
         if not isinstance(facts, Mapping):
             raise AnsibleAssertionError("the type of 'facts' to set for host_facts should be a Mapping but is a %s" % type(facts))
 
-        # NOTE: will ignore gather_subset until we can deprecate/remove this as a return from setup.py
-        warn_if_reserved(facts.keys(), ignores=['gather_subset'])
+        warn_if_reserved(facts.keys())
         try:
             host_cache = self._fact_cache[host]
         except KeyError:
@@ -584,8 +583,7 @@ class VariableManager:
         if not isinstance(facts, Mapping):
             raise AnsibleAssertionError("the type of 'facts' to set for nonpersistent_facts should be a Mapping but is a %s" % type(facts))
 
-        # NOTE: will ignore gather_subset until we can deprecate/remove this as a return from setup.py
-        warn_if_reserved(facts.keys(), ignores=['gather_subset'])
+        warn_if_reserved(facts.keys())
         try:
             self._nonpersistent_fact_cache[host] |= facts
         except KeyError:

lib/ansible/vars/reserved.py

@@ -60,10 +60,14 @@ def get_reserved_names(include_private: bool = True) -> set[str]:
     else:
         result = public
 
+    # due to Collectors always adding, need to ignore this
+    # eventually should remove after we deprecate it in setup.py
+    result.remove('gather_subset')
+
     return result
 
 
-def warn_if_reserved(myvars: list[str], additional: list[str] | None = None, ignores: list[str] | None = None) -> None:
+def warn_if_reserved(myvars: list[str], additional: list[str] | None = None) -> None:
     """ this function warns if any variable passed conflicts with internally reserved names """
 
     if additional is None:
@@ -71,13 +75,9 @@ def warn_if_reserved(myvars: list[str], additional: list[str] | None = None, ign
     else:
         reserved = _RESERVED_NAMES.union(additional)
 
-    if ignores is None:
-        ignores = []
-
     varnames = set(myvars)
     varnames.discard('vars')  # we add this one internally, so safe to ignore
     for varname in varnames.intersection(reserved):
-        if varname not in ignores:
         display.warning('Found variable using reserved name: %s' % varname)