Drop the "alias" helper used in MarkDecorator

It is a little too obscure IMO, but the reason I want to drop it is that
type checking has no hope of understanding such dynamic constructs.

The warning argument wasn't used.

src/_pytest/mark/structures.py

@@ -2,7 +2,6 @@ import inspect
 import warnings
 from collections import namedtuple
 from collections.abc import MutableMapping
-from operator import attrgetter
 from typing import Set
 
 import attr
@@ -17,16 +16,6 @@ from _pytest.warning_types import PytestUnknownMarkWarning
 EMPTY_PARAMETERSET_OPTION = "empty_parameter_set_mark"
 
 
-def alias(name, warning=None):
-    getter = attrgetter(name)
-
-    def warned(self):
-        warnings.warn(warning, stacklevel=2)
-        return getter(self)
-
-    return property(getter if warning is None else warned, doc="alias for " + name)
-
-
 def istestfunc(func):
     return (
         hasattr(func, "__call__")
@@ -205,9 +194,20 @@ class MarkDecorator:
 
     mark = attr.ib(validator=attr.validators.instance_of(Mark))
 
-    name = alias("mark.name")
-    args = alias("mark.args")
-    kwargs = alias("mark.kwargs")
+    @property
+    def name(self):
+        """alias for mark.name"""
+        return self.mark.name
+
+    @property
+    def args(self):
+        """alias for mark.args"""
+        return self.mark.args
+
+    @property
+    def kwargs(self):
+        """alias for mark.kwargs"""
+        return self.mark.kwargs
 
     @property
     def markname(self):

testing/test_mark.py

@@ -831,6 +831,12 @@ class TestMarkDecorator:
     def test__eq__(self, lhs, rhs, expected):
         assert (lhs == rhs) == expected
 
+    def test_aliases(self) -> None:
+        md = pytest.mark.foo(1, "2", three=3)
+        assert md.name == "foo"
+        assert md.args == (1, "2")
+        assert md.kwargs == {"three": 3}
+
 
 @pytest.mark.parametrize("mark", [None, "", "skip", "xfail"])
 def test_parameterset_for_parametrize_marks(testdir, mark):