add deprecation warnings for using markinfo attributes

_pytest/deprecated.py

@@ -7,6 +7,11 @@ be removed when the time comes.
 """
 from __future__ import absolute_import, division, print_function
 
+
+class RemovedInPytest4_0Warning(DeprecationWarning):
+    "warning class for features removed in pytest 4.0"
+
+
 MAIN_STR_ARGS = 'passing a string to pytest.main() is deprecated, ' \
                       'pass a list of arguments instead.'
 
@@ -22,3 +27,6 @@ SETUP_CFG_PYTEST = '[pytest] section in setup.cfg files is deprecated, use [tool
 GETFUNCARGVALUE = "use of getfuncargvalue is deprecated, use getfixturevalue"
 
 RESULT_LOG = '--result-log is deprecated and scheduled for removal in pytest 4.0'
+
+MARK_INFO_ATTRIBUTE = RemovedInPytest4_0Warning(
+    "Markinfo attributes are deprecated, please iterate the mark Collection")