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The "check" name is a reserved word used by Django's check framework, and cannot be redefined as something else other than a method, or the check framework will raise an error. This change amends the django.core.checks.model_check.check_all_models() function, so that it verifies that a model instance's attribute "check" is actually a method. This new check is assigned the id "models.E020". Conflicts: docs/ref/checks.txt Backport of a5c77417a6 from master