id: no-singledispatch-on-method
valid:
  - |
    from functools import singledispatch

    @singledispatch
    def process(value):
        return value
  - |
    from functools import singledispatchmethod

    class Foo:
        @singledispatchmethod
        @classmethod
        def process(cls, value):
            return value
invalid:
  - |
    from functools import singledispatch

    class Foo:
        @singledispatch
        @classmethod
        def process(cls, value):
            return value