def METHOD_NAME(x):
    r"""
    Return True if x is of type HeckeModuleMorphism.
    EXAMPLES::
        sage: sage.modular.hecke.morphism.is_HeckeModuleMorphism(ModularSymbols(6).hecke_operator(7).hecke_module_morphism())
        True
    """
    return isinstance(x, HeckeModuleMorphism)