Shows an issue with CMake() not being initializable from within the ctor. conan-io/conan issue #4437

conanfile.py

from CustomConanFile import CustomConanFile

class SpecificConan(CustomConanFile):
    name = "Hello"
    version = "0.1"
    settings = "os", "compiler", "build_type", "arch"
    
    def build(self):
        print(str(self.cmake))

CustomConanFile.py

from conans import ConanFile, CMake

class CustomConanFile(ConanFile):
    #new ctor (after 1.3.0)
    def __init__(self, output, runner, display_name="", user=None, channel=None):
        super(CustomConanFile, self).__init__(output, runner)
        self.cmake = CMake(self)
        #...some more stuff here...