nmodule.mmodule = null # invalidate the module
end
if sup.in_importation < mmodule then
error(aimport.n_name, "Error: dependency loop between modules {mmodule} and {sup}.")
nmodule.mmodule = null # invalidate the module
end
if sup.in_importation < mmodule then
error(aimport.n_name, "Error: dependency loop between modules {mmodule} and {sup}.")