[puzzledobserver]

The Indian Supreme Court introduced the Basic Structure Doctrine in 1970, allowing the judiciary to overrule constitutional amendments if they are found to contradict the "basic structure" of the constitution.

It's original purpose, if I understand correctly, was to guarantee that fundamental rights were an essential part of the constitution and couldn't be amended away.

Wikipedia says that multiple countries appear to have adopted the principle: Pakistan, India, Bangladesh and Uganda.