[simonh]

We have this principle here in the UK as well. No parliament can ever be constrained in it's actions by any previous parliament.

This came up in the Brexit controversies when the government tried to mandate an exit date as being immutable by future legislation, but the Speaker wouldn't have it. In that case some Brexiteers cried foul that it was overreach by the Speaker, but of course such a weapon could equally be used to make our membership of the EU irrevocable. It's a sound principle.