• Robbert Krebbers's avatar
    New definition of contractive. · 176a588c
    Robbert Krebbers authored
    Using this new definition we can express being contractive using a
    Proper. This has the following advantages:
    - It makes it easier to state that a function with multiple arguments
      is contractive (in all or some arguments).
    - A solve_contractive tactic can be implemented by extending the
      solve_proper tactic.