1. 03 Mar, 2019 1 commit
    • Robbert Krebbers's avatar
      Overhaul of the `Infinite`/`Fresh` infrastructure. · 3184ef61
      Robbert Krebbers authored
      - The class `Infinite A` is now defined as having a function
        `fresh : list A → A`, that given a list `xs`, gives an element `x ∉ xs`.
      - For most types this `fresh` function has a sensible computable behavior,
        for example:
        + For numbers, it yields one added to the maximal element in `xs`.
        + For strings, it yields the first string representation of a number that is
          not in `xs`.
      - For any type `C` of finite sets with elements of infinite type `A`, we lift
        the fresh function to `C → A`.
      As a consequence:
      - It is now possible to pick fresh elements from _any_ finite set and from
        _any_ list with elements of an infinite type. Before it was only possible
        for specific finite sets, e.g. `gset`, `pset`, ...
      - It makes the code more uniform. There was a lot of overlap between having a
        `Fresh` and an `Infinite` instance. This got unified.
  2. 01 Mar, 2019 4 commits
  3. 28 Feb, 2019 2 commits
  4. 23 Feb, 2019 4 commits
  5. 22 Feb, 2019 1 commit
  6. 21 Feb, 2019 10 commits
  7. 20 Feb, 2019 18 commits