Verified Commit bb75eecc authored by Tej Chajed's avatar Tej Chajed
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Add Countable instance for Ascii.ascii

parent 9b75ffdf
......@@ -11,6 +11,7 @@ API-breaking change is listed.
exported by the prelude. This is a breaking change if one only
imports `list.v`, but not the prelude.
- Rename `drop_insert` into `drop_insert_gt` and add `drop_insert_le`.
- Added `Countable` instance for `Ascii.ascii`.
## std++ 1.3 (released 2020-03-18)
......@@ -115,3 +115,7 @@ Program Instance string_countable : Countable string := {|
encode := string_to_pos; decode p := Some (string_of_pos p)
Solve Obligations with naive_solver eauto using string_of_to_pos with f_equal.
Lemma ascii_of_to_digits a : ascii_of_digits (ascii_to_digits a) = a.
Proof. by destruct a as [[][][][][][][][]]. Qed.
Instance ascii_countable : Countable ascii :=
inj_countable' ascii_to_digits ascii_of_digits ascii_of_to_digits.
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