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| author | Greg Brown <greg.brown01@ed.ac.uk> | 2023-07-10 13:37:56 +0100 |
|---|---|---|
| committer | Greg Brown <greg.brown01@ed.ac.uk> | 2023-07-10 13:37:56 +0100 |
| commit | ce546fe96974cb7aa3b09c729f33ac6ba5169299 (patch) | |
| tree | d58a1a217c54ae07aefb1f6b5c886e64c6b051db /src/Data/Maybe | |
| parent | 849b99d0a51674a15acfdfe4b6f6606491b20166 (diff) | |
Describe unification.
Diffstat (limited to 'src/Data/Maybe')
| -rw-r--r-- | src/Data/Maybe/Properties.idr | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/src/Data/Maybe/Properties.idr b/src/Data/Maybe/Properties.idr index 99a3507..459cb8f 100644 --- a/src/Data/Maybe/Properties.idr +++ b/src/Data/Maybe/Properties.idr @@ -20,6 +20,11 @@ extractIsJust ItIsJust = (_ ** Refl) %inline export +extractIsNothing : {x : Maybe a} -> (0 _ : IsNothing x) -> x = Nothing +extractIsNothing ItIsNothing = Refl + +%inline +export mapIsJust : (0 f : a -> b) -> IsJust x -> IsJust (map f x) mapIsJust f ItIsJust = ItIsJust |