github/semantic
1
1
Fork 0
mirror of https://github.com/github/semantic.git synced 2024-12-23 14:54:16 +03:00
Code Issues Projects Releases Wiki Activity

Define an Eq1 instance for empty unions.

Browse Source 
These can never be constructed, so we just return False in case somebody decides to apply this to bottom.
This commit is contained in:
Rob Rix 2017-04-06 11:19:57 -04:00
parent 349214b5c5
commit 3d1feb70a4
1 changed files with 3 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
src/Data/Functor/Union.hs
View File

@ -65,3 +65,6 @@ instance (Eq1 f, Eq1 (Union fs)) => Eq1 (Union (f ': fs)) where
liftEq eq (Here f) (Here g) = liftEq eq f g
liftEq eq (There f) (There g) = liftEq eq f g
liftEq _ _ _ = False
instance Eq1 (Union '[]) where
liftEq _ _ _ = False -- We can never get here anyway.