mirror of
https://github.com/idris-lang/Idris2.git
synced 2024-12-13 17:25:29 +03:00
26 lines
544 B
Idris
26 lines
544 B
Idris
|
data A : Type where
|
||
|
|
The : Type -> A
|
||
|
|
|
||
|
|
U : A -> Type
|
||
|
|
U (The x) = x
|
||
|
|
|
||
|
|
works : (a : A) -> (H : U a) -> (let q = H in Nat)
|
||
|
|
works a h = 0
|
||
|
|
|
||
|
|
fails : (a : A) -> (H : U a) -> (let q : U a = H in Nat)
|
||
|
|
fails a h = 0
|
||
|
|
|
||
|
|
dolet : Maybe Int -> Maybe Int -> Maybe Int
|
||
|
|
dolet x y
|
||
|
|
= do let Just x' : Maybe Int = x
|
||
|
|
| Nothing => Nothing
|
||
|
|
y' <- y
|
||
|
|
pure (x' + y')
|
||
|
|
|
||
|
|
dolet2 : Maybe Int -> Maybe Int -> Maybe Int
|
||
|
|
dolet2 x y
|
||
|
|
= do let Just x' : Maybe String = x
|
||
|
|
| Nothing => Nothing
|
||
|
|
y' <- y
|
||
|
|
pure (x' + y')
|