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Idris2-boot/tests/ttimp/dot001/Dot4.yaff

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Implement dot patterns Like Idris 1, these are implicitly added on encountering a repeated name or a non-constructor application. Unlike Idris 1 (and Blodwen) they are checking by unification rather than matching (which means in particular that function argument names can't be bound in dot patterns) which is slightly less expressive, but better overall because matching is potentially more error prone.
2019-05-25 20:39:21 +03:00
data Nat : Type where
Z : Nat
S : Nat -> Nat
plus : Nat -> Nat -> Nat
plus Z $y = y
plus (S $k) $y = S (plus k y)
data Baz : Nat -> Type where
AddThings : (x : Nat) -> (y : Nat) -> Baz (plus x y)
addBaz : (x : Nat) -> Baz x -> Nat
Improve dot patterns Allow matching rather than unification, as long as it doesn't solve any metavariables on the way. I noticed a potential unification bug on the way, forgetting to update whether holes are solved when unifying argument lists.
2019-07-05 01:16:08 +03:00
addBaz (plus x y) (AddThings _ _) = plus x y
Implement dot patterns Like Idris 1, these are implicitly added on encountering a repeated name or a non-constructor application. Unlike Idris 1 (and Blodwen) they are checking by unification rather than matching (which means in particular that function argument names can't be bound in dot patterns) which is slightly less expressive, but better overall because matching is potentially more error prone.
2019-05-25 20:39:21 +03:00
Improve dot patterns Allow matching rather than unification, as long as it doesn't solve any metavariables on the way. I noticed a potential unification bug on the way, forgetting to update whether holes are solved when unifying argument lists.
2019-07-05 01:16:08 +03:00
-- Can't unify because of the repeated argument
Implement dot patterns Like Idris 1, these are implicitly added on encountering a repeated name or a non-constructor application. Unlike Idris 1 (and Blodwen) they are checking by unification rather than matching (which means in particular that function argument names can't be bound in dot patterns) which is slightly less expressive, but better overall because matching is potentially more error prone.
2019-05-25 20:39:21 +03:00
addBaz4 : (x : Nat) -> Baz x -> Nat
Improve dot patterns Allow matching rather than unification, as long as it doesn't solve any metavariables on the way. I noticed a potential unification bug on the way, forgetting to update whether holes are solved when unifying argument lists.
2019-07-05 01:16:08 +03:00
addBaz4 (plus _ _) (AddThings x x) = plus x x
Implement dot patterns Like Idris 1, these are implicitly added on encountering a repeated name or a non-constructor application. Unlike Idris 1 (and Blodwen) they are checking by unification rather than matching (which means in particular that function argument names can't be bound in dot patterns) which is slightly less expressive, but better overall because matching is potentially more error prone.
2019-05-25 20:39:21 +03:00
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