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.> builtins.merge
This transcript checks that updates to data types propagate successfully to dependent types and dependent terms that do pattern matching. First let's create some types and terms:
unique type A a b c d
= A a
| B b
| C c
| D d
structural type NeedsA a b = NeedsA (A a b Nat Nat)
| Zoink Text
f : A Nat Nat Nat Nat -> Nat
f = cases
A n -> n
_ -> 42
f2 a =
n = f a
n + 1
f3 : NeedsA Nat Nat -> Nat
f3 = cases
NeedsA a -> f a + 20
_ -> 0
g : A Nat Nat Nat Nat -> Nat
g = cases
D n -> n
_ -> 43
We'll make our edits in a fork of the a
namespace:
.a> add
.> fork a a2
First let's edit the A
type, adding another constructor E
. Note that the functions written against the old type have a wildcard in their pattern match, so they should work fine after the update.
unique type A a b c d
= A a
| B b
| C c
| D d
| E a d
Let's do the update now, and verify that the definitions all look good and there's nothing todo
:
.a2> update
.a2> view A NeedsA f f2 f3 g
.a2> todo
Record updates
Here's a test of updating a record:
structural type Rec = { uno : Nat, dos : Nat }
combine r = uno r + dos r
.a3> add
structural type Rec = { uno : Nat, dos : Nat, tres : Text }
And checking that after updating this record, there's nothing todo
:
.> fork a3 a4
.a4> update
.a4> todo