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2.0 KiB
2.0 KiB
Propagating type edits
scratch/main> builtins.merge lib.builtins
We introduce a type Foo
with a function dependent fooToInt
.
unique type Foo = Foo
fooToInt : Foo -> Int
fooToInt _ = +42
And then we add it.
scratch/main> add
scratch/main> find.verbose
scratch/main> view fooToInt
Then if we change the type Foo
...
unique type Foo = Foo | Bar
and update the codebase to use the new type Foo
...
scratch/main> update.old
... it should automatically propagate the type to fooToInt
.
scratch/main> view fooToInt
Preserving user type variables
We make a term that has a dependency on another term and also a non-redundant user-provided type signature.
preserve.someTerm : Optional foo -> Optional foo
preserve.someTerm x = x
preserve.otherTerm : Optional baz -> Optional baz
preserve.otherTerm y = someTerm y
Add that to the codebase:
scratch/main> add
Let's now edit the dependency:
preserve.someTerm : Optional x -> Optional x
preserve.someTerm _ = None
Update...
scratch/main> update.old
Now the type of someTerm
should be Optional x -> Optional x
and the
type of otherTerm
should remain the same.
scratch/main> view preserve.someTerm
scratch/main> view preserve.otherTerm
Propagation only applies to the local branch
Cleaning up a bit...
.subpath.lib> builtins.merge
Now, we make two terms, where one depends on the other.
one.someTerm : Optional foo -> Optional foo
one.someTerm x = x
one.otherTerm : Optional baz -> Optional baz
one.otherTerm y = someTerm y
We'll make two copies of this namespace.
.subpath> add
.subpath> fork one two
Now let's edit one of the terms...
someTerm : Optional x -> Optional x
someTerm _ = None
... in one of the namespaces...
.subpath.one> update.old
The other namespace should be left alone.
.subpath> view two.someTerm