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use data Array

structural type Sequence a
  = Empty Nat
  | Sequence Nat Nat (Array a) (Sequence (Array a)) (Array a)

Sequence.arity : Sequence a -> Nat
Sequence.arity = cases
  Sequence.Empty arity   -> arity
  Sequence arity _ _ _ _ -> arity

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unique type test.Result = Fail Failure | Ok Text

unique ability Weighted a where
  bump : Nat -> ()
  give : a -> ()

unique ability Gen where
  generate : '{Weighted a} () -> a

Weighted.map : (a ->{g} b) -> '{Weighted a, g} r -> '{Weighted b,g} r 

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Here's a transcript of me updating a dependency in Unison. We're going to make this more streamlined, but this is the process for now. First, I made a copy of the branch I was updating (in this case main of distributed):

.distributed> fork main topics.baseupdate

  Done.

Next I pulled the new version of base into lib.base_new:

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-- id is the doc id, a is the text type, v is the value type
unique type Trie id txt
  = Remainder txt (Trie.Pos id)
  | Branch Nat (Dataset Value (Trie.Pos id)) (Map txt (Value (Trie id txt)))
  --Remainder id txt Nat
  -- there can be multiple docs at this suffix
  -- Branch size 
  --| Branch Nat (Dataset Value id) (Map txt (Value (Trie id txt)))

unique type Trie.Pos id = Pos id Nat

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{{
  ``List.selectBy o k as`` yields the same results as ``List.at k sorted`` 
  where ''sorted'' is a sorted version of ''as'', but in (expected) linear time
  without fully sorting the list.

  ```
  List.selectBy Universal.ordering 2 [4,1,3,2,5]
  ```

  ```

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{{ 
  ``task.pure a`` creates a task that returns ''a'' on {Remote.await}. 

  That is, {{docExample 1 '(a -> Remote.await (task.pure a) === a) }}
}}
Remote.task.pure : a -> t a
Remote.task.pure a = 
  t = Remote.empty! 
  task.complete (Right a)
  t

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structural ability Split where
  skip! : x
  both : a -> a -> a

Split! : [a] ->{Split} a
Split! = cases
  [] -> skip!
  [a] -> a
  as ->
    (l,r) = halve as

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> Async.pure.run 'let
  List.parMap (x -> x*10) [1,2,3,4,5] 

> Async.pure.run 'let
  use Async put fork await empty!
  tr = empty!
  t1 = fork '(await tr + 1)
  t2 = fork '(put 9 tr)
  Async.await t1

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unique ability Located d where
  location : d a -> Location {} 

unique ability Storage.Distributed d where
  restore : d a -> a
  save : a -> d a
  saveNear : d x -> a -> d a

unique type Kit d m a
  = Empty

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# I version my full namespace tree here, it's a snapshot
# of all my current workstreams. If I need to switch
# computers, I might just push here, then pull on the
# other computer.
# `.> push` will go here.
GitUrl = "git@github.com:pchiusano/unisoncode"

# GitUrl {
# 
#   # Some projects I occasionally make PRs against.