Kind2/CHANGELOG.md

Kind 1.0.112

• Replace syntax is like rewrite, but equality is reversed

  replace x with e in goal

  This replaces the right side of the equality by the left side in the goal This should be more robust since it doesn't need to use mirror and, thus, avoids some holes

Kind 1.0.108

• Allow "for" to be on the left side of a list comprehension

  [for x in [0 to 10] where Nat.is_even(x): x * 2]

Kind 1.0.104

• Implicit arguments are here!

  id<A: $Type>(x: A): A
    x
  
  explicit: Nat
    id<$Nat>(7)
  
  implicit: Nat
    id(7)
  

• Nullary function call can be used instead of !

  let a = Map.new!
  let b = Map.new()
  

  This is helpful, because implicit arguments only trigger on calls.

Kind 1.0.101

• Mutter syntax and improvements on the getter/setter syntax.

  Now you can get/set deeply nested fields. For example, list[0][0] works and returns a Maybe, and list[0][0] <- 7 works as expected. Moreover, the <= syntax can now be used to apply a function to the focused field. Example:

  type Bar {
    new(map: Map<List<List<Nat>>>)
  }
  
  type Foo {
    new(bar: Bar)
  }
  
  Test: Maybe<Nat>
    // Creates a value
    let a = Foo.new(Bar.new({"list": [[1,2,3],[4,5,6],[7,8,9]]}))
  
    // Applies a function to a nested element
    let a = a@bar@map{"list"}[0][0] <= Nat.mul(10)
  
    // Gets a nested element
    a@bar@map{"list"}[0][0]
  

Kind 1.0.91

• Forall now demands ->

• Now you can assign types in lambda parameters as in

  Test: _
    (x: Nat, y) x + y
  

Kind 1.0.85

• Optimize BBT.for

Kind 1.0.81

• Add Scheme compilation options to CLI

Kind 1.0.79

• Socket UDP primitives

  Check Example.udp.sender and Example.udp.receiver

Kind 1.0.75

• New syntaxes

  • Use

    use x = obj rest

    // Equivalent to:

    let x = obj open x rest

  • Let abort

    let x = maybe abort k rest

    // Equivalent to:

    case maybe as x { none: k some: let x = x.value rest }

    // Also works with 'use'

  • List comprehension

    [x * 10 for x in [1, 2, 3]]

    // Returns:

    [10, 20, 30]

  • Map for-in:

    for key:val in map with state: loop rest

    let state = for key:val in map: loop rest

  • Function composition:

    f . g

    // Equivalent to:

    Function.comp!!!(f, g)

Kind 1.0.64

• Monadic block improvements

  • Now it accepts most outside notations (let, open, log, for, etc.)

  • When you use a "for" without a "with", it becomes a monadic loop:

    IO { for i from 0 to 10: IO.print(Nat.show(i)) for i from 100 to 110: IO.print(Nat.show(i)) }

Kind 1.0.63

• Generic derivers: stringifier, parser, serializer, deserializer. Example:

  type MyType {
    foo(n: List<Nat>, s: String, m: MyType)
    bar
  } deriving (stringifier, parser, serializer, deserializer)
  
  Test: _
    IO {
      let val = MyType.foo([1,2,3], "Hello", MyType.bar)
  
      // Converts to string
      let str = Stringifier.run!(MyType.stringifier, val)
      IO.print("str: " | str)
  
      // Parses string to a value
      let val = Parser.run!(MyType.parser, str) <> MyType.bar
  
      // Serializes to bits
      let bts = Serializer.run!(MyType.serializer, val)
      IO.print("bts: " | Bits.show(bts))
  
      // Deserializes to a value
      let val = Deserializer.run!(MyType.deserializer, bts) <> MyType.bar
  
      // Converts to string again
      let str = Stringifier.run!(MyType.stringifier, val)
      IO.print("str: " | str)
    }
  

Kind 1.0.51

• Inference on numeric literals and binary operators. Check SYNTAX.md.

• Many bugfixes

Kind 1.0.46

• New syntax to create, get and set attributes of records

type Foo {
  new(x: Nat, y: Nat)
}

Test: _
  let foo = {1,2}       // same as `Foo.new(1,2)`
  let x   = foo@x       // same as `case foo { new: foo.x }`
  let bar = foo@y <- 80 // same as `case foo { new: Foo.new(80,foo.y) }`
  bar