Different type syntax

[lue-bird]

Single constructor union types feel error-prone for beginners. One example:

type Model = List { url : String }

initialModel : Model
initialModel =
    [ { url = "1.jpeg" } ]

type List { url : String } doesn't match Model

Adding | before the first variant makes the variants more obvious and explicit:

type WrongModel =
    | List { url : String }

type alias CorrectModel =
    List { url : String }

• type Model = List { url : String }
  

  would produce a nice error message, as the compiler knows that you want an alias there.
• = placement becomes consistent with all no-type constructs

Dropping type and type alias would make it even cleaner:

Point =
    { x : Float, y : Float }

Fruit =
   | Pear
   | Banana { angle : Float }

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