E4198

Compiler diagnostic name: struct_constr_not_implemented.

When a struct declares a constructor signature, that constructor must be implemented as the corresponding Type::new method. The declaration only gives the constructor signature; it does not create the implementation body.

Erroneous example

///|
priv struct Point {
  x : Int

  fn new(Int) -> Point
}

Suggestion

Define the matching Type::new method.

///|
priv struct Point {
  x : Int

  fn new(Int) -> Point
}

///|
fn Point::new(x : Int) -> Point {
  { x, }
}

///|
test {
  let point = Point(4)
  inspect(point.x, content="4")
}