E3024

Legacy constructor functions declared inside a struct must have name new.

当在 struct 内声明的构造函数没有命名为 new 时，会发生此错误。MoonBit 将 new 视为该结构体的构造入口。

错误示例

pub struct S {
  x : Int
  fn constr(x : Int) -> S
}

fn S::constr(x : Int) -> S {
  { x, }
}

建议

Define the constructor with the current top-level Type::Type form:

pub struct S {
  x : Int
}

fn S::S(x : Int) -> S {
  { x, }
}

pub fn make(x : Int) -> S {
  S(x)
}