E4197

编译器诊断名称：cannot_match_struct_constr。

A struct constructor is a function, not a pattern constructor. It can be called to create a value, but it cannot be used in a match pattern.

错误示例

///|
priv struct Point {
  x : Int
}

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

///|
fn read(point : Point) -> Int {
  match point {
    Point(x) => x
  }
}

///|
test {
  let _ = read(Point(1))
}

建议

直接读取结构体字段，或使用另一种不会调用构造函数的模式。

///|
priv struct Point {
  x : Int
}

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

///|
fn read(point : Point) -> Int {
  point.x
}

///|
test {
  inspect(read(Point(3)), content="3")
}