unnecessary_const_in_enum_constructor

Unnecessary 'const' keyword in an enum constructor.

The analyzer produces this diagnostic when the keyword const is used in a generative enum constructor. Generative enum constructors are implicitly const.

The following code produces this diagnostic because the keyword const in the enum's primary constructor isn't needed:

enum const E(final int i) {
  a(1),
  b(2);
}

The following code produces this diagnostic because the keyword const in the enum's in-body constructor isn't needed:

enum E {
  a(1),
  b(2);
​
  const E(this.i);
​
  final int i;
}

Remove the unnecessary keyword:

enum E(final int i) {
  a(1),
  b(2);
}

enum E {
  a(1),
  b(2);
​
  new(this.i);
​
  final int i;
}