Arguments of a constant creation must be constant expressionsDRT-W1279

The analyzer produces this diagnostic when a const constructor is invoked with an argument that isn't a constant expression.

Example

The following code produces this diagnostic because i isn't a constant:

class C {
  final int i;
  const C(this.i);
}
C f(int i) => const C(i);

Common fixes

Either make all of the arguments constant expressions, or remove the const keyword to use the non-constant form of the constructor:

class C {
  final int i;
  const C(this.i);
}
C f(int i) => C(i);