S2259: Reset constraints on calls in static methods

[martin-strecker-sonarsource]

Same as calls with a this receiver (aka instance methods) reset field constraints, calls to static methods should also reset field constraints:

public class C
{
  static object field;
  static void M()
  {
    field = null; // learn about field
    OtherStaticMethod();
    field.ToString(); // Compliant
  }
}

[pavel-mikula-sonarsource]

These should reset static fields only. Static method cannot change instance fields