EmptyConstructor.java

// @skip-test Change error key to one with a clearer message that explicitly mentions the superclass constructor

import org.checkerframework.dataflow.qual.*;

class SuperClass {
    static int count = 0;

    public SuperClass() {
        count++;
    }
}

// The error message is very confusing:
//   EmptyConstructor.java:22: error: call to non-side-effect-free method not allowed in side-effect-free method
//     public EmptyConstructor() { }
//                               ^
// because there's no obvious call.  The message key should be changed to
// one whose message is "call to non-side-effect-free superclass
// constructor not allowed in side-effect-free constructor"

public class EmptyConstructor extends SuperClass {
    @SideEffectFree
    public EmptyConstructor() {}
}