@RequiresDetToString cannot specify that the receiver must have deterministic toString

[t-rasmud]

Consider the test case below:

import org.checkerframework.checker.determinism.qual.NonDet;
import org.checkerframework.checker.determinism.qual.PolyDet;
import org.checkerframework.checker.determinism.qual.RequiresDetToString;

public class RequiresDetToStringThis {

    public void testPositional() {
        receiverRequired();
    }

    @RequiresDetToString(0)
    public void receiverRequired() {}

    @Override
    public @NonDet String toString(@PolyDet RequiresDetToStringThis this) {
        return this.toString();
    }
}

The method receiverRequired is annotated with @RequiresDetToString(0) which should ideally mean that the receiver
must have a deterministic toString(). In the above code, the class RequiresDetToStringThis has an implementation of toString() that returns @NonDet. Therefore, the above code shouldn't type check.
However, running the command javac -processor determinism checker/tests/determinism/RequiresDetToStringThis.java doesn't report any warning.
It appears that the current implementation of @RequiresDetToString incorrectly uses 0-based indexing for formal parameters and doesn't consider the receiver in its checking.