FlowExpressions.java

import org.checkerframework.checker.lock.qual.*;
import org.checkerframework.dataflow.qual.Pure;

class FlowExpressions {
    class MyClass {
        public Object field;
    }

    private final @GuardedBy({"<self>"}) MyClass m = new MyClass();
    // private @GuardedBy({"nonexistentfield"}) MyClass m2;
    @Pure
    private @GuardedBy({"<self>"}) MyClass getm() {
        return m;
    }

    public void method() {
        //:: error: (lock.not.held)
        getm().field = new Object();
        //:: error: (lock.not.held)
        m.field = new Object();
        // TODO: fix the Lock Checker code so that a flowexpr.parse.error is issued (due to the guard of "nonexistentfield" on m2)
        // m2.field = new Object();
        synchronized (m) {
            m.field = new Object();
        }
        synchronized (getm()) {
            getm().field = new Object();
        }
    }
}