Monotonic.java

import org.checkerframework.framework.test.*;
import testlib.util.*;

class Monotonic {

    String f1;
    @MonotonicOdd String f2;
    @MonotonicOdd String f2b;
    @Odd String f3;
    Monotonic[] ms;

    void nonpure() {}

    void t1(@Odd String p1) {
        //:: error: (assignment.type.incompatible)
        @Odd String l1 = f2;
        if (f2 == p1) {
            @Odd String l2 = f2;
            nonpure();
            @Odd String l3 = f2;
        }
    }

    void t2(@Odd String p1) {
        //:: error: (assignment.type.incompatible)
        f2 = f1;
        //:: error: (monotonic.type.incompatible)
        f2 = f2b; // assigning @MonotonicOdd to @MonotonicOdd is not allowed
    }

    void t3(@Odd String p1) {
        //:: error: (assignment.type.incompatible)
        @Odd String l1 = f2;
        f2 = p1;
        @Odd String l2 = f2;
        nonpure();
        @Odd String l3 = f2;
    }

    void t4(@Odd String p1) {
        //:: error: (assignment.type.incompatible)
        @Odd String l1 = f2;
        f2 = p1;
        @Odd String l2 = f2;
        ms[0].f2 = p1;
        @Odd String l3 = f2;
    }
}