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import org.checkerframework.checker.initialization.qual.*;
import org.checkerframework.checker.nullness.qual.*;
class OverrideANNA2 {
static class Super {
Object f;
@EnsuresNonNull("f") // Super.f must be non-null
void setf(@UnknownInitialization Super this) {
f = new Object();
}
Super() {
setf();
}
}
static class Sub extends Super {
Object f; // This shadows super.f
@Override
@EnsuresNonNull("f")
// We cannot ensure that Super.f is non-null since it is
// shadowed by Sub.f, hence we get an error.
// :: error: (contracts.postcondition.override.invalid)
void setf(@UnknownInitialization Sub this) {
f = new Object();
}
Sub() {
setf();
}
}
public static void main(String[] args) {
Super s = new Sub();
s.f.hashCode();
}
}
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