LocalizedMessage.java

import org.checkerframework.checker.i18n.qual.Localized;

class LocalizedMessage {
    @Localized String localize(String s) {
        throw new RuntimeException();
    }

    void localized(@Localized String s) {}

    void any(String s) {}

    void stringLiteral() {
        //:: error: (argument.type.incompatible)
        localized("ldskjfldj"); // error
        any("lksjdflkjdf");
    }

    void stringRef(String ref) {
        //:: error: (argument.type.incompatible)
        localized(ref); // error
        any(ref);
    }

    void localizedRef(@Localized String ref) {
        localized(ref);
        any(ref);
    }

    void methodRet(String ref) {
        localized(localize(ref));
        localized(localize(ref));
    }

    void concatenation(@Localized String s1, String s2) {
        //:: error: (argument.type.incompatible)
        localized(s1 + s1); // error
        //:: error: (argument.type.incompatible) :: error: (compound.assignment.type.incompatible)
        localized(s1 += s1); // error
        //:: error: (argument.type.incompatible)
        localized(s1 + "m"); // error
        //:: error: (argument.type.incompatible)
        localized(s1 + s2); // error

        //:: error: (argument.type.incompatible)
        localized(s2 + s1); // error
        //:: error: (argument.type.incompatible)
        localized(s2 + "m"); // error
        //:: error: (argument.type.incompatible)
        localized(s2 + s2); // error

        any(s1 + s1);
        any(s1 + "m");
        any(s1 + s2);

        any(s2 + s1);
        any(s2 + "m");
        any(s2 + s2);
    }
}