File: IndexForVarargs.java

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import org.checkerframework.checker.index.qual.IndexFor;

public class IndexForVarargs {
    String get(@IndexFor("#2") int i, String... varargs) {
        return varargs[i];
    }

    void method(@IndexFor("#2") int i, String[]... varargs) {}

    void m() {
        // :: error: (argument.type.incompatible)
        get(1);

        get(1, "a", "b");

        // :: error: (argument.type.incompatible)
        get(2, "abc");

        String[] stringArg1 = new String[] {"a", "b"};
        String[] stringArg2 = new String[] {"c", "d", "e"};
        String[] stringArg3 = new String[] {"a", "b", "c"};

        method(1, stringArg1, stringArg2);

        // :: error: (argument.type.incompatible)
        method(2, stringArg3);

        get(1, stringArg1);

        // :: error: (argument.type.incompatible)
        get(3, stringArg2);
    }
}