TestInfer.java

// Test case for issue #238: https://github.com/typetools/checker-framework/issues/238

import java.util.ArrayList;
import java.util.List;

class TestInfer {
    <T extends Object> T getValue(List<T> l) {
        return l.get(0);
    }

    void bar(Object o) {}

    void foo() {
        List<? extends Object> ls = new ArrayList<>();
        bar(getValue(ls)); // this fails, but just getValue(ls) is OK
        // casting is also OK, ie bar((Object)getValue(ls))
        // the constraint should be T<:Object, which should typecheck
        // since ls:List<? extends Object> unifies with List<T> where
        // T<:Object.
    }
}