File: KeyForDiamond.java

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checker-framework-java 3.2.0%2Bds-3
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import java.util.*;
import org.checkerframework.checker.nullness.qual.KeyFor;

public class KeyForDiamond {
    private final Map<Integer, Double> map = new HashMap<>();

    public void method() {
        Map<@KeyFor("map") Integer, Double> paths = new HashMap<>();
        Set<@KeyFor("map") Integer> set = new HashSet<>();
        List<@KeyFor("map") Integer> list = new ArrayList<>();
    }

    public static void main(String[] args) {
        KeyForDiamond t = new KeyForDiamond();
    }
}