framework/tests/all-systems/java8inference/Issue1312.java

// Test case for Issue 1312.
// https://github.com/typetools/checker-framework/issues/1312

import java.util.*;
import java.util.function.*;
import java.util.stream.*;

class SimpleEntry1312<K, V> {
  SimpleEntry1312(K k, V v) {}
}

@SuppressWarnings("all") // check for crashes
public class Issue1312 {
  Map<SimpleEntry1312, List<SimpleEntry1312>> x =
      Stream.of(Stream.of(new SimpleEntry1312<>("A", "B")))
          .flatMap(Function.identity())
          .collect(Collectors.groupingBy(e -> e));
}