checker/tests/nullness/java8/lambda/ParametersInBodyGenerics.java

// Test that parameter annotations are correct in the body of a lambda

import java.util.List;
import org.checkerframework.checker.nullness.qual.*;

public class ParametersInBodyGenerics {
  interface NullableConsumer {
    void method(List<@Nullable String> s);
  }

  interface NonNullConsumer {
    void method(@NonNull List<String> s);
  }

  void test() {
    // :: error: (lambda.param)
    NullableConsumer fn0 = (List<String> i) -> i.get(0).toString();
    NullableConsumer fn2 =
        (List<@Nullable String> i) -> {
          // :: error: (dereference.of.nullable)
          i.get(0).toString();
        };
    NullableConsumer fn3 =
        // :: error: (lambda.param)
        (List<String> i) -> {
          i.get(0).toString();
        };
    NullableConsumer fn3b =
        (i) -> {
          // :: error: (dereference.of.nullable)
          i.get(0).toString();
        };

    NonNullConsumer fn4 =
        (List<String> i) -> {
          i.get(0).toString();
        };
    NonNullConsumer fn4b =
        (i) -> {
          i.get(0).toString();
        };
  }
}