RFR: 8369517: Compilation mismatch for equivalent lambda and method reference

[Vicente Romero]

Given the following test case:


import java.util.function.Supplier;
interface Main {
    interface X<T> {
        X<T> self();
    }

    static X<?> makeX() {return null;}

    static <R> X<R> create(Supplier<? extends R> supplier) {return null;}

    static X<X<?>> methodRef() {
        return create(Main::makeX).self();
    }

    static X<X<?>> lambda() {
        return create(() -> makeX()).self();
    }
}


javac reports an error for the method reference but not for the lambda. There should be no difference here (error in both cases)

-------------

Commit messages:
 - 8369517: Compilation mismatch for equivalent lambda and method reference

Changes: https://git.openjdk.org/jdk/pull/27737/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=27737&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8369517
  Stats: 53 lines in 3 files changed: 52 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/27737.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27737/head:pull/27737

PR: https://git.openjdk.org/jdk/pull/27737