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  1. JDK
  2. JDK-8029633

Raw inner class constructor ref should not perform diamond inference

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      Description

        See JDK-8029632 for a spec clarification: a constructor ref qualified by a raw type cannot perform diamond inference if that raw type is a non-static member of a raw type. Instead, it should be treated like a raw constructor invocation.

        class Outer<T> {
          class Inner1 {}
          class Inner2<U> {}

          // expected/actual: ok
          Supplier<Outer.Inner1> s1 = Outer.Inner1::new;
          // expected/actual: ok
          Supplier<Outer.Inner2> s2 = Outer.Inner2::new;
          // expected: unchecked conversion; actual: ok
          Supplier<Outer<T>.Inner1> s3 = Outer.Inner1::new;
          // expected: unchecked conversion; actual: inference error
          Supplier<Outer<T>.Inner2<String>> s4 = Outer.Inner2::new;
        }

        The inference error in the last case above makes it clear that javac is trying to perform diamond inference here.

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            backported by

            Backport - A issue that is required to port a Bug or Feature into another product release. This issue type is generally associated with the main Bug/Feature to represent each individual release of the port. JDK-8295757 Raw inner class constructor ref should not perform diamond inference

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • Resolved

            Backport - A issue that is required to port a Bug or Feature into another product release. This issue type is generally associated with the main Bug/Feature to represent each individual release of the port. JDK-8295758 Raw inner class constructor ref should not perform diamond inference

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • Resolved

            Backport - A issue that is required to port a Bug or Feature into another product release. This issue type is generally associated with the main Bug/Feature to represent each individual release of the port. JDK-8295759 Raw inner class constructor ref should not perform diamond inference

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • Resolved

            Backport - A issue that is required to port a Bug or Feature into another product release. This issue type is generally associated with the main Bug/Feature to represent each individual release of the port. JDK-8297049 Raw inner class constructor ref should not perform diamond inference

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • Resolved

            Backport - A issue that is required to port a Bug or Feature into another product release. This issue type is generally associated with the main Bug/Feature to represent each individual release of the port. JDK-8297248 Raw inner class constructor ref should not perform diamond inference

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • Resolved
            csr for

            CSR - null JDK-8292052 Raw inner class constructor ref should not perform diamond inference

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • Closed
            relates to

            Bug - A problem which impairs or prevents the functions of the product. JDK-8029632 Lambda Spec: Raw inner class constructor ref should not attempt diamond inference

            • P2 - Crashes, loss of data, severe memory leak.
            • Closed
            links to

            Commit Commit openjdk/jdk11u-dev/4ee685a9

            Commit Commit openjdk/jdk17u-dev/8ce7bb4e

            Commit Commit openjdk/jdk19u/ea145851

            Commit Commit openjdk/jdk/6707bfbc

            Review Review openjdk/jdk11u-dev/1523

            Review Review openjdk/jdk17u-dev/835

            Review Review openjdk/jdk19u/55

            Review Review openjdk/jdk/9784

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                vromero Vicente Arturo Romero Zaldivar
                dlsmith Dan Smith
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