java 17: anonymous classes with diamonds

[Anna Kozlova]

Hi all,

The following code doesn't compile with java 17 eap (java: foo.Boo.Nested
is abstract; cannot be instantiated)
```
public class Boo {

    static abstract class Nested<T> {
        protected Nested(Class<T> aAcceptedClass) { }

    }
    static class Outer<T>  {
        protected Outer(final Nested<T> condition) { }
    }

    static final Outer<Boo> PATTERN = new Outer<>(new
Nested<>(Boo.class) {}) {};
}

```
though the anonymous class is used.

At the same time, if I remove the anonymous class from outer call, like
`static final Outer<Boo> PATTERN = new Outer<>(new Nested<>(Boo.class) {});`
the code would compile.

If explicit types instead of diamonds are used, everything compiles fine as
well.

To me this looks like a bug in the compiler, could someone check this
please?

Thanks,
Anna
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