spec clarification: wildcard array element signature

[Liam Miller-Cushon]

When javac compiles the following program, it writes field i's signature as
"LA<[*>.I;".

I don't think the grammar in JVMS 4.7.9.1 allows for the element type of an
array to be a wildcard. Is that a spec bug?

class A<X> { class I {} }
class Test {
  class B<Y> extends A<Y[]> {}
  B<?>.I i;
}
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