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Bug
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Resolution: Fixed
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P3
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None
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Verified
Uses of a class like Inner, below, are not parameterized types (per JLS 4.5).
class Outer<T> {
abstract class Inner { abstract T get(); }
static <X> X unwrap(Outer<X>.Inner i) { return i.get(); }
static void test(Outer<String>.Inner i) {
unwrap(i).substring(3);
}
}
But, clearly, subtype inference should treat it just like a parameterized type. The rules in 18.2.3 should be modified to allow, e.g., x=String to be inferred above.
class Outer<T> {
abstract class Inner { abstract T get(); }
static <X> X unwrap(Outer<X>.Inner i) { return i.get(); }
static void test(Outer<String>.Inner i) {
unwrap(i).substring(3);
}
}
But, clearly, subtype inference should treat it just like a parameterized type. The rules in 18.2.3 should be modified to allow, e.g., x=String to be inferred above.
- relates to
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JDK-8030746 4.10: Define subtyping for inner classes of parameterized types
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- Open
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JDK-8029885 javac, fix subtype inference for a non-parameterized inner class of a generic type
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- Closed
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