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Starting in Java 9, the resource in a try-with-resources statement can be a
reference to a `final` or effectively-`final` variable.
That is, you can write this:
```java
AutoCloseable resource = ...;
try (resource) {
doSomething(resource);
}
```
instead of this:
```java
AutoCloseable resource = ...;
try (AutoCloseable resource2 = resource) {
doSomething(resource2);
}
```
NOTE: the resource cannot be an arbitrary expression, for example `try
(returnsTheResources()) { ... }` is still not allowed.
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