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This code does deliberate racy initialization of some memoized values,
and there is a static final instance of the `Space` subclass that ends
up being shared across multiple threads.

Tested: sponge/1777b644-2dd8-420b-ad06-b4f17c893d8f
PiperOrigin-RevId: 563181626

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Use `com.google.common.base.Supplier`, for compatibility with clients
that are using the Android version of Guava. Fixes e.g.

```
Exception in thread "main" java.lang.IncompatibleClassChangeError: Class com.google.common.base.Suppliers$NonSerializableMemoizingSupplier does not implement the requested interface java.util.function.Supplier
```

PiperOrigin-RevId: 563446857

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The start position of `final` variable is apparently after the token for
`final`, this works around that by inlining a call to `visitVariable` and
dropping the `sync` call that asserts the start position of the current
node matches the next token.

Fixes #959

PiperOrigin-RevId: 564710136

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