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If a method's formal parameter is annotated with `@CompileTimeConstant`, the
method will always be invoked with an argument that is a static constant. If the
parameter itself is non-final, then it is a mutable reference to immutable data.
This is rarely useful, and can be confusing when trying to use the parameter in
a context that requires an compile-time constant. For example:
```java
void f(@CompileTimeConstant y) {}
void g(@CompileTimeConstant x) {
x = f(x); // x is not a constant
}
```
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