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+<p>
+ Functions and other definitions can be marked as deprecated using the
+ `@deprecated` attribute.
+</p>
+<p>
+ If a deprecated function is reference the compiler will emit a warning,
+ letting the programmer know they ought to update their code.
+</p>
+<p>
+ The deprecation atribute takes a message and this will be displayed to the
+ user in the warning. In the message explain to the user the new approach or
+ replacement function, or direct them on documentation on how to upgrade.
+</p>