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@@ -1268,7 +1268,9 @@ TABLE OF CONTENTS:
An impl expression chooses the implementation of the given trait
declaration for the given type. It is useful for refering to trait
- declarations in a generic context.
+ declarations in a generic context. It also allows you to
+ disambiguate a trait declaration whose type does not refer to the
+ trait parameter.
5.2.4. Cast Expressions: