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+% Associated Types
+
+<small>There is a new edition of the book and this is an old link.</small>
+
+> Associated types are a way of associating a type placeholder with a trait such that the trait method definitions can use these placeholder types in their signatures.
+
+```rust
+pub trait Iterator {
+    type Item;
+    fn next(&mut self) -> Option<Self::Item>;
+}
+```
+
+---
+
+You can find the latest version of this information
+[here](ch19-03-advanced-traits.html#specifying-placeholder-types-in-trait-definitions-with-associated-types).
+\ No newline at end of file