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Each type parameter must be explicitly declared, in an\n angle-bracket-enclosed, comma-separated list following the function name.\n \n-```{.ignore}\n-fn iter<T, F>(seq: &[T], f: F) where T: Copy, F: Fn(T) {\n-    for elt in seq { f(*elt); }\n-}\n-fn map<T, U, F>(seq: &[T], f: F) -> Vec<U> where T: Copy, U: Copy, F: Fn(T) -> U {\n-    let mut acc = vec![];\n-    for elt in seq { acc.push(f(*elt)); }\n-    acc\n-}\n+```rust,ignore\n+// foo is generic over A and B\n+\n+fn foo<A, B>(x: A, y: B) 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