Fix invalid trait object slice example - #1232
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The Rust example uses `&[dyn Foo]`, which does not compile because trait objects (`dyn Foo`) are unsized and cannot be used directly as slice elements. Updated the function signature to use references to trait objects (`&[&dyn Foo]`), keeping the example behavior while making the snippet valid Rust.
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The Rust example uses
&[dyn Foo], which does not compile because trait objects (dyn Foo) are unsized and cannot be used directly as slice elements.Updated the function signature to use references to trait objects (
&[&dyn Foo]), keeping the example behavior while making the snippet valid Rust.